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Perovskite Strontium Doped Rare Earth Manganites Nanocomposites and Their Photocatalytic Performances

Written By

Ihab A. Abdel-Latif

Submitted: 03 March 2018 Reviewed: 12 June 2018 Published: 05 November 2018

DOI: 10.5772/intechopen.79479

From the Edited Volume

Nanocomposites - Recent Evolutions

Edited by Subbarayan Sivasankaran

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Studying catalysts in situ is an important topic that helps us to understand their surface structure and electronic states in operation. Three types of materials are used in the degradation of organic matter, which has applications in the environmental remediation and self -cleaning surfaces. The technique is widely known but still hampered by one significant limitation. The materials generally absorb ultra violet UV light but we need to develop active materials for visible light. Utilizing the sunlight efficiently for solar energy conversion is an important demand in the present time. The research on visible-light active photocatalysts attracted a lot of interest. The perovskite-like compounds are found to be active catalysts for the oxidation of carbon monoxide. In the present chapter, we will focus on the application of the nano-sized strontium doped neodymium manganites within perovskite like structure as photocatalysis and studying their photocatalytic performance.


  • photocatalytic
  • perovskite
  • manganites
  • nanocomposites
  • visible light

1. Introduction

Photocatalysis is the acceleration of a photoreaction in the presence of a catalyst. The ability to generate electron–hole pairs and free radicals is very important parameters to understand the photocatalytic activity (PCA) in photogenerated catalysis [1]. On other words we can describe the photocatalysis process as two parts, “photo” and “catalysis”. Let us define the catalysis as the process in which a material participates in modifying the rate of a chemical transformation of the reactants without altering or consuming in the end. This material is so called catalyst, which the activation energy is reduced that may lead to acceleration of the reaction. In general, light is used to activate a substance, which modifies the rate of a chemical reaction without being involved itself, and the photocatalyst is the substance, which can modify the rate of chemical reaction using light irradiation [1]. Chlorophyll of plants is good example for the natural photocatalyst. The difference between chlorophyll photocatalyst and nano TiO2 photocatalyst (see Figure 1) [2] is, usually chlorophyll captures sunlight to turn water and carbon dioxide into oxygen and glucose, while photocatalyst creates strong oxidation agent and electronic holes to breakdown the organic matter to carbon dioxide and water in the presence of photocatalyst, light and water [2]. So many materials are developed daily to be applied as photocatalysis and nanocompsites that have perovskites-like structure are promising materials for these applications.

Figure 1.

Nano TiO2 photocatalyst and chlorophyll of plants is a typical natural photocatalyst [2].


2. Mechanism of photocatalysis

When photocatalyst such as titanium dioxide (TiO2) absorbs Ultraviolet (UV)* radiation comes from sun or any other illuminated light source (e.g., fluorescent lamps), pairs of electrons and holes are produced, see Figure 2. As a result of the light illumination, the electron of the valence band of titanium dioxide becomes excited. Excited electron transits to the conduction band of titanium dioxide with excess energy to create pair of charges; the negative-electron (e-) and positive-hole (h+). This behaviour is well known as the semiconductor’s photo-excitation’ state. The ‘Band Gap’ is defined as a result of the difference in energy between the valence band and the conduction band. The necessary wavelength of the light required for the photo-excitation is given according to 1240 (Planck’s constant, h)/3.2 eV (band gap energy) and equal to 388 nm [3]. The hole with positive charge in titanium dioxide may split the water molecule into both of the hydrogen gas and hydroxyl radical. On the other side, the electron with negative charge reacts with oxygen molecule forming the super oxide anion. The continuity of this cycle depends on the availability of the light [3].

Figure 2.

Schematic diagram showing the photocatalysis mechanism by producing both holes and electrons as a result of illumination [3].

Solar energy is clean and till now its utilization is limited. A strong need to develop a sustainable and cost-effective manner for harvesting solar energy to satisfy the growing energy demand of the world with a minimal environmental impact [4]. Photo-catalysis plays an important role for the conversion of solar energy into chemical fuel, electricity, the decomposition of organic pollutants etc.

The degradation behaviors were studied by Sher Bahadar Khan et al. [5] and the degradation pattern of AO by Langmuir–Hinshelwood (L–H) model was defined and given from the relationship between the rate of degradation and the initial concentration of AO in photo-catalytic reaction [6].

The rate of photo-degradation was calculated according to the following equation; Eq. (1)

r = dC / dt = K r K C = K appC E1

where r in this equation is defined as the degradation rate of organic pollutant, Kr is describing the reaction rate constant, K is constant equal to the equilibrium constant, C is the concentration of the reactant. From Eq. 1, we can neglect KC when C becomes very small so this equation could describe the first order kinetic. Applying the following initial conditions, (t = 0, C = C0) in Eq. (1), that may lead to a new equation; Eq. (2).

ln C / C 0 = k t E2

Half-life, t1/2 (in min) is

t 1 / 2 = 0.693 / k E3

The photo degradation of AO in the presence of CeO21 nano-particles is shown in Figure 3.

Figure 3.

Photo-degradation of AO in the presence of CeO21 nanoparticles [5].

Different materials are used as photocatalysis and research is going on to apply a new material for this applications. The rare earth manganite is one of the promising materials for photocatalysis and so in the present proposal we develop the strontium doped neodymium manganites nanocomposites within perovskite like structure as photocatalysis and studying its performance and so the main goals are; −synthesis new perovskite materials enhanced the photocatalysis performance applying the obtained results for solar energy utilizations.

Metal oxide photocatalysis is based on metal oxide like titanium dioxide as light-activated catalysts [7]. Three types of materials are used in the degradation of organic matter which has applications in the environmental remediation and self -cleaning surfaces. The technique is widely known but still hampered by one significant limitation. The materials generally absorb ultra violet UV light but we need to develop active materials for visible light, see Figure 4.

Figure 4.

Schematic representation; top light with energy higher than band gap leads to charge separation, with electron reducing a donor (usually oxygen) and hole oxidizing a donor (usually water); summary of processes occurring. Image based on Bahnemann (2004) [7].


3. Perovskites as photocatalytic

ABO3 perovskites are very essential family of oxide materials because they possess very interesting physical and chemical properties. These unusual properties may lead to use these materials in potential applications. The corner-shared octahedral BO6 lattice site in these materials play very important role in transfer of oxygen and electrons easily and may lead to nonstoichiometry of oxygen [8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23]. Moreover, the mixed valence states of the transition metal at B-site are also important term in such perovskite-type oxides, which affect their activity. Nevertheless a lot of applications depend on the A and B cations in the ABO3 perovskites, such as electrocatalysts for O2 evolution [8, 9, 10], catalysts [11, 12], photo/electro- catalysts for hydrogen production and pollutants degradation [13, 14, 15, 16, 17, 18, 19] and electrode material used in fuel cells [13]. The synthesis of perovskite materials could be done using different methods such as solid state reaction [24, 25, 26, 27, 28], chemical co-precipitation [29, 30, 31, 32, 33], sol–gel [34, 35, 36, 37, 38]. In each method there are parameters to play with in order to improve the properties of the required materials. A lot of perovskite oxides have been synthesized such as tantalate [39, 40, 41, 42, 43], titanate [14, 44, 45, 46, 47, 48, 49, 50], ferrite, [51, 52] vanadium-and niobium-based perovskites [53, 54, 55, 56], and manganites [57, 58] and they have shown visible light photocatalytic activity as a result of their unique electronic properties and crystal structures [59]. The reduced band-gap energy values in the doped alkaline rare-earth transition metal perovskite-like structure oxides focus more attention because this property enhances the separation of charge carriers (photogenerated electrons and holes) [60]. Intensive studies have been done on these materials because of the capability of tuning their electrical and optical properties, indicating a control of their rational design structure by substitutions of cationic in ABO3 pervoskite [61, 62]. Therefore, we can say that the perovskite compounds are one of the promising structure that are adapting the bandgap values to harvest visible-light absorption and the potentials of band edge to tailor the needs of particular photocatalysis.

Furthermore, the lattice distortion existed in the rare earth transition metal perovskite compounds strongly affects the separation of photogenerated charge carriers [59, 63, 64]. The distortion in the bond angles resulted from both; metal-ligand or the metal-ligand-metal into perovskite framework are significantly related to their charge carriers and band gap values [65, 66, 67]. The crystallinity, phase structure, size, and surface area affect the efficiency of photocatalysts. Consequently, control of the shape of perovskites and the size and crystal phase is essential and significant parameter for assessing their phase-dependent photoactivity and promoting perovskites-based driven visible light photocatalysts. According to Abdel-Latif et al. [66], Nd0.6Sr0.4MnO3 was studied as superior photocatalyst under visible light, different modifications of perovskite Nd0.6Sr0.4MnO3 to get high harvesting of photons and enhancing the migration and separation of the photogenerated charge carriers through the photocatalytic reaction [61, 62, 63, 64, 65]. For the first time, the impact on phase structures and photocatalytic efficiencies under visible light of the annealed Nd0.6Sr0.4MnO3 perovskite which prepared by sol–gel method in the presence of polyethylene glycol and citric acid was studied by Abdel-Latif et al. [66], and the Nd0.6Sr0.4MnO3 perovskite annealed at 500°C was found to be a superior photocatalyst than that annealed at 800, 1000 and 1150°C. Nd0.6Sr0.4MnO3 semiconductor has a narrow band gap energy values ranged from 2 to 2.98 eV, which we can control its value by changing its annealing temperatures. Charge carriers created by absorbing visible light (photogenerated electrons and holes) depend on the excitation by this visible light. The hole, which photogenerated in the valence band reacts either with the adsorbed OH ions or H2O onto the surface of NSMO producing OH. On the other side, the electron, which photogenerated in the conduction band reduces O2 to get O2 give rising to other oxidative O2 species (i.e., OH and H2O2). The photocatalytic efficiencies of the Nd0.6Sr0.4MnO3 nanocomposites were evaluated in Ref. [66] for the MB photodegradation, where they calculated the MB photodecomposition under visible light illumination by recording absorption spectra. They found that MB is negligible at the photolysis and it is stable after visible light illumination for 3 h. Furthermore, there is a slight decrease in MB concentration as a result of adsorption onto Nd0.6Sr0.4MnO3 surface when it is suspended with MB solution in dark as shown in Figure 5. The observed MB absorption bands at λ = 663 and 291 nm gradually decreased upon boosting illumination times.

Figure 5.

Optical bandgap energy Eg for nano Nd0.6Sr0.4MnO3 perovskite annealed at 500°C (a), relation between the bandgap energy Eg values and the percentage of the monoclinic phase (b) [66].

As it is clear from the photocatalytic performance of the Nd0.6Sr0.4MnO3 perovskite, the crystalline size (55 nm), which depends on the annealed temperature (500°C). The mixed perovskite structure Nd0.6Sr0.4MnO3 (26.18% orthorhombic “Orth” and 73.82% monoclinic “Mon”) obtained at annealing temperature 500°C is a superior photocatalyst candidate than that of Nd0.6Sr0.4MnO3 perovskite obtained at annealing temperature 1150°C and with mixed structure (82.22% cubic “Cub” and 17.78% orthorhombic “Orth” phases). The observed photo degradation was 100% by the annealing temperate 500°C of the Nd0.6Sr0.4MnO3 perovskite [66]. However, as a result of the increase in the annealing temperature to 1150°C, reduction in the photocatalytic efficiency was observed to be 60%. Looking at the effect of the annealing temperature in Nd0.6Sr0.4MnO3 perovskite according to Abdel-Latif et al., [66], the overall photodegradation rate of the sample annealed at 500°C is significantly 3-times higher than that of the other sample, which annealed at 1150°C. The superiority of the neodymium strontium doped manganite, which annealed at 500°C is attributed to the mixed crystallographic structure with double phases (Mon/Orth) framework, high crystallinity, and the Mn-O polyhedron distortion. From this work on can say that key factors for the high photocatalytic activity of the obtained neodymium strontium doped manganite with annealing temperature 500°C are the high visible-light absorption, lattice distortion and narrow band gap.

Another example of the rare earth manganites is the non-stoichiometric perovskites; La1−xSrxMnO3−δ (x = 0.35, 0.50, 0.65, 0.80) series, which was examined by Antoine Demont and Stéphane Abanades [67] in the context of solar-driven two-step thermo-chemical dissociation of CO2. All the performance characterization measurements such as X-ray diffraction and thermochemical characterizations were carried out in order to the evaluation of the redox activity of these materials toward the thermal reduction under inert atmosphere followed by the re-oxidation process and carbon oxide generation from CO2. They found that, the control of introducing strontium into lantanium manganite allowed tuning the redox thermodynamics within the series. The high activity observed toward both thermal reduction and CO2 dissociation occurred. As a result of analysis of experimental measurements they found that the La0.50Sr0.50MnO3−δ composition is a promising candidate for thermochemical CO2 splitting Figures 6 and 7.

Figure 6.

Solar-driven two-step thermochemical dissociation of CO2 in La1-xSrxMnO3-δ [67].

Figure 7.

Three-way catalytic converter TWC [71].

Maximum production of carbon oxide is reached in the range of 270 μmol g−1 during the carbon dioxide splitting step with an optimal temperature of re-oxidation 1050°C (thermal reduction performed under Argon gas at 1400°C), in spite of the re-oxidation yield limitation “50%”. The evolution of the manganese oxidation state reveal partial re-oxidation of Mn3+ into Mn4+, thus the activation of Mn4+/Mn3+ redox pair in the perovskites was confirmed. They concluded that the mixed valence perovskites have clear potential for displaying redox properties suitable for efficient solar-driven thermochemical CO2 dissociation [67].

Oxygen diffusion and desorption in oxides have been developed for slightly defective and well crystallized bulky materials in Ref. [68]. The relation between nanostructure and the change of the mechanism of oxygen mobility has been studied in this work. Temperature programmed oxygen desorption and thermogravimetric analysis applied to study some nanostructured perovskite-like structure La1–xAxMnOδ samples (A = Sr. and Ce, 20–60 nm particle size) [53]. Depending on the temperature range and oxygen depletion of the material different rate-determining steps have been identified. Particularly, oxygen diffusion was demonstrated at low temperature and defect concentration, whereas the oxygen recombination at the surface seems is controlled at high temperature. However, the lower activation energy is responsible for the oxygen recombination step.

Utilizing the sunlight efficiently for solar energy conversion, the research on visible-light active photocatalysts attracted a lot of interest [4]. The photosensitization of transition metal oxides is a promising approach for achieving effective visible light photocatalysis. The world of nanostructured photosensitizers, for example, plasmonic metal nanostructures, quantum dots, and carbon nanostructures engaged with the wide-bandgap in transition metal oxides that allow us to design a new visible-light active photocatalysts [4]. The implied mechanisms of the nanocomposite photocatalysts, for example, the charge separation inducing light and the visible-light photocatalytic reaction procedure in environmental treatment besides solar fuel generation fields, are also presented [10].

The rare earth manganites as well as the rare earth cobalt with perovskite-like structure (the rare earth like; lanthanum, praseodymium, or neodymium) are studied in Ref. [69], where they found that these materials are active catalysts for the oxidation of carbon monoxide. Comparing initial activity and lifetime in crushed single crystals of these composites and the commercial platinum catalysts showed its good performance. Therefore, one can say that these materials are considered as a promising alternate for platinum in devices for the catalytic treatment of auto exhaust.

The phonon-mode assignment of dysprosium chromate (DyCrO3) nanoplatelets by Raman spectroscopy was reported recently [70]. They reported the effect of temperature on Raman spectra and they showed the shift in the phonon frequency of most intense modes in dysprosium chromate (DyCrO3). The change in Raman line-width is observed, which is an indication to its correlation with the spin–phonon coupling. The impedance spectroscopy described in this work implied the anomalies in the dielectric constant dependent on temperature near the magnetic transitions point that may lead to postulate possible weak magnetoelectric coupling in DyCrO3 nanoplatelets. Furthermore, UV–Vis absorption spectroscopy has been measured beside the photocatalytic activity measurement for DyCrO3 nanoplatelets. The band gap deduced from the optical absorption spectrum was ∼2.8 eV for DyCrO3 nanoplatelets and this energy is considered as a good enough for the photocatalytic activity application. The efficient photocatalytic activity of DyCrO3 nanoplatelets are described in this work, where degrading value was 65% for 8 h irradiation [70].

Three-way catalysts (TWC) were introduced more than 40 years ago and the development of a sustainable TWC still remains an important subject owing to the increasingly stringent emission regulations together with the price and scarcity of precious metals [71]. Perovskite-type oxides are alternatives to the conventionally used TWC compositions and it is suitable for a wide range of automotive applications, ranging from TWC to diesel oxidation catalysts (DOC). The interest in these catalysts has been renewed because of the catalyst regenerability of perovskite-based TWC concept. Principally, it is applicable to other catalytic processes and there is possibility to reduce the amounts of critical elements, such as valuable metals without industriously lowering the catalytic performance.

Studying catalysts in situ is of high interest for understanding their surface structure and electronic states in operation [72]. The epitaxial manganite perovskite thin films (Pr1−xCaxMnO3) were found to be active for the oxygen evolution reaction (OER) from water splitting as a result of electro-catalytic water splitting. X-ray absorption near-edge spectroscopy (XANES), at the Mn L- and O K-edges, was measured and analyzed in Ref. [72], besides measuring the X-ray photoemission spectroscopy (XPS) of the O 1s and Ca 2p states. Both measurements were carried out under the following conditions; in water vapor under positive applied bias, in ultra-high vacuum and at room temperature [72]. According to the research in Ref. [72] under the oxidizing conditions of the OER a reduced Mn2+ species is generated at the catalyst surface and the Mn valence shift is accompanied by the formation of surface oxygen vacancies.

According to Madhavan and Ashok [73], perovskite materials exhibiting proton and oxide ion conductivities have been used for various energy-related applications such as solid oxide fuel cells (SOFCs), hydrogen production, gas sensors, etc. Nowadays, nanoperovskites were synthesized and were studied for catalytic activity and energy-related applications. The mechanism of proton and oxide ion conduction, and some specific properties and behaviors of few nanoperovskites as oxide ion and proton conductors and applications have been reported and discussed in this work [73].


4. Conclusions

As it is clear from the photocatalytic performance of the Nd0.6Sr0.4MnO3 perovskite, the crystalline size (55 nm), which depends on the annealed temperature (500°C). The mixed phases (26.18% Orth and 73.82% Mono) in the Nd0.6Sr0.4MnO3 perovskite as a result of annealing at 500°C is a superior photocatalyst than those of Nd0.6Sr0.4MnO3 perovskite annealed at different temperatures. The maximum photodegradation of MB for the strontium doped neodymium manganites perovskite was achieved for those annealed at 500°C. As a result of the increase in the annealing temperature (annealing at 1150°C), the reduction to 60% in the photocatalytic efficiency was achieved. Comparing the overall photodegradation rates of the strontium doped neodymium manganites perovskite as a function of the annealing temperature we found 500°C annealing temperature is significantly 3-times higher than that of other temperatures. This superiority of the low annealing temperature in the case of Nd0.6Sr0.4MnO3 perovskite is attributed to the forming these materials in mixed phases (double phases, Mono – Ortho phases) and its high crystallinity. Besides, the high Mn-O polyhedron distortion excited in these materials. So one can conclude that the annealing temperature plays very important role to improving the photocatalytic performance. The following factors; visible-light absorption, narrow band gap and lattice distortion are the key factors that determine the high photocatalytic activity of the obtained in such materials and good example for that the Nd0.6Sr0.4MnO3 perovskite annealed at 500°C.



The author is thankful to the Deanship of Scientific Research in Najran University for their support NU/ESCI/15/011.


  1. 1.
  2. 2.
  3. 3.
  4. 4. Chen H, Wang L. Nanostructure sensitization of transition metal oxides for visible-light photocatalysis. Beilstein Journal of Nanotechnology. 2014;5:696-710
  5. 5. Bahadar KS, Faisal M, Rahman Mohammed M, Kalsoom A, Asiri Abdullah M, Anish K, Alamry Khalid A. Effect of particle size on the photocatalytic activity and sensing properties of CeO2 nanoparticles. International Journal of Electrochemical Science. 2013;8:7284-7297
  6. 6. Faisal M, Khan SB, Rahman MM, Jamal A, Asiri AM, Abdullah MM. Smart chemical sensor and active photo-catalyst for environmental pollutants. Chemical Engineering Journal. 2011;173:178-184
  7. 7. Bahnemann D. Photocatalytic water treatment: Solar energy applications. Solar Energy. 2004;77:445-459.
  8. 8. Soares CO, Silva RA, Carvalho MD, Melo Jorge ME, Gomes A, Rangel CM, da Silva Pereira MI. Oxide loading effect on the electrochemical performance of LaNiO3 coatings in alkaline media. Electrochimica Acta. 2013;89:106-113
  9. 9. Costa AB, Melo Jorge ME, Carvalho MD, Gomes A. LaNi1 − xCuxO3 (x = 0.05, 0.10, 0.30) coated electrodes for oxygen evolution in alkaline medium. Journal of Solid State Electrochemistry. 2013;17:2311-2318
  10. 10. Soares CO, Carvalho MD, Melo Jorge ME, Gomes A, Silva RA, Rangel CM, da Silva Pereira MI. High surface area LaNiO3 electrodes for oxygen electrocatalysis in alkaline media. Journal of Applied Electrochemistry. 2012;42:325-332
  11. 11. Machida M, Ochiai K, Ito K, Ikeue K. Catalytic properties of novel La–Sr–Cu–O–S perovskites for automotive C3H6/CO oxidation in the presence of SOx. Catalysis Today. 2006;117:584-587
  12. 12. Wang C-H, Chen CL, Weng HS. Surface properties and catalytic performance of La1−xSrxFeO3 perovskite-type oxides for methane combustion. Chemosphere. 2004;57:1131-1138
  13. 13. Pacheco MJ, Regalado F, Santos D, Ciríaco L, Lopes A. Synthesis and environmental applications of BaPb1-xSbxO3 solid solutions. Journal of The Electrochemical Society. 2014;161:H474-H480
  14. 14. Gao F, Chen X, Yin K, Dong S, Ren Z, Yuan F, Yu T, Zou Z, Liu JM. Visible-light photocatalytic properties of weak magnetic BiFeO3 nanoparticles. Advanced Materials. 2007;19:2889-2892
  15. 15. Li FT, Liu Y, Liu RH, Sun ZM, Zhao DS, Kou CG. Preparation of Ca-doped LaFeO3 nanopowders in a reverse microemulsion and their visible light photocatalytic activity. Materials Letters. 2010;64:223-225
  16. 16. Parida KM, Reddy KH, Martha S, Das DP, Biswal N. Pt modified TiO2 nanotubes electrode: Preparation and electrocatalytic application for methanol oxidation. International Journal of Hydrogen Energy. 2010;35:12161-12168
  17. 17. Pareek VK, Adesina AA. Handbook of photochemistry and photobiology. Stevenson Ranch, CA: American Scientific Publishers; 2003
  18. 18. Cui BJ, Dunn S. Effect of ferroelectricity on solar-light-driven photocatalytic activity of BaTiO3—Influence on the carrier separation and stern layer formation. Chemistry of Materials. 2013;25:4215-4223
  19. 19. Barrocas B, Sério S, Rovisco A, Melo Jorge ME. Visible-light photocatalysis in Ca0.6Ho0.4MnO3 films deposited by RF-magnetron sputtering using nanosized powder compacted target. Journal of Physical Chemistry C. 2014;118:590-597
  20. 20. Zhou W, Ran R, Shao Z. Progress in understanding and development of Ba0.5Sr0.5Co0.8Fe0.2O3−δ-based cathodes for intermediate-temperature solid-oxide fuel cells: A review. Journal of Power Sources. 2009;192:231-246
  21. 21. Ni L, Tanabe M, Irie H. A visible-light-induced overall water-splitting photocatalyst: conduction-band-controlled silver tantalate. Chemical Communications. 2013;49:10094-10096
  22. 22. Li M, Zhang J, Dang W, Cushing SK, Guo D, Wu N, Yin P. Photocatalytic hydrogen generation enhanced by band gap narrowing and improved charge carrier mobility in AgTaO3 by compensated co-doping. Physical Chemistry Chemical Physics. 2013;15:16220-16226
  23. 23. Kanhere P, Shenai P, Chakraborty S, Ahuja R, Zheng J, Chen Z. Mono- and co-doped NaTaO3 for visible light photocatalysis. Physical Chemistry Chemical Physics. 2014;16:16085-16094
  24. 24. Abdel-Latif IA, Hassen A, Zybill C, Abdel-Hafiez M, Allam S, El-Sherbini T. The influence of tilt angle on the CMR in Sm0.6Sr0.4MnO3. Journal of Alloys and Compounds. 2008;452(2):245-248
  25. 25. Bouziane K, Yousif A, Abdel-Latif IA, Hricovini K, Richter C. Electronic and magnetic properties of SmFe1-xMnxO3 orthoferrites (x = 0.1, 0.2 and 0.3). Journal of Applied Physics. 2005;97(10A):504
  26. 26. Bashkirov S, Parfenov VV, Abdel-Latif IA, Zaripova LD. Mössbauer effect and electrical conductivity studies of SmFexMn1-xO3 (x = 0.7, 0.8 and 0.9). Journal of Alloys and Compounds. 2005;387:70
  27. 27. Yousif AA, Abdel-Latif IA, Bouziane K, Sellai A, Gismelseed A, Al-Omari I, Widatallah H, Al-Rawas AD, Elzain M. Study on mössbauer and magnetic properties of strontium doped neodymium ferrimanganites perovskite-like structure. AIP Conference Proceedings. 2011;1370:103-107
  28. 28. Bashkirov S, Parfenov VV, Valiullin AA, Khramov AS, Trounov VA, Smirnov AP, Abdel-Latif IA. Crystal structure, electric and magnetic properties of ferrimanganite NdFexMn1-xO3. Izv. RAS, Physical Series. 2003;67(7):1072 (in Russian)
  29. 29. Abdel-Latif IA. Study on the effect of particle size of strontium - ytterbium manganites on some physical properties. AIP Conference Proceedings. 2011;1370:108-115
  30. 30. Abdel-Latif IA, Al-Hajary A, Hashem H, Ghoza MH, El-Sherbini T. The nano particle size effect on some physical properties of neodymium coblate-manganites for hydrogen storage. AIP Conference Proceedings. 2011;1370:158-164
  31. 31. Khan SB, Faisal M, Rahman MM, Abdel-Latif IA, Ismail AA, Akhtar K, Al-Hajry A, Asiri AM, Alamry Kh. A. Highly sensitive and stable phenyl-hydrazine chemical sensors based on CuO flower shape and hollow sphere nanosheets. New Journal of Chemistry. 2013;37:1098
  32. 32. Abdel-Latif IA. Rare earth manganites and their applications. Journal of Physics. 2012;1(2):50-53
  33. 33. Ghozza MH, Abdel-Latif IA, Allam SH. Properties of 3d-4f Oxides Nanoparticles. Germany: Scholars’ Press; 2013
  34. 34. Abdel-Latif IA, Ismail A, Bouzaid H, Al-Hajry H. Synthesis of novel perovskite crystal structure phase of strontium doped rare earth manganites using sol gel method. Journal of Magnetism and Magnetic Materials. 2015;293:233
  35. 35. Abdel-Latif IA. Advances in Rare Earth Transition Metal Oxides Semiconductor Materials. USA: Science Publishing Group; 2015
  36. 36. Abdel-Latif IA, Rahman MM, Khan SB. Neodymium cobalt oxide as a chemical sensor. Results in Physics. 2018;8:578-583
  37. 37. Faisal M, Ismail AA, Ibrahim AA, Bouzid H, Al-Sayari SA. Highly efficient photocatalyst based on Ce doped ZnO nanorods: Controllable synthesis and enhanced photocatalytic activity. Chemical Engineering Journal. 2013;229:225-233
  38. 38. Faisal M, Ismail AA, Harraz FA, Bouzid H, Al-Sayari SA, Al-Hajry A. Mesoporous TiO2 based optical sensor for highly sensitive and selective detection and preconcentration of Bi(III) ions. Chemical Engineering Journal. 2014;243:509-516
  39. 39. Marchelek M, Bajorowicz B, Mazierski P, Cybula A, Klimczuk T, Winiarski M, Fijałkowska N, Zaleska A. KTaO3-based nanocomposites for air treatment. Catalysis Today. 2014;252:47-53
  40. 40. Liu X, Lv J, Wang S, Li X, Lang J, Su Y, Chai Z, Wang X. A novel contractive effect of KTaO3 nanocrystals via La3+ doping and an enhanced photocatalytic performance. Journal of Alloys and Compounds. 2015;622:894-901
  41. 41. Townsend TK, Browning ND, Osterloh FE. Overall photocatalytic water splitting with NiOx–SrTiO3 – a revised mechanism. Energy & Environmental Science. 2012;5:9543-9550
  42. 42. Chen H-C, Huang C-W, Wu JC, Lin S-T. Theoretical investigation of the metal-doped SrTiO3 photocatalysts for water splitting. Journal of Physical Chemistry C. 2012;116:7897-7903
  43. 43. Kato H, Sasaki Y, Shirakura N, Kudo A. Synthesis of highly active rhodium-doped SrTiO3 powders in Z-scheme systems for visible-light-driven photocatalytic overall water splitting. Journal of Materials Chemistry A. 2013;1:12327-12333
  44. 44. Jia Y, Shen S, Wang D, Wang X, Shi J, Zhang F, Han H, Li C. Composite Sr2TiO4/SrTiO3(La,Cr) heterojunction based photocatalyst for hydrogen production under visible light irradiation. Journal of Materials Chemistry A. 2013;1:7905-7912
  45. 45. Maeda K. Rhodium-doped barium titanate perovskite as a stable p-type semiconductor photocatalyst for hydrogen evolution under visible light. ACS Applied Materials & Interfaces. 2014;6:2167-2173
  46. 46. Zhang H, Chen G, Li Y, Teng Y. Electronic structure and photocatalytic properties of copper-doped CaTiO3. International Journal of Hydrogen Energy. 2010;35:2713-2716
  47. 47. Qu Y, Zhou W, Ren Z, Du S, Meng X, Tian G, Pan K, Wang G, Fu H. Electronic structure and photocatalytic properties of copper-doped CaTiO3. Journal of Materials Chemistry. 2012;22:16471-16476
  48. 48. Li L, Zhang Y, Schultz AM, Liu X, Salvador PA, Rohrer GS. Visible light photochemical activity of heterostructured PbTiO3–TiO2 core–shell particles.  Catalysis Science & Technology. 2012;2:1945-1952
  49. 49. Feng Y-N, Wang H-C, Luo Y-D, Shen Y, Lin Y-H. Magnetic and photocatalytic behaviors of Ca Mn co-doped BiFeO3 nanofibres. Journal of Applied Physics. 2013;113:146101
  50. 50. Shi H, Li X, Iwai H, Zou Z, Ye J. 2-propanol photodegradation over nitrogen-doped NaNbO3 powders under visible-light irradiation.  Journal of Physics and Chemistry of Solids. 2009;70:931-935
  51. 51. Ding Q-P, Yuan Y-P, Xiong X, Li R-P, Huang H-B, Li Z-S, Yu T, Zou Z-G, Yang S-G. Enhanced photocatalytic water splitting properties of KNbO3 nanowires synthesized through hydrothermal method. Journal of Physical Chemistry C. 2008;112:18846-18848
  52. 52. Li G, Kako T, Wang D, Zou Z, Ye J. Enhanced photocatalytic activity of La-doped AgNbO3 under visible light irradiation. Dalton Transactions. 2009:2423-2427
  53. 53. Sang Y, Kuai L, Chen C, Fang Z, Geng B. Fabrication of a visible-light-driven plasmonic photocatalyst of AgVO3@AgBr@Ag nanobelt heterostructures. ACS Applied Materials & Interfaces. 2014;6:5061-5068
  54. 54. Barrocas B, Sério S, Rovisco A, Nunes Y, Melo Jorge ME. Removal of rhodamine 6G dye contaminant by visible light driven immobilized Ca1-xLnxMnO3 (Ln = Sm, Ho; 0.1 - x - 0.4) photocatalysts. Applied Surface Science. 2016;360:798-806
  55. 55. Li et al. One-dimensional perovskite manganite oxide nanostructures: Recent developments in synthesis, characterization, transport properties, and applications. Nanoscale Research Letters. 2016;11:121
  56. 56. Grabowska E. Selected perovskite oxides: Characterization, preparation and photocatalytic properties—A review. Applied Catalysis B: Environmental. 2016;186:97-126
  57. 57. Liang et al. Research progress on electronic phase separation in low-dimensional perovskite manganite nanostructures. Nanoscale Research Letters. 2014;9:325
  58. 58. Thirumalairajan S, Girija K, Mastelaro VR, Ponpandian N. Photocatalytic degradation of organic dyes under visible light irradiation by floral-like LaFeO3 nanostructures comprised of nanosheet petals. New Journal of Chemistry. 2014;38:5480-5490
  59. 59. Pena MA, Fierro JLG. Chemical structures and performance of perovskite oxides. Chemical Reviews. 2001;101:1981-2018
  60. 60. Ismail D, Bahnemann W, Robben L, Yarovyi V, Wark M. Palladium doped porous titania photocatalysts: Impact of mesoporous order and crystallinity. Chemistry of Materials. 2010;22:108-116
  61. 61. Ismail D, Bahnemann W, Bannat I, Wark M. Gold nanoparticles on mesoporous interparticle networks of titanium dioxide nanocrystals for enhanced photonic efficiencies. Journal of Physical Chemistry C. 2009;113:7429-7435
  62. 62. Shui M, Yue LH, Xu ZD. Effect of lanthanum doping on the photocatalytic activity of titanium dioxide. Acta Physico-Chimica Sinica. 2000;16:459-464
  63. 63. Li X, Zang JL. Facile hydrothermal synthesis of sodium tantalate (NaTaO3) nanocubes and high photocatalytic properties. Journal of Physical Chemistry C. 2009;113:19411-19418
  64. 64. Hu C, Tsai C, Teng H. Structure characterization and tuning of perovskite‐like NaTaO3 for applications in photoluminescence and photocatalysis. Journal of the American Ceramic Society. 2009;92:460-466
  65. 65. Mizoguchi H, Eng HW, Woodward PM. Probing the electronic structures of ternary perovskite and pyrochlore oxides containing Sn4+ or Sb5+. Inorganic Chemistry. 2004;43:1667-1680
  66. 66. Abdel-Latif IA et al. Impact of the annealing temperature on perovskite strontium doped neodymium manganites nanocomposites and their photocatalytic performances. Journal of the Taiwan Institute of Chemical Engineers. 2017;75:174-182
  67. 67. Demont A, Abanades S. High redox activity of Sr-substituted lanthanum manganite perovskites for two-step thermochemical dissociation of CO2. RSC Advances. 2014;4:54885-54891
  68. 68. Rossetti I, Allieta M, Biffi C, Scavini M. Oxygen transport in nanostructured lanthanum manganites. Physical Chemistry Chemical Physics. 2013;15:16779-16787
  69. 69. Voorhoeve RJH, Remeika JP, Freeland PE, Matthias BT. Rare-earth oxides of manganese and cobalt rival platinum for the treatment of carbon monoxide in auto exhaust. Science. 28, 1972;177(4046):353-354
  70. 70. Gupta P, Poddar P. Using raman and dielectric spectroscopy to elucidate the spin phonon and magnetoelectric coupling in DyCrO3 nanoplatelets. RSC Advances. 2015;5:10094-10101
  71. 71. Keav S, Matam SK, Ferri D, Weidenkaff A. Structured perovskite-based catalysts and their application as three-way catalytic converters—A review. Catalysts. 2014;4(3):226-255
  72. 72. Mierwaldt D, Mildner S, Arrigo R, Knop-Gericke A, Franke E, Blumenstein A, Hoffmann J, Jooss C. In: Situ XANES/XPS investigation of doped manganese perovskite catalysts. Catalysts. 2014;4(2):129-145
  73. 73. Madhavan B, Ashok A. Review on nanoperovskites: Materials, synthesis, and applications for proton and oxide ion conductivity. Ionics. 2015;21(3):601-610

Written By

Ihab A. Abdel-Latif

Submitted: 03 March 2018 Reviewed: 12 June 2018 Published: 05 November 2018