Morphology-controlled synthesis of one-dimensional zinc molybdate nanorods for high-performance pseudocapacitor electrod
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ORIGINAL PAPER
Morphology‑controlled synthesis of one‑dimensional zinc molybdate nanorods for high‑performance pseudocapacitor electrode application Harichandran Gurusamy1 · Radha Sivasubramanian1 · Yesuraj Johnbosco2 · Muthuraaman Bhagavathiachari2 Received: 10 July 2020 / Accepted: 4 November 2020 © Institute of Chemistry, Slovak Academy of Sciences 2020
Abstract Nanorod-shaped Zinc molybdate ( ZnMoO4) materials have been prepared using a cetyl-trimethylammonium bromide (CTAB) template-assisted hydrothermal synthesis, followed by subsequent calcination process. The morphology and size of the ZnMoO4 can be altered by adjusting the concentration of CTAB. The optimal concentration of CTAB provides nanorodshaped ZnMoO4, which accordingly determines the electrochemical features of prepared supercapacitor electrodes. The electrochemical properties were examined using cyclic voltammetric (CV) and chronopotentiometric (CP) techniques. The cyclic voltammetric studies confirm the pseudocapacitor mechanism with the specific capacitance of 779 Fg−1 at a scan rate of 5 mVs−1. Furthermore, the chronopotentiometric studies deliver the specific capacitance of 540 Fg−1 at a current density of 1 Ag−1. Besides, the ZnMoO4 demonstrated outstanding cyclic stability and the capacitance retention of about 90% was observed even after continuous 3000 cycles at a scan rate of 100 mVs−1. This endeavor demonstrated an important promising approach to synthesize Z nMoO4 nanorods with high specific capacitance, rate capability and superior cycle stability, which have attractive interest to be the candidate for electrode materials towards high-performance supercapacitor applications. Keywords ZnMoO4 nanorod · Energy storage · Supercapacitors · CTAB · Hydrothermal
Introduction In the present electronic society, the electrical energy storage is the critical factor since all the traditional energy resources are getting vanished. In addition, the environmental pollution and global warming issues has considerably raised the demand for energy storage devices (An et al. 2018, 2019, 2020; Zhai et al. 2018). To overcome this problem, people have been looking for highly capable appropriate approaches to fabricate energy conversion and storage system, whereas maintaining the eco-system and environment (Simon 2008; Chu and Majumdar 2012; Lai et al. 2012; Zhang and Huang 2017). Among the energy storage devices, supercapacitors are promising owing to their collective features of high * Harichandran Gurusamy [email protected] 1
Department of Polymer Science, University of Madras, Guindy Campus, Chennai 600 025, India
Department of Energy, University of Madras, Guindy Campus, Chennai 600 025, India
2
power and moderated energy density, and it fill the gap between conventional capacitors and batteries (Li et al. 2016a, b, 2017). Interestingly, supercapacitors possess great features like rapid charging/discharging, superior rate capability, long operating lifetimes, and cost effective (ElKady et al. 2012; Nagaraju et al. 2014; Zhai et al. 201
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