Kinetic parameters of hydrogen reduction reaction in a 1 mol L−1 KОН.
\\n\\n
Released this past November, the list is based on data collected from the Web of Science and highlights some of the world’s most influential scientific minds by naming the researchers whose publications over the previous decade have included a high number of Highly Cited Papers placing them among the top 1% most-cited.
\\n\\nWe wish to congratulate all of the researchers named and especially our authors on this amazing accomplishment! We are happy and proud to share in their success!
\\n"}]',published:!0,mainMedia:null},components:[{type:"htmlEditorComponent",content:'IntechOpen is proud to announce that 179 of our authors have made the Clarivate™ Highly Cited Researchers List for 2020, ranking them among the top 1% most-cited.
\n\nThroughout the years, the list has named a total of 252 IntechOpen authors as Highly Cited. Of those researchers, 69 have been featured on the list multiple times.
\n\n\n\nReleased this past November, the list is based on data collected from the Web of Science and highlights some of the world’s most influential scientific minds by naming the researchers whose publications over the previous decade have included a high number of Highly Cited Papers placing them among the top 1% most-cited.
\n\nWe wish to congratulate all of the researchers named and especially our authors on this amazing accomplishment! We are happy and proud to share in their success!
\n'}],latestNews:[{slug:"stanford-university-identifies-top-2-scientists-over-1-000-are-intechopen-authors-and-editors-20210122",title:"Stanford University Identifies Top 2% Scientists, Over 1,000 are IntechOpen Authors and Editors"},{slug:"intechopen-authors-included-in-the-highly-cited-researchers-list-for-2020-20210121",title:"IntechOpen Authors Included in the Highly Cited Researchers List for 2020"},{slug:"intechopen-maintains-position-as-the-world-s-largest-oa-book-publisher-20201218",title:"IntechOpen Maintains Position as the World’s Largest OA Book Publisher"},{slug:"all-intechopen-books-available-on-perlego-20201215",title:"All IntechOpen Books Available on Perlego"},{slug:"oiv-awards-recognizes-intechopen-s-editors-20201127",title:"OIV Awards Recognizes IntechOpen's Editors"},{slug:"intechopen-joins-crossref-s-initiative-for-open-abstracts-i4oa-to-boost-the-discovery-of-research-20201005",title:"IntechOpen joins Crossref's Initiative for Open Abstracts (I4OA) to Boost the Discovery of Research"},{slug:"intechopen-hits-milestone-5-000-open-access-books-published-20200908",title:"IntechOpen hits milestone: 5,000 Open Access books published!"},{slug:"intechopen-books-hosted-on-the-mathworks-book-program-20200819",title:"IntechOpen Books Hosted on the MathWorks Book Program"}]},book:{item:{type:"book",id:"5236",leadTitle:null,fullTitle:"High Energy and Short Pulse Lasers",title:"High Energy and Short Pulse Lasers",subtitle:null,reviewType:"peer-reviewed",abstract:"This book gives the readers an introduction to experimental and theoretical knowledge acquired by large-scale laser laboratories that are dealing with extra–high peak power and ultrashort laser pulses for research of terawatt (TW), petawatt (PW), or near-future exawatt (EW) laser interactions, for soft X-ray sources, for acceleration of particles, or for generation of hot dense thermal plasma for the laser fusion. 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Laugeson",authors:[{id:"43405",title:"Dr",name:"Elizabeth",middleName:"A",surname:"Laugeson",fullName:"Elizabeth Laugeson",slug:"elizabeth-laugeson"},{id:"46932",title:"Mr.",name:"Steven",middleName:null,surname:"Kapp",fullName:"Steven Kapp",slug:"steven-kapp"},{id:"46933",title:"Dr.",name:"Alexander",middleName:null,surname:"Gantman",fullName:"Alexander Gantman",slug:"alexander-gantman"}]}]},relatedBooks:[{type:"book",id:"510",title:"Anxiety Disorders",subtitle:null,isOpenForSubmission:!1,hash:"183445801a9be3bfbce31fe9752ad3db",slug:"anxiety-disorders",bookSignature:"Vladimir Kalinin",coverURL:"https://cdn.intechopen.com/books/images_new/510.jpg",editedByType:"Edited by",editors:[{id:"31572",title:"Prof.",name:"Vladimir",surname:"Kalinin",slug:"vladimir-kalinin",fullName:"Vladimir Kalinin"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"},chapters:[{id:"17567",title:"A Probable Etiology and Pathomechanism of Arousal and Anxiety on Cellular Level - Is It the Key for Recovering from Exaggerated Anxiety?",slug:"a-probable-etiology-and-pathomechanism-of-arousal-and-anxiety-on-cellular-level-is-it-the-key-for-r1",signatures:"András Sikter and Roberto De Guevara",authors:[{id:"35166",title:"Dr",name:"András",middleName:null,surname:"Sikter",fullName:"András Sikter",slug:"andras-sikter"},{id:"47828",title:"Mr.",name:"Roberto",middleName:null,surname:"De Guevara",fullName:"Roberto De Guevara",slug:"roberto-de-guevara"}]},{id:"17568",title:"Relationship Between Oxidative Stress and Anxiety: Emerging Role of Antioxidants Within Therapeutic or Preventive Approaches",slug:"relationship-between-oxidative-stress-and-anxiety-emerging-role-of-antioxidants-within-therapeutic-1",signatures:"Jaouad Bouayed",authors:[{id:"34084",title:"Dr.",name:"Jaouad",middleName:null,surname:"Bouayed",fullName:"Jaouad Bouayed",slug:"jaouad-bouayed"}]},{id:"17569",title:"Pharmacology of 5-HT2 Modulation of Amygdala & Hypothalamus in Anxiety Disorders",slug:"pharmacology-of-5-ht2-modulation-of-amygdala-hypothalamus-in-anxiety-disorders1",signatures:"Xiaolong Jiang, Aiqin Chen, Stanley Smerin, Lei Zhang and He Li",authors:[{id:"30247",title:"Dr.",name:"Lei",middleName:null,surname:"Zhang",fullName:"Lei Zhang",slug:"lei-zhang"},{id:"40664",title:"Prof.",name:"He",middleName:null,surname:"Li",fullName:"He Li",slug:"he-li"},{id:"49431",title:"Dr.",name:"Xiaolong",middleName:null,surname:"Jiang",fullName:"Xiaolong Jiang",slug:"xiaolong-jiang"},{id:"49436",title:"Dr.",name:"Chen",middleName:null,surname:"Aiqin",fullName:"Chen Aiqin",slug:"chen-aiqin"},{id:"49438",title:"Dr.",name:"Stanley",middleName:null,surname:"Smerin",fullName:"Stanley Smerin",slug:"stanley-smerin"}]},{id:"17570",title:"Adenosine Signaling in Anxiety",slug:"adenosine-signaling-in-anxiety",signatures:"Christina L. Ruby, Chelsea A. Adams, David A. Mrazek and Doo-Sup Choi",authors:[{id:"34932",title:"Prof.",name:"Doo-Sup",middleName:null,surname:"Choi",fullName:"Doo-Sup Choi",slug:"doo-sup-choi"},{id:"49482",title:"Dr.",name:"Christina",middleName:null,surname:"Ruby",fullName:"Christina Ruby",slug:"christina-ruby"},{id:"86323",title:"Ms.",name:"Chelsea",middleName:null,surname:"Adams",fullName:"Chelsea Adams",slug:"chelsea-adams"},{id:"86324",title:"Dr.",name:"David",middleName:null,surname:"Mrazek",fullName:"David Mrazek",slug:"david-mrazek"}]},{id:"17571",title:"PTSD and Current Translational Research",slug:"ptsd-and-current-translational-research1",signatures:"Lei Zhang, Xian-Zhang Hu, Xiaoxia Li, He Li and Robert Ursano",authors:[{id:"30247",title:"Dr.",name:"Lei",middleName:null,surname:"Zhang",fullName:"Lei Zhang",slug:"lei-zhang"},{id:"40664",title:"Prof.",name:"He",middleName:null,surname:"Li",fullName:"He Li",slug:"he-li"},{id:"49337",title:"Dr.",name:"Xian-Zhang",middleName:null,surname:"Hu",fullName:"Xian-Zhang Hu",slug:"xian-zhang-hu"},{id:"94084",title:"BSc.",name:"Xiaoxia",middleName:null,surname:"Li",fullName:"Xiaoxia Li",slug:"xiaoxia-li"}]},{id:"17572",title:"Metabotropic Glutamate Receptors in Peripheral Tissues: Implications for Toxicology",slug:"metabotropic-glutamate-receptors-in-peripheral-tissues-implications-for-toxicology1",signatures:"Daniela Durand, Lila Carniglia, Carla Caruso and Mercedes Lasaga",authors:[{id:"36250",title:"Prof.",name:"Mercedes",middleName:null,surname:"Lasaga",fullName:"Mercedes Lasaga",slug:"mercedes-lasaga"},{id:"92295",title:"PhD.",name:"Carla",middleName:null,surname:"Caruso",fullName:"Carla Caruso",slug:"carla-caruso"},{id:"105060",title:"Dr.",name:"Daniela",middleName:null,surname:"Durand",fullName:"Daniela Durand",slug:"daniela-durand"},{id:"105062",title:"MSc.",name:"Lila",middleName:null,surname:"Carniglia",fullName:"Lila Carniglia",slug:"lila-carniglia"}]},{id:"17573",title:"The Carioca High and Low Conditioned Freezing Lines: A New Animal Model of Generalized Anxiety Disorder",slug:"the-carioca-high-and-low-conditioned-freezing-lines-a-new-animal-model-of-generalized-anxiety-disor1",signatures:"Vitor de Castro Gomes, Carlos Eduardo Barroso Silva and J. Landeira-Fernandez",authors:[{id:"52728",title:"Dr.",name:"J.",middleName:null,surname:"Landeira-Fernandez",fullName:"J. Landeira-Fernandez",slug:"j.-landeira-fernandez"},{id:"52733",title:"Dr.",name:"Vitor",middleName:null,surname:"Castro-Gomes",fullName:"Vitor Castro-Gomes",slug:"vitor-castro-gomes"},{id:"99781",title:"BSc.",name:"Carlos Eduardo",middleName:null,surname:"Silva",fullName:"Carlos Eduardo Silva",slug:"carlos-eduardo-silva"}]},{id:"17574",title:"The Loss of Glutamate-GABA Harmony in Anxiety Disorders",slug:"the-loss-of-glutamate-gaba-harmony-in-anxiety-disorders",signatures:"Joanna M Wierońska, K. Stachowicz, G. Nowak and A. Pilc",authors:[{id:"36779",title:"Prof.",name:"Andrzej",middleName:null,surname:"Pilc",fullName:"Andrzej Pilc",slug:"andrzej-pilc"},{id:"36785",title:"Dr.",name:"Joanna",middleName:null,surname:"Wieronska",fullName:"Joanna Wieronska",slug:"joanna-wieronska"},{id:"36786",title:"Mr.",name:"Katarzyna",middleName:null,surname:"Stachowicz",fullName:"Katarzyna Stachowicz",slug:"katarzyna-stachowicz"}]},{id:"17575",title:"Role of the Endocannabinoid System in Anxiety and Stress-Related Disorders",slug:"role-of-the-endocannabinoid-system-in-anxiety-and-stress-related-disorders1",signatures:"Irit Akirav",authors:[{id:"31398",title:"Dr.",name:"Irit",middleName:null,surname:"Akirav",fullName:"Irit Akirav",slug:"irit-akirav"}]},{id:"17576",title:"New Anxiolytic Phytopharmaceutical Elaborated with the Standardized Extract of Galphimia glauca",slug:"new-anxiolytic-phytopharmaceutical-elaborated-with-the-standardized-extract-of-galphimia-glauca1",signatures:"Jaime Tortoriello, Armando Herrera-Arellano, Maribel Lucila Herrera-Ruiz, Alejandro Zamilpa, Manases González-Cortazar and Jesús Enrique Jiménez-Ferrer",authors:[{id:"56540",title:"Dr.",name:"Jaime",middleName:null,surname:"Tortoriello",fullName:"Jaime Tortoriello",slug:"jaime-tortoriello"},{id:"57576",title:"Dr.",name:"Armando",middleName:null,surname:"Herrera-Arellano",fullName:"Armando Herrera-Arellano",slug:"armando-herrera-arellano"},{id:"57577",title:"Dr.",name:"Maribel L.",middleName:null,surname:"Herrera-Ruiz",fullName:"Maribel L. Herrera-Ruiz",slug:"maribel-l.-herrera-ruiz"},{id:"57578",title:"Dr.",name:"Alejandro",middleName:null,surname:"Zamilpa",fullName:"Alejandro Zamilpa",slug:"alejandro-zamilpa"},{id:"57579",title:"Dr.",name:"Manases",middleName:null,surname:"González-Cortazar",fullName:"Manases González-Cortazar",slug:"manases-gonzalez-cortazar"},{id:"57580",title:"Dr.",name:"Jesús Enrique",middleName:null,surname:"Jiménez-Ferrer",fullName:"Jesús Enrique Jiménez-Ferrer",slug:"jesus-enrique-jimenez-ferrer"}]},{id:"17577",title:"Psychophysiological Markers of Anxiety Disorders and Anxiety Symptoms",slug:"psychophysiological-markers-of-anxiety-disorders-and-anxiety-symptoms",signatures:"Seung-Hwan Lee and Gewn-Hi Park",authors:[{id:"37658",title:"Prof.",name:"Seung-Hwan",middleName:null,surname:"Lee",fullName:"Seung-Hwan Lee",slug:"seung-hwan-lee"},{id:"37669",title:"Dr.",name:"Gewn Hi",middleName:null,surname:"Park",fullName:"Gewn Hi Park",slug:"gewn-hi-park"}]},{id:"17578",title:"Comorbidity of Anxiety and Affective Disorders as Neuropsychiatric and Evolutionary Problem (A New Concept)",slug:"comorbidity-of-anxiety-and-affective-disorders-as-neuropsychiatric-and-evolutionary-problem-a-new-co",signatures:"Vladimir V. Kalinin",authors:[{id:"31572",title:"Prof.",name:"Vladimir",middleName:null,surname:"Kalinin",fullName:"Vladimir Kalinin",slug:"vladimir-kalinin"}]},{id:"17579",title:"Pharmacological Resistance of Stress Enhanced Fear Learning in an Animal Model of Post-Traumatic Stress Disorder",slug:"pharmacological-resistance-of-stress-enhanced-fear-learning-in-an-animal-model-of-post-traumatic-st1",signatures:"Virginia Long, Wendy Fujioka, Dorsa Amir and Michael Fanselow",authors:[{id:"57462",title:"Prof.",name:"Michael",middleName:null,surname:"Fanselow",fullName:"Michael Fanselow",slug:"michael-fanselow"},{id:"58046",title:"Dr.",name:"Virginia",middleName:null,surname:"Long",fullName:"Virginia Long",slug:"virginia-long"},{id:"91804",title:"Ms.",name:"Wendy",middleName:null,surname:"Fujioka",fullName:"Wendy Fujioka",slug:"wendy-fujioka"},{id:"91805",title:"Ms.",name:"Dorsa",middleName:null,surname:"Amir",fullName:"Dorsa Amir",slug:"dorsa-amir"}]},{id:"17580",title:"Anxiety Disorders in Dogs",slug:"anxiety-disorders-in-dogs1",signatures:"Miguel Ibáñez Talegón and Bernadette Anzola Delgado",authors:[{id:"50767",title:"Dr.",name:"Miguel",middleName:null,surname:"Ibanez",fullName:"Miguel Ibanez",slug:"miguel-ibanez"},{id:"97383",title:"Prof.",name:"Bernadette",middleName:null,surname:"Anzola Delgado",fullName:"Bernadette Anzola Delgado",slug:"bernadette-anzola-delgado"}]},{id:"17581",title:"MicroRNA-Mediated Regulation and the Genetic Susceptibility to Anxiety Disorders",slug:"microrna-mediated-regulation-and-the-genetic-susceptibility-to-anxiety-disorders1",signatures:"Yolanda Espinosa-Parrilla and Margarita Muiños-Gimeno",authors:[{id:"44367",title:"Dr.",name:"Yolanda",middleName:null,surname:"Espinosa-Parrilla",fullName:"Yolanda Espinosa-Parrilla",slug:"yolanda-espinosa-parrilla"},{id:"48054",title:"Dr.",name:"Margarita",middleName:null,surname:"Muiños-Gimeno",fullName:"Margarita Muiños-Gimeno",slug:"margarita-muinos-gimeno"}]},{id:"17582",title:"Neurosteroid Biosynthesis Upregulation: A Novel Promising Therapy for Anxiety Disorders and PTSD",slug:"neurosteroid-biosynthesis-upregulation-a-novel-promising-therapy-for-anxiety-disorders-and-ptsd",signatures:"Graziano Pinna",authors:[{id:"31585",title:"Prof.",name:"Graziano",middleName:null,surname:"Pinna",fullName:"Graziano Pinna",slug:"graziano-pinna"}]}]}]},onlineFirst:{chapter:{type:"chapter",id:"62641",title:"Electrocatalytic Properties of Molybdenum and Tungsten Alloys in the Hydrogen Evolution Reaction",doi:"10.5772/intechopen.79058",slug:"electrocatalytic-properties-of-molybdenum-and-tungsten-alloys-in-the-hydrogen-evolution-reaction",body:'\nThe amount of energy consumed in the world has been steadily increasing in the recent decades, and the nonrenewable fossil energy sources account for over 80% of it [1]. In view of this, the search for efficient, environmentally appropriate methods for the generation of renewable energy is a vital present-day scientific problem [2]. One such promising trends is fuel cells [3, 4], the operation of which is directly bound up with the availability of high-purity hydrogen.
\nAt the present time, the wide use of pure hydrogen is economically inexpedient in comparison, e.g., with the use of natural gas, because of the high cost of its production. The industrial method for hydrogen production by the electrolysis of alkaline aqueous solutions [5] has a number of disadvantages, such as the large expenditure of energy, low efficiency of the process, and the necessity of using noble metals as catalysts. Low carbon steel, which is corrosion-nonresistant in alkaline medium, and nickel also possess a catalytic effect in the hydrogen evolution reaction [6]; nevertheless, the problem of search for electrode materials with lower hydrogen evolution overpotential and high corrosion resistance remains vital. For instance, platinum group catalysts can be replaced by cheaper materials, such as nickel, molybdenum, and iron-chromium and iron-manganese alloys, in electrolysis in ionic liquids [7]. However, if the high cost of ionic liquids themselves is taken into account, there is no considerable reduction in the cost of materials for pure hydrogen production.
\nIn the general form, the hydrogen electroreduction process in an alkaline medium is described by the Volmer (1)—Heyrovsky (2)—Tafel (3) mechanism with the following stages:
\nThe rate of electrocatalytic reaction depends on the energy of adsorbed species, i.e., on the energy of hydrogen atoms. The plot of the exchange current density of hydrogen evolution reaction against hydrogen-metal bond energy passes through a maximum and has a volcano-like shape (Figure 1).
\nDependence of the exchange current density of hydrogen evolution reaction in acid solutions against hydrogen-metal bond energy. Reprinted with permission from Ref. [8].
At low Ме▬Н bond energy, the process is controlled by the discharge step, reaction (1). At very high Ме▬Н bond energy, the process is controlled by the electrochemical desorption step, reaction (2). On nickel, cobalt, and iron, the rate-determining step changes from reaction (1) to (2) with increasing polarization. Thus, the most important parameter that determines electrocatalytic activity is the energy of bonding of adsorbed species to the catalyst [9]. When catalysts consisting of two metals are used, the formation of several alloy types, such as mechanical mixtures, solid solutions, and intermetallics is possible. From an analysis of the mechanism of electrocatalytic processes, metal-metal bond energy, and the properties of different alloy types, the authors of [9] conclude that the alloys formed by the metals that are on the different branches of the volcano plot and especially the alloys formed by d-metals with unoccupied d-orbitals (of groups IV–VI) and d-metals of group VIII with a large number of filled d-orbitals possess electrocatalytic activity.
\nIt is known from literature that transition-metal alloys, viz. alloys of iron subgroup metals with molybdenum and tungsten, which show electrocatalytic properties with respect to hydrogen reduction reaction both in acidic [10, 11, 12, 13] and in alkaline aqueous solutions [14, 15, 16, 17], meet these requirements, and that the use of the electrochemical method for the deposition of thin alloy coatings makes it possible to reduce the cost of electrode materials and hence the cost of produced hydrogen.
\nThe synergetic action of alloys in comparison with individual metals is explained by researchers not only by the type of formed alloy and its chemical composition but also by the difference in the mechanism of hydrogen electroreduction on the metals, as well as by the phenomenon of interfacial diffusion of adsorbed hydrogen, hydrogen spillover. The authors of [18] showed the frequent occurrence of this phenomenon in various catalytic processes and catalyst types. Spillover is called the transport of active species, sorbed or formed on one phase, to another phase, which does not sorb and form these species. A study of the synergetic effect of alloys of cobalt and nickel with molybdenum and tungsten with allowance for hydrogen spillover was carried out in [19] for hydrodesulphurization reaction as an example, and it was suggested that different process stages occur on different catalyst phases, between which hydrogen spillover takes place. The spillover phenomenon is of great practical importance, the study of which will help to design new multiphase catalysts, where the catalytic reaction takes place by interfacial diffusion.
\nAs applied to the alloys of molybdenum and tungsten with iron group metals, the spillover phenomenon can account for the synergetic effect of these alloys, in the case of which the discharge step on Mo(W) takes place quickly, and on Co(Ni, Fe), the electrochemical desorption step is fast. Thus, in order that this mechanism may be effected, the active centers of different nature must be at the distance from one another that makes possible the surface diffusion of hydrogen adatoms, and hence the alloy must be a solid solution or an intermetallic.
\nNickel is the most commonly used cathode material in electrolyzers for hydrogen production [20] due to its catalytic properties, corrosion resistance in alkaline medium, and low cost. A possible way of intensifying the process and improving the required properties is electrode surface modification by molybdenum and tungsten alloys; therefore, many papers are devoted to the study of the electrodeposition and catalytic activity of NiMo and NiW alloys. For instance, the authors of [21] studied the electrodeposition of a NiMo alloy on a copper and a nickel substrate from a citrate electrolyte with рН 9.5 and a concentration ratio of the metals of 1/12. The best catalytic activity was found for a coating containing 41 wt.% molybdenum, and it was shown that the hydrogen evolution overpotential at the obtained alloy is lower compared with pure nickel in the model 1 М NaOH solution. In the study [22], a citrate electrolyte with рН 6.0 was also used, and it was shown that it is possible to deposit an alloy containing 28.5 аt.% Мо, which reduces the hydrogen evolution overpotential in 8 M NaOH at 90°С from 122 to 21 mV·dec-1 relative to nickel. The authors of [23] found that when a SAS is added to a citrate-ammonia electrolyte for deposition, nanocrystalline coatings having catalytic activity at a molybdenum content of 19.59 аt.% can be obtained. Chialvo and co-authors [24] studied the catalytic activity of thermal NiMo alloys as a function of the amount of molybdenum (0–25 аt.%) and showed that the higher the Мо content, the lower the hydrogen overpotential. From an analysis of literature data, it can be concluded that there is no unambiguous dependence of electrocatalytic activity on the chemical composition of the coating; for each particular deposition electrolyte, activity is proportional to the molybdenum content, but from the comparison of a large number of papers, it becomes clear that the determining factor is electrolysis conditions, which determine the morphology, the true surface area, the presence of cracks, or an oxide phase on the alloy surface. Therefore, the catalytic properties of electrocatalytic alloys are determined experimentally in each particular case.
\nOn the basis of investigations carried out by the authors of [25], it was concluded that molybdenum-bearing alloys are more active in the hydrogen evolution reaction in alkaline medium than tungsten-bearing alloys. When investigating the properties of Ni-Mo, Ni-W, Co-Mo, and Co-W alloys, it was also found that cobalt alloys show a higher catalytic activity than nickel alloys.
\nThe main characteristics of electrocatalytic activity in HER are reaction exchange current and hydrogen reduction overpotential. Therefore, the main method for studying this process is voltammetry.
\nIn the study [26], an investigation on the electrocatalytic properties of Co-W alloys electrodeposited from a polyligand citrate-pyrophosphate electrolyte had been carried out. The coatings were deposited in a solution containing 0.1 mol L−1 of CoSO4, 0.2 mol L−1 of Na2WO4, 0.2 mol L−1 of Na3Cit (where Cit—citrate ions), 0.2 mol L−1 of K4P2O7, 0.5 mol L−1 of Na2SO4 and in solutions containing SASs: 2 mL L−1 of water-soluble resin neonol, whose efficiency was shown when electrodepositing Co-W alloys from a citrate-ammonia electrolyte [27], and 1.5 g L−1 and 4.5 g L−1 of a nonionic SAS, OP-10 emulsifier. All experiments were performed under forced convection conditions in a current density range of 5.0–30.0 mА сm−2 at 50°С and electrolyte рН 8.5.
\nIt can be seen from Figure 2 that the composition of the coatings deposited from a citrate-pyrophosphate electrolyte is constant regardless of deposition current density and addition of SASs. All coatings containing on an average 22 аt.% W, nevertheless, differ in the current efficiency of their deposition and in the morphology of the produced surface. A small increase in current efficiency for alloys is observed in the case of adding a SAS (neonol or OP-10) to the electrolyte. For instance, at 5.0 mА сm−2 in the presence of neonol, the current efficiency reaches 68%, and a compact, bright, adherent coating is formed. The addition of OP-10 has a noticeable effect only at a concentration of 4.5 g L−1.
\nDependence of the composition (a) and current efficiency (b) of Co-W alloys obtained from electrolyte: 1—without additives; 2—neonol; and 3 and 4—OP-10 (1.5 and 4.5 g L−1) on the deposition current density.
The addition of SASs to the electrolyte and deposition current density affects greatly the quality and morphology (Figure 3). For instance, in the electrolyte without additives at a current density of 5.0 mА сm−2, compact bright coatings are deposited. When the current density is increased to 10.0 mА сm−2, the coating becomes more stressed, and microcracks appear, and at 30.0 mА сm−2, the formation of spherulites is observed. The addition of neonol makes it possible to obtain high-quality fine-crystalline deposits in a wider current density range, and the addition OP-10, on the contrary, facilitates the formation of spherulites and favors surface development.
\nMicrophotographs of the surface of alloys obtained from electrolytes (a) without additives and (b) neonol at a current density of 10.0 mА сm−2 and (c) OP-10 at 30.0 mА сm−2.
The electrocatalytic properties of СоW coatings in the hydrogen reduction reaction were investigated by stationary voltammetry in 1.0 and 6.0 mol L−1 KОН solutions because KOH is used in industrial water electrolysis, and under experimental conditions, i.e., at room temperature, the solution has a maximum electrical conductivity at 28 wt.% KОН.
\nFigure 4a shows a considerable decrease in hydrogen overpotential on CoW alloys relative to electrolytic cobalt. For instance, at the current density of 30.0 mА сm−2, the overpotential decreases by 360 mV. As one would expect, a higher electrocatalytic activity is observed for the coating with more developed surface with spherulites morphology.
\n(a) Volt-ampere curves for the electroreduction of hydrogen in a solution of 1.0 mol L−1 KOH on cobalt (1) and CoW alloys (2 and 3) electrodeposited from the electrolyte without additives at 10.0 and 20.0 mA cm−2, respectively. (b) Volt-ampere curves for the electroreduction of hydrogen in 6.0 mol L−1 KOH solution on CoW alloys, obtained from electrolytes: 1—without additives; 2—neonol; and 3 and 4—OP-10 (1.5 and 4.5 g L−1) at a current density of 10.0 mA cm−2.
Figure 4b shows the effect of SASs added to an electrolyte for the deposition of CoW alloys on their electrocatalytic properties in a solution analogous to industrial electrolyte for hydrogen production. It can be seen that in this particular case, the addition of SAS rather has adverse effects, i.e., smoothing the surface during electrodeposition improves the mechanical and corrosive properties of the coating, but reduces its true surface area.
\nIn the study [28], cobalt and Со-Мо alloys were deposited from a citrate-pyrophosphate electrolyte, proposed earlier [29], with the different concentration ratio of the metals in the solution: [Co]:[Mo] = 20:1; 10:1: 5:1; 1:1 in a current density range of 10–100 mА сm−2 at 50°С. The studies of hydrogen electroreduction on Со-Мо alloys were carried out in solutions with different mineralization and рН, viz. 0.01 mol L−1 H2SO4; 0.5 mol L−1 Na2SO4; and 1.0 mol L−1 KOH. The voltammetric measurements for the determination of the kinetic parameters of hydrogen reduction were made at 25°С. The current-potential curves were recorded under potentiostatic conditions with a step of 20 mV. Before each experiment, argon was passed through the solution for 30 min.
\nIn order to show clearly the catalytic effect of the alloy in comparison with an individual metal, current-potential curves of hydrogen reduction on pure cobalt deposited from a citrate-pyrophosphate electrolyte at a current density of 30 mА сm−2 and a temperature of 50°С have been obtained.
\nFigure 5 shows current-potential curves of hydrogen electroreduction in an acidic, an alkaline, and a neutral medium on electrolytic cobalt cathodes and cathodes made of Со-Мо alloys electrodeposited at the same current density and temperature.
\nStationary current-potential curves of the electroreduction of hydrogen evolution on electrolytic cobalt (a) and Co-Mo alloys (b) with the ratio [Mo]/[Mo] + [Co] = 0.33 electrodeposited at the current density 30 mA cm−2, in media with different pH: 1—H2SO4, 2—KOH, and 3—Na2SO4.
Because of differences in electroreduction mechanism at different pH values, the lowest hydrogen evolution overpotential on cobalt is observed in an acidic medium and the highest in a neutral medium, as is the case with the dependence obtained for a mercury electrode and described in [30]. In the case of cobalt cathode, the coefficient b of the Tafel portion of the polarization curve for the acidic, alkaline, and neutral media was 0.122, 0.142, and 0.125 V, and the exchange current density was 1.93, 4.59 × 10−2 and 6.31 × 10−3 mА сm−2, respectively.
\nFigure 5 shows a considerable decrease in hydrogen evolution overpotential on the alloy. For instance, at the current density of 10 mА сm−2, the overpotential value in the alkaline medium is lower by over 200 mV.
\nThe plots shown in Figure 6 have been obtained on alloys electrodeposited at different current densities of 10–100 mА сm−2. The abscissa of the figure gives the ratio of the amounts of the metals in the alloy, and not the exact percentage because of the peculiarities of EDX analysis, in which the coating surface layer, on which a large amount of oxygen and carbon are adsorbed. The adsorbed light elements can be removed by polishing the surface or treating it with argon ions. Both in this and in the initial case, the ratio of the metals in the alloy remains constant, as was shown in [17], with a coating depth of up to 100 nm. Thus, the ratio of molybdenum and cobalt in the surface layer, determined by EDX analysis, corresponds to the volumetric chemical composition of the alloy.
\nDependence of the exchange current densities of the hydrogen electroreduction reaction on the ratio of molybdenum to cobalt in alloys electrodeposited at current densities of 10, 30, and 100 mA cm−2 from the solution with a [Co]:[Mo] ratio of 1:1 in various media: 1—H2SO4, 2—KOH, and 3—Na2SO4.
In the alloys deposited from an electrolyte with the concentration ratio [Co]:[Mo] = 1:1, the amount of molybdenum decreases and the exchange current density of the hydrogen reduction reaction increases with increasing deposition current density, which can be accounted for in terms of the value which the surface morphology and the true electrode area have, as was shown in [17]. Figure 7 shows surface micrographs of alloys electrodeposited at two current densities of 10 and 100 mА сm−2. It can be seen that at a low current density, smooth, fine-crystalline, and bright coatings are deposited in spite of the presence of microcracks. Increasing the deposition current density to 100 mА сm−2 results in the formation of spherulites and considerable surface development. This regularity is observed for all investigated solutions.
\nThe morphology of Co-Mo alloys precipitated from electrolytes [Co]:[Mo] = 1:1 (a and b) and [Co]:[Mo] = 5:1 (c and d) at current densities of: a and c—10 mA cm−2; b and d—100 mA cm−2 and the ratio of metals [Mo]/[Mo] + [Co] equal to 0.39, 0.27, 0.28, and 0.21, respectively.
The conclusion that the electrocatalytic activity decreases with increasing refractory metal content may contradict papers, published earlier, on the properties of Co-Mo coatings [17, 14]. However, attention should be called on how the coating composition was changed. There are several ways of influencing the chemical composition of alloys, viz. changing the electrolyte composition and pH, temperature, current density, hydrodynamic regime, etc. For instance, in the study [14], a change in alloy composition is achieved by changing both deposition current density and electrolyte composition and in the study [17], by changing pH and, hence, the concentration ratio of different complex species that are able to be discharged to form an alloy. Thus, it is impossible to obtain a rigorous dependence of catalytic activity on the composition of coating deposited under different conditions, because the electrolysis conditions influence not only chemical but also phase composition, which in turn influences the properties of the alloy as a whole.
\nThe effect of change in the composition of the solution for alloy electrodeposition on the electrocatalytic properties is clearly seen in Figure 8, which shows current-potential curves of hydrogen electroreduction on cobalt and alloys deposited at a current density of 30 mА сm−2 from electrolytes containing different sodium molybdate concentrations. It is seen from the figure that the highest hydrogen evolution overpotential is observed on cobalt deposits and the lowest on the alloy deposited from the electrolyte with [Co]:[Mo] = 10:1. The kinetic parameters of hydrogen electroreduction in an alkaline medium are presented in Table 1.
\nPolarization curves obtained in KOH solution on cobalt (1) and Co-Mo alloys with the ratio of metals [Mo]/[Mo]+[Co] equal to (2)—0.11, (3)—0.19, (4)—0.23, and (5)—0.33, respectively, electrodeposited at 30 mA∙cm−2 from electrolytes [Co]:[Mo] = 20:1, 10:1, 5:1, 1:1, respectively.
Electrolyte | \njdep. (mА сm−2) | \nЕ0 (V) | \nа | \nb | \nj0 (mА сm−2) | \n[Мо]/([Мо] + [Со])* | \n
---|---|---|---|---|---|---|
Co | \n30 | \n−0.821 | \n0.190 | \n0.142 | \n4.59 × 10−2 | \n— | \n
[Co]:[Mo] = 20:1 | \n10 | \n−0.910 | \n0.181 | \n0.134 | \n4.46 × 10−2 | \n0.22 | \n
30 | \n−0.985 | \n0.038 | \n0.077 | \n3.21 × 10−1 | \n0.11 | \n|
[Co]:[Mo] = 10:1 | \n10 | \n−0.940 | \n0.125 | \n0.091 | \n9.23 × 10−2 | \n0.25 | \n
20 | \n−1.005 | \n0.045 | \n0.058 | \n1.67 × 10−1 | \n0.23 | \n|
30 | \n−1.025 | \n0.025 | \n0.056 | \n3.58 × 10−1 | \n0.19 | \n|
[Co]:[Mo] = 5:1 | \n10 | \n−0.920 | \n0.130 | \n0.155 | \n1.25 × 10−1 | \n0.28 | \n
30 | \n−0.980 | \n0.050 | \n0.062 | \n1.56 × 10−1 | \n0.23 | \n|
100 | \n−1.000 | \n0.035 | \n0.053 | \n2.19 × 10−1 | \n0.21 | \n|
[Co]:[Mo] = 1:1 | \n10 | \n−0.900 | \n0.189 | \n0.146 | \n5.08 × 10−2 | \n0.39 | \n
20 | \n−0.935 | \n0.110 | \n0.089 | \n5.81 × 10−2 | \n0.37 | \n|
30 | \n−0.980 | \n0.083 | \n0.080 | \n9.17 × 10−2 | \n0.33 | \n|
40 | \n−0.965 | \n0.069 | \n0.077 | \n1.27 × 10−1 | \n0.30 | \n|
100 | \n−1.010 | \n0.043 | \n0.068 | \n2.33 × 10−1 | \n0.27 | \n
Kinetic parameters of hydrogen reduction reaction in a 1 mol L−1 KОН.
The ratio of the metals was calculated based on their atomic fraction in alloys.
Here, jdep. is the current density of alloy deposition; Е0 is the stationary potential of the alloy in a КОН solution; а and b are coefficients in the Tafel equation; and j0 is hydrogen exchange current density.
The difference in the value of hydrogen exchange current on alloys with the same chemical composition is seen in Figure 9.
\nThe dependence of the exchange current of the hydrogen reduction in a 1.0 mol L−1 KOH solution (1 and 2) and the current efficiency (3 and 4) of the Co-Mo alloys electrodeposited in the electrolytes [Co]:[Mo] = 5:1 and [Co]:[Mo] = 1:1 on the ratio of metals in the alloy.
In Figure 9, attention should be called on how the current efficiency of the deposition of the alloy and its electrocatalytic activity correlate with each other. In spite of the fact that the current efficiency was measured for a citrate-pyrophosphate electrolyte for deposition, this electrolyte is a weakly alkaline salt solutions, in which the alloys that are formed also exhibit electrocatalytic activity against the parallel cathodes process, with hydrogen electroreduction; therefore, the plots shown in Figure 9 are of antibate character. Therefore, alloys, electrodeposited at high current densities up to 100 mA cm−2 and having the highest catalytic activity (for all deposition electrolytes) are deposited with the lowest current efficiency.
\nFrom the obtained data, it can be concluded that in the case of Со-Мо alloys electrodeposited from citrate-pyrophosphate electrolytes, the hydrogen exchange current decreases for each particular electrolyte with increasing amount of molybdenum in the alloy. However, in a series of electrolytes with the different concentration ratio of the discharging metals, the alloys that differ greatly in chemical composition can have the same electrocatalytic activity; this can be seen in Figure 10, which shows values of hydrogen exchange currents and stationary potentials for alloys deposited at the same current density, but from different electrolytes.
\nThe dependence of the exchange current (1 and 2) and the stationary potential (3 and 4) in the KOH solution on the molybdenum and cobalt ratio in alloys deposited at current densities, mА cm−2. 1: 3—30; and 2: 4—10.
An extreme form is typical both of the plots of hydrogen exchange current density vs. the ratio of the alloy components and of the stationary potential values of the alloy in the КОН solution.
\nThus, the optimal electrolyte for the making of electrocatalytic Со-Мо alloys is the electrolyte with a cobalt and molybdenum concentration ratio of 10:1, which occupies an intermediate position in the series of investigated solutions; so, increasing or decreasing the concentration of sodium molybdate and hence of molybdenum in the alloy results in the deterioration of the catalytic properties of the coating.
\nIt is known [10] that the electrocatalytic activity of electrode material can be increased by several ways, e.g., by increasing the true working surface area of the catalyst, viz. by making the catalyst not in the form of a continuous film, but in the form of nanofibers [31]. The true surface area must be estimated when fabricating continuous alloy coatings, as this was done in [17]; it should be noted, however, that the factor of surface development is not determining in the ascertainment of the causes of the electrocatalytic activity of the materials under investigation. Another important factor is the nature of the metals comprising the alloy, which was shown in [25], but the physicochemical properties of one metal do not account for the synergetic effect in the use of alloys. The phenomenon that describes most reliably the synergetic action of two or more metals is spillover effect, which was described in [10, 11, 12]. Since hydrogen evolution occurs on Со and Мо with different rate-determining steps, as was said above, the occurrence of hydrogen spillover makes it possible to bring about a fact reaction (1) on molybdenum atoms and a rapid electrochemical desorption (2) on cobalt atoms.
\nBecause of this, the synergetic effect of the alloy will manifest itself when the atoms are arranged in an optimal manner to perform sequential reaction steps. This is possible when the alloy is an intermetallic, an amorphous phase, or solid solutions with nanosized crystals.
\nWhen we attempted to investigate the coatings obtained by us by X-ray phase analysis, we have not obtained somewhat well-defined peaks of phases, i.e., the coatings were either very fine-crystalline, below the device sensitivity level, or amorphous. However, different properties (e.g., corrosion or magnetic properties) of Co-Mo alloys of the same composition have also been obtained by us earlier. Their phase composition has been studied by us by stripping analysis and shown in [32].
\nSome of the main characteristics of modern catalytic materials are not only their activity in the desired reaction but also mechanical strength and corrosion resistance in aggressive media; therefore, the comprehensive investigation of the physicochemical properties of the electrode material is an important scientific and technical problem.
\nIn the study [26], the corrosion characteristics of electrolytic Co-W alloys deposited from a citrate-pyrophosphate electrolyte in 3.5% NaCl and 6 mol L−1 KOH solutions at 25°С have been determined by EIS and stationary voltammetry (Figure 11).
\nElectrochemical impedance spectra (a) and current-potential curves (b) obtained in the case of corrosion of coatings electrodeposited from a citrate-pyrophosphate electrolyte at the current densities mА cm−2: 1—5.0; 2—10.0; and 3—20.0.
The impedance hodographs obtained at a stationary potential in a corrosive medium can be described by a circuit comprising the ohmic resistance of the solution, charge transfer (corrosion) resistance, and a constant phase element. The corrosion parameters calculated in accordance with this equivalent circuit are listedTable 2.
\n\n | j (mА сm−2) | \nW (аt.%) | \nR (kОhm сm−2) | \nRp (kОhm сm−2) | \nЕcorr (V) | \nJcorr × 105 (А сm−2) | \n
---|---|---|---|---|---|---|
1 | \n5.0 | \n23.3 | \n18.0 | \n41.2 | \n−0.782 | \n1.35 | \n
2 | \n10.0 | \n24.0 | \n18.8 | \n6.9 | \n−0.834 | \n8.53 | \n
3 | \n20.0 | \n20.8 | \n12.8 | \n16.6 | \n−0.786 | \n5.24 | \n
Corrosion parameters of alloys in a 3.5% NaCl solution.
Here, j is alloy deposition current density; W is tungsten content, аt.%; R is corrosion resistance determined by the impedance method; Rp is corrosion resistance determined by voltammetry; Еcorr is corrosion potential; and jcorr is corrosion current density.
The coating deposited at a current density of 5.0 mА сm−2 has the highest corrosion stability because in the region of kinetic control of electrochemical reaction, most fine-crystalline and compact deposits are formed. Since the chemical composition of the coatings deposited from a citrate-pyrophosphate electrolyte is almost constant, the dependence of polarization resistance on deposition current density can be attributed to a difference in surface morphology and the appearance of microcracks on increasing the deposition current. On the whole, the corrosion rate of the obtained alloys is comparable with that in an analogous solution of electrolytic chromium deposited from Cr(III) and Cr(VI) baths in the study [33] (Figure 12).
\nSpectra of electrochemical impedance (a) and current-potential curves (b), obtained in the case of corrosion in a 6.0 mol L−1 KOH solution, for coatings electrodeposited at a current density of 10.0 mA cm−2 from electrolytes 1—no additives; 2—neonol; 3 and 4—OP-10 (1.5 and 4.5 g L−1).
The parameters of the corrosion process, determined by the electrochemical impedance method, have been calculated on the basis of an equivalent circuit comprising the ohmic resistance of the solution, corrosion resistance, a constant phase element, and Warburg impedance (Table 3).
\nElectrolyte | \nW (аt.%) | \nR (kOhm сm−2) | \nRp (kOhm сm−2) | \nЕcorr (V) | \nJcorr × 103 (А сm−2) | \n
---|---|---|---|---|---|
1 | \n24.0 | \n0.92 | \n0.58 | \n−1.03 | \n0.84 | \n
2 | \n23.7 | \n0.46 | \n0.37 | \n−1.05 | \n0.11 | \n
3 | \n24.0 | \n0.34 | \n0.40 | \n−1.04 | \n0.17 | \n
4 | \n22.6 | \n0.40 | \n0.48 | \n−1.03 | \n0.12 | \n
Corrosion parameters of alloys in a 6 mol L−1 КОН solution.
The corrosion studies, carried out by us, of CoW alloys in a 6.0 mol L−1 КОН solution showed that the corrosion resistance in a concentrated КОН solution (Figure 12) is two order of magnitude lower than in a model NaCl solution; nevertheless, the coatings can be considered corrosion proof. It was noted that the coatings obtained for the experiment are of the worst quality in comparison with others, since they are intermediate at the transition from fine crystalline to spherulite deposits. The deposits of these two types are dense and smooth, and only at 10.0 mА сm−2, the largest number of cracks is observed, which accordingly affects the properties of coatings; nevertheless, the coatings have a low corrosion rate and are passivated in alkaline solution.
\nTo determine the corrosion properties of electrolytic Со-Мо alloys in the study [34], the coatings were deposited from a citrate-pyrophosphate electrolyte with different concentration ratios of the metals: [Co]/[Mo] = 1/1 and [Co]/[Mo] = 5/1. The aim of the authors was a large percentage of a component having ferromagnetic properties, i.e., cobalt. To fabricate cobalt-rich alloys, electrolytes with low sodium molybdate content and, hence, with small amount of molybdenum in the coating are used.
\nAs is seen from Figure 13, the amount of molybdenum in the alloy electrodeposited from an electrolyte at [Co]/[Mo] = 5/1 decreased relative to the alloy deposited from an electrolyte with [Co]/[Mo] = 1/1; in this case, however, no direct proportionality between the molybdenum content of the alloy and solution is observed. For instance, the concentration ratio of molybdate and cobalt in the electrolyte was 0.2 and changed from 0.4 to 0.27 in the coating. The amount of cobalt in the deposit changes only slightly on increasing the current density, but the percentage of nonmetallic impurities, mainly oxygen, increases, which affect the internal stresses in the deposit. Nevertheless, this change in the concentration ratio of the metals in the solution leads to a great increase in current efficiency for the alloy at low current densities (Figure 13b). Thus, it can be stated that in terms of the cobalt content of the alloy, the most optimal conditions for the deposition of magnetic coatings are current densities of 10–50 mА сm−2.
\nDependence of the ratio of the metals content (a) and current efficiency (b) for alloys electrodeposited from electrolytes with a concentration ratios [Co]/[Mo] = 1/1 and [Co]/[Mo] = 5/1 on current density.
The corrosion test of the obtained coatings was carried out in a sulfate-chloride solution. The calculation of corrosion resistance from electrochemical impedance data has been performed on the basis of an equivalent circuit comprising the ohmic resistance of the solution, charge transfer resistance, and a constant phase element.
\nAlloy samples electrodeposited from an electrolyte with [Co]/[Mo] = 5/1 with increasing current density, i.e., with decreasing molybdenum content (Figure 13, curve 2), and an alloy electrodeposited from an analogous citrate electrolyte containing no pyrophosphate at 30 mА сm−2, have been investigated. Figure 14 and Table 4 show no clear correlation between the molybdenum content of the alloy and corrosion resistance. Besides, the coatings deposited from solutions with the same ratio of the metals in the presence and absence of pyrophosphate are similar in anticorrosion properties despite the difference in their chemical composition.
\nStationary current-potential curves (a) and electrochemical impedance spectra (b) of the corrosion of alloys deposited from polyligand electrolyte (1–3) and a citrate electrolyte (4) at the deposition current densities, mА cm−2: 1—10; 2 and 4—30; and 3—50.
Electrolyte | \nj (mА сm−2) | \nМо (аt.%) | \nR (Оhm) | \nRp (Оhm) | \nЕcorr (V) | \nJcorr (А сm−2) | \n
---|---|---|---|---|---|---|
Citrate-pyrophosphate | \n10 | \n21.5 | \n5.05 × 102 | \n2.97 × 103 | \n−0.627 | \n3.58 × 10−4 | \n
30 | \n17.4 | \n5.71 × 103 | \n1.77 × 104 | \n−0.804 | \n829 × 10−6 | \n|
50 | \n16.0 | \n7.02 × 102 | \n3.55 × 102 | \n−0.677 | \n6.40 × 10−4 | \n|
Citrate | \n30 | \n23.9 | \n4.57 × 103 | \n8.06 × 103 | \n−0.804 | \n2.83 × 10−5 | \n
Dependence of the corrosion parameters of Со-Мо alloys on alloy composition.
Here, j is deposition current density.
The anticorrosion resistance of Co-Mo coatings is usually associated with the percentage content of molybdenum in them as a more corrosion-resistant metal, and the magnetic properties of coatings—with a cobalt content as a metal with ferromagnetic properties. However, the functional properties of coatings can depend not only on the chemical composition of the alloy but also on its phase composition, morphology, thickness, porosity, and other factors.
\nWhen studying the corrosion and magnetic properties of Со-Мо coatings [32] deposited from a citrate-pyrophosphate electrolyte, it was found that for the coatings obtained under different electrolysis conditions and having the same chemical composition, the corrosion stability and magnetic parameters are different; it was suggested that the properties of the alloy largely depend on its phase composition.
\nIn the study, the corrosion and magnetic properties of coatings with same Mo content of the alloy (21.2 аt.%), deposited from a citrate-pyrophosphate electrolyte under different electrolysis conditions, have been investigated. The corrosion stability of the coatings was studied in a solution containing 7 g L−1 Na2SO4 and 7 g L−1 NaCl at рН 6.0 and 24 ± 1°С (Table 5). The magnetic properties (Table 6) of the obtained deposits were determined by means of a vibrating sample magnetometer in fields of up to 20 kOe at room temperature (Table 5).
\nDeposition electrolyte | \nj (mА сm−2) | \nt (°С) | \nRр (Оhm) | \nЕcorr (V) | \nJcorr (А сm−2) | \n
---|---|---|---|---|---|
[Co]/[Mo] = 1/1 | \n30 | \n25 | \n2.71 × 103 | \n−0.804 | \n8.44 × 10−5 | \n
[Co]/[Mo] = 1/1 | \n40 | \n50 | \n9.82 × 102 | \n−0.808 | \n2.54 × 10−4 | \n
[Co]/[Mo] = 5/1 | \n10 | \n50 | \n2.97 × 103 | \n−0.627 | \n3.58 × 10−4 | \n
Corrosion properties of alloys having the same chemical composition (21.2 аt.% Мо).
The magnetic characteristics of such Alloys are also given. Their calculated values are listed in Table 6. The main criteria for evaluating the properties of soft-magnetic materials are low coercive force, low remanent magnetization and high saturation magnetization, as well as the ability to reach saturation magnetization in low intensity fields. It is evident from Table 6 that the largest saturation magnetization values—927 Gs were obtained at a magnetic field intensity of 3 kOe for the alloys deposited from an electrolyte with a ratio of 5:1. For the coatings deposited from an electrolyte with a ratio of 1:1, no saturation magnetization is observed even at 20 kOe; the maximum value obtained under experimental conditions for alloys deposited at 25° and 50°С was 113 and 290 Gs, respectively. Thus, it can be concluded that the alloy deposited from an electrolyte with the concentration ratio of the metals [Co]/[Mo] = 5/1. We assumed that such a difference in functional properties for the coatings having the same chemical composition may be due to a difference in their phase composition.
\nDeposition electrolyte | \nj (mА сm−2) | \nt (°С) | \nН (Oe) | \nMR (Gs) | \nМS (Gs) | \n
---|---|---|---|---|---|
[Co]/[Mo] = 1/1 | \n30 | \n25 | \n155 | \n5.0 | \n113 | \n
[Co]/[Mo] = 1/1 | \n40 | \n50 | \n117 | \n20.0 | \n290 | \n
[Co]/[Mo] = 5/1 | \n10 | \n50 | \n102 | \n252 | \n927 | \n
Magnetic properties of alloys having the same chemical composition (21.2 аt.% Мо).
Here, Н is coercive force, MR is remanent magnetization, and МS is saturation magnetization.
To study the phase composition, the electrochemical method of linear stripping voltammetric analysis (LSVA) was used [35]. An advantage of this method, besides simplicity, is the possibility to follow the dissolution dynamics of the alloy. Before the stripping analysis, a 0.5 μM thick layer of Co or Co-Mo alloys were deposited onto the working electrode from a citrate-pyrophosphate electrolyte with the concentration ratios of the metals [Co]/[Mo] = 1/1 and [Co]/[Mo] = 5/1 at a current density of 10–100 mА сm−2 and a temperature of 25 and 50°С.
\nThe electrolyte for the anodic dissolution of the obtained alloy deposits must meet the following requirements: it must have a high electrical conductivity, be nonaggressive toward the coating, and not cause spontaneous chemical dissolution. In this electrolyte, an electrochemical side reaction paralleling the anodic dissolution of the deposit under investigation must be ruled out. The use of various acids as working solutions was considered inexpedient since the electrochemical process in such electrolytes is paralleled by the chemical dissolution of the coating under analysis. Alkaline solutions are unsuitable for use as working electrolytes because of passivation processes on the surface of samples under investigation. The optimal solution for the anodic dissolution of coatings under investigation is NaCl solution, which makes it possible to obtain on the current-potential curves clear peaks corresponding to the dissolution potentials of the various phases of the alloy. The stripping analysis of coatings was performed in a 0.5 М NaCl solution at 25°С on a rotating disk electrode at a rotational speed of 774 rpm.
\nFigure 15 shows a current-potential curve of the dissolution of freshly deposited cobalt (curve 1) in a 0.5 М NaCl solution. The observed dissolution peaks are traditionally attributed to the complex phase structure of metals and alloys, but their number depends on the electrolyte in which dissolution is performed [35]. The plot of cobalt dissolution current vs. potential exhibits three peaks, which we further use in order to distinguish the peaks of dissolution of the alloy from the peaks of cobalt dissolution. The figure shows plots except the oxygen and chlorine evolution curve. It can be seen that in the case of dissolution of alloys, the magnitude of the peaks and their number are different. For instance, for the alloys deposited from an electrolyte with the same concentration ratio of the metals, the magnitude of peak 1 is the same, but besides it, only one large peak is observed for the alloy obtained at 50°С and 40 mА сm−2, whereas two peaks are observed for the alloy obtained at 25°С and 30 mА сm−2. However, for the alloy deposited from an electrolyte with lower molybdate content, the magnitude of peak 1 is much larger than for other alloys. Based on the potentials of the peaks, the known cathodic quantity of electricity, the phase diagram of the double layer, and stoichiometry, it can be suggested that peaks 1 and 3 relate to cobalt dissolution and peak 2 to the dissolution of a solid solution of the chemical compound СоМо in cobalt.
\nAnodic dissolution curves for pure cobalt (curve 1) and Co-Mo alloys (21.1 at.% Mo) deposited under the following conditions: 2—Co:Mo = 5:1, 50°C, 10 mA cm−2; 3—Co:Mo = 1:1, 25°C, 30 mA cm−2; 4—Co:Mo = 1:1, 50°С, 40 mА сm−2.
Thus, the alloy deposited from an electrolyte containing a small amount of molybdate contains a larger amount of cobalt bound into neither a chemical compound nor a solid solution; this can explain the 200 mV shift of the corrosion potential of this alloy to positive values, i.e., cobalt is a more electropositive metal than molybdenum, as well as the improvement of the magnetic properties of the alloy. The increase in peak 2 indicates an increase in the percentage of the molybdenum-rich phase, which results in the improvement of the corrosion properties of alloys.
\nStripping analysis of alloys deposited from an electrolyte with [Co]/[Mo]=1/1 at different current densities is shown in Figure 16. It is seen from the figure that for the coatings obtained at lower deposition current densities 10–20 mА сm−2, three dissolution peaks are observed. For the alloys deposited at 30 and 40 mА сm−2, only two dissolution peaks are observed. The magnitude of peak 1 remains unchanged, and it can be assumed to correspond to the amount of cobalt that is directly on the electrode surface, i.e., dissolution of the less corrosion-resistant component than the alloy takes place, and since the electrode geometry does not change, the quantity of electricity for dissolution remains constant too. In the remaining alloy phase at different current densities, different redistribution of cobalt between the solid solution and the free α-phase takes place.
\n(a) Anodic current-potential curves of the dissolution of Co-Mo alloys deposited from an electrolyte at [Co]/[Mo] = 1/1 at 50°C at different current densities, mA cm−2: 1—10, 2—20, 3—30, 4—40 and (b) The magnitude of anodic dissolution peaks.
To study the alloy formation process, anodic polarization curves have been obtained for Со-Мо alloys deposited from an electrolyte with [Co]/[Mo] = 1/1 under the conditions corresponding to the maximum current efficiency: a current density of 30 mА сm−2 and at temperature of 50°С [36]. The coatings were deposited during 30, 60, 120, and 210 s (Figure 17). All current-potential curves of the dissolution of Со-Мо alloys exhibit two peaks. As one would expect, the quantity of electricity for the dissolution of the solid solution increases linearly with deposition time. We failed, however, to determine the order of deposition of the components; using this method, it is impossible to either confirm or refute the hypothesis that cobalt deposits first, which catalyzes later the reduction of molybdenum. Under our experimental conditions, an alloy phase which grows uniformly with increasing deposition time is present in the alloy even within a deposition time of 30 s.
\n(a) Anodic current-potential curves of the dissolution of Co-Mo alloys deposited from an electrolyte with [Co]/[Mo]=1/1 at 30 mA∙cm−2 and 50°C at different deposition time, s: 1—30, 2—60, 3—120, 4—210. (b) The magnitude of the anodic dissolution peaks: 1—the first peak, and 2—the second peak.
Electrolytic alloys of molybdenum and tungsten with iron subgroup metals possess catalytic properties in the hydrogen evolution reaction and can be used as a coating which improves the properties of exiting nickel cathodes.
\nFor each particular electrolyte and particular deposition conditions, the activity of the alloy and its corrosion stability increase with the amount of molybdenum, but the comparison of data obtained by different authors does not give a clear correlation.
\nThe properties of alloys depend not only on their chemical composition but also on their phase composition. The alloy containing the same amount of molybdenum, but fabricated under different conditions, has different corrosion and magnetic properties.
\nThe amorphous and nanocrystalline structure of electrolytic alloys makes hydrogen spillover possible, which greatly accelerates the hydrogen reduction process in alkaline electrolytes.
\nElectrolytic coatings of refractory metals alloys have a wide range of physicochemical properties. Controlling the electrolysis modes allows precipitating and accurately controlling the chemical and phase composition of the coatings, and hence producing corrosion-resistant materials for soft magnetic materials, electrocatalysts, and wear-resistant coatings.
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\\n\\nIntechOpen has collaborated with Enago, through its sister brand, Ulatus, which is one of the world’s leading providers of book translation services. The services are designed to convey the essence of your work to readers from across the globe in a language they understand. Enago’s expert translators incorporate cultural nuances in translations to make the content relevant for local audiences while retaining the original meaning and style. Enago translators are equipped to handle all complex and multiple overlapping themes encompassed in a single book and their high degree of linguistic and subject expertise enables them to deliver a superior quality output.
\\n\\nIntechOpen Authors that wish to use this service will receive a 20% discount on all translation services. To find out more information or obtain a quote, please visit: https://www.enago.com/intech.
\\n\\nFUNDING
\\n\\nWe feel that financial barriers should never prevent researchers from publishing their work. Please consult our Open Access Funding page to explore funding opportunities and learn more about how you can finance your IntechOpen publication.
\\n\\nBENEFITS
\\n\\nPUBLISHING PROCESS STEPS
\\n\\nFor a complete overview of all publishing process steps and descriptions, go to How Open Access Publishing Works.
\\n\\nSEND YOUR PROPOSAL
\\n\\nIf you are interested in publishing your book with IntechOpen, please submit your book proposal by completing the Publishing Proposal Form.
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\n\n*The price does not include Value-Added Tax (VAT). Residents of European Union countries need to add VAT based on the specific rate applied in their country of residence. Institutions and companies registered as VAT taxable entities in their own EU member state will not pay VAT by providing us with their VAT registration number. This is made possible by the EU reverse charge method.
\n\nOptional Services
\n\nIntechOpen has collaborated with Enago, through its sister brand, Ulatus, which is one of the world’s leading providers of book translation services. The services are designed to convey the essence of your work to readers from across the globe in a language they understand. Enago’s expert translators incorporate cultural nuances in translations to make the content relevant for local audiences while retaining the original meaning and style. Enago translators are equipped to handle all complex and multiple overlapping themes encompassed in a single book and their high degree of linguistic and subject expertise enables them to deliver a superior quality output.
\n\nIntechOpen Authors that wish to use this service will receive a 20% discount on all translation services. To find out more information or obtain a quote, please visit: https://www.enago.com/intech.
\n\nFUNDING
\n\nWe feel that financial barriers should never prevent researchers from publishing their work. Please consult our Open Access Funding page to explore funding opportunities and learn more about how you can finance your IntechOpen publication.
\n\nBENEFITS
\n\nPUBLISHING PROCESS STEPS
\n\nFor a complete overview of all publishing process steps and descriptions, go to How Open Access Publishing Works.
\n\nSEND YOUR PROPOSAL
\n\nIf you are interested in publishing your book with IntechOpen, please submit your book proposal by completing the Publishing Proposal Form.
\n\nNot sure if this is the right option for you? Please refer back to the main Publish with IntechOpen page or feel free to contact us directly at book.department@intechopen.com.
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