Hydrothermal synthesis of layered CoS@WS 2 nanocomposite as a potential electrode for high-performance supercapacitor ap
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Hydrothermal synthesis of layered CoS@WS2 nanocomposite as a potential electrode for high‑performance supercapacitor applications T. N. V. Krishna1 · P. Himasree1 · K. V. G. Raghavendra1 · S. Srinivasa Rao2 · Naga Bhushanam Kundakarla3 · Dinah Punnoose4 · Hee‑Je Kim1 Received: 26 March 2020 / Accepted: 4 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Low cost and efficient one-step facile hydrothermal synthesis was used to synthesis CoS@WS 2 composite on the surface of nickel foam and evaluated as an electrode material for high-performance supercapacitors. Electrochemical impedance spectroscopy, galvanostatic charge–discharge tests, and cyclic voltammetry were used to evaluate the electrochemical characteristics of the CoS@WS2 electrode. A high-specific capacitance of 2442.32 F g −1 at a current density of 4.28 A g −1 was noted for CoS@WS2. The fabricated CoS@WS2 electrode material displayed acceptable rate capability (97.1% capacitance retention at a current density of 4.28 A g −1) and good cycling stability over 3000 charge–discharge cycles. The advanced electrochemical characteristics of CoS@WS2 were contributed to the synergistic effect and high surface area. The greater electrochemical performance of nanoparticles-like CoS@WS2 composite attracts their capacity to meet the requirements of applied electrochemical energy-loading applications. Over all, these results demonstrate that the synthesis of layered CoS@ WS2 could be a promising for applied electrochemical energy-loading applications.
1 Introduction Due to the increasing world’s population, the demand for energy storage as well as conservation is a vital concern in electrical industries [1]. Most researchers have taken special care of the development of a green and sustainable energy storage system [2]. There is a demand in the modern electronics industry for low-weight, high-efficiency reversal * T. N. V. Krishna [email protected] * Hee‑Je Kim [email protected] 1
School of Electrical Engineering, Pusan National University, Busandaehak‑ro 63 Beongil, Geumjeong‑gu, Busan 46241, South Korea
2
School of Mechanical and Mechatronics Engineering, Kyungsung University, 309 Suyeong‑ro, Nam‑Gu, Busan 48434, South Korea
3
Chemistry Department, Marquette University, Milwaukee, WI 53201, USA
4
Department of Computer Science and Engineering, Hindustan Institute of Technology and Science, Chennai 600016, India
stability, safety, and environmentally friendly energy storage devices such as supercapacitors (SCs) and lithium-ion batteries (Libs) [3]. LiBs and SCs attract researcher’s attention across the world. Based on the charge storage mechanism, SCs can be classified into two types such as electrochemical double-layer capacitors (EDLCs) and pseudocapacitors [4]. EDLCs store power by the charge separation at the interface between the electrolyte/electrode while pseudocapacitors have large energy density and high-specific capacitance than EDLCs due to its reversible faradaic redox reactions a
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