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    Significant capacitance enhancement induced by cyclic voltammetry in pine needle-likeNi-Co-Cu multicomponent electrode

    Year: 2021

    Journal: J. Mater. Sci. Technol., Volume 78, JUL 10, page 100–109

    Authors: Xu, Liqianyun; Zhang, Liuyang; Cheng, Bei; Yu, Jiaguo; Al-Ghamdi, Ahmed A.; Wageh, S.

    Organizations: National Natural Science Foundation of China [21801200, 21871217, U1905215and 51872220]; Fundamental Research Funds for the Central Universities [WUT: 2019IVB050, 182459018, 195201044]; Project of Deanship of Scientific Research (DSR) at King Abdulaziz University, Jeddah, Saudi Arabia [FP-179-42]

    Keywords: Cyclic voltammetry; Ni-Co-Cu ternary composite; Ion exchange; Supercapacitor

    Poor conductivity and rate capability are the obstacles faced by nickel-cobalt composites as electrode materials for supercapacitor application. Herein, simple electrochemical treatment conducted by cyclic voltammetry is applied and the overall performance of the active material is considerably enhanced. We discover that this treatment triggers the formation of Ni-Co-Cu ternary composite and optimizes the crystal structure of the untreated counterpart. The areal capacitance of the treated sample rockets up to 6.13 F cm(-2) at 2 mA cm(-2), almost 13 times higher than the untreated ones. Besides, the resistance is substantially reduced by cyclic voltammetry treatment. Moreover, the Coulombic efficiency and stability are concurrently elevated. The reasons behind this treatment are mulled over and reasonable hypothesis is suggested. This study provides a cheap and effortless way to reform the structures of as-obtained samples as well as vigorously raise the performance of current available materials. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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