Parthiban Pazhamalai

By Parthiban Pazhamalai, Karthikeyan Krishnamoorthy and Sang-Jae Kim

This book chapter discusses the topochemical synthesis of blue titanium oxide (b-TiO2) and their application as electrode material for supercapacitor devices in aqueous and organic electrolytes. The formation mechanism of b-TiO2 via topochemical synthesis and their characterization using X-ray diffraction, UV–visible, photoluminescence, electron spin resonance spectroscopy, laser Raman spectrum, X-ray photoelectron spectroscopy, and morphological studies (FESEM and HR-TEM) are discussed in detail. The supercapacitive properties of b-TiO2 electrode were studied using both aqueous (Na2SO4) and organic (TEABF4) electrolytes. The b-TiO2 based symmetric-type supercapacitor (SC) device using TEABF4 works over a wide voltage window (3 V) and delivered a high specific capacitance (3.58 mF cm−2), possess high energy density (3.22 μWh cm−2) and power density (8.06 mW cm−2) with excellent cyclic stability over 10,000 cycles. Collectively, this chapter highlighted the use of b-TiO2 sheets as an advanced electrode for 3.0 V supercapacitors.

Part of the book: 21st Century Nanostructured Materials

By Karthikeyan Krishnamoorthy, Parthiban Pazhamalai, Rajavarman Swaminathan and Sang-Jae Kim

The development of wide temperature tolerance supercapacitors (SCs) with high specific energy without compromising specific power is an area of emerging interest owing to the increasing demands for electrochemical energy storage system (EES). This chapter discusses the preparation of siloxene-graphene (rGO) 2D/2D heterostructures (via chemical methods) and examines their potential utility toward SCs for electric vehicles (EVs). The electrochemical characterization of the siloxene-rGO SC showed that they possess high specific energy (55.79 Wh kg⁻¹), and specific power (15, 000 W kg⁻¹). And their ability to operate over a wide temperature range (−15 to 80°C), ensuring their suitability as an EES in EVs. The additional experimental studies suggested the ability of the solar-charged siloxene-rGO SC to drive an electric car, and it can capture the regenerative braking energy during the braking process. This chapter provides a new avenue toward the use of siloxene-rGO SC as a suitable EES for next-generation EVs.

Part of the book: Advances in Nanosheets