Cos Mediated Ni(Oh)2 Nanoflakes for Robust Supercapacitor and Methanol Electrocatalytic Oxidation

作     者：Wang, Guosheng Xu, Zhihua Li, Zhikun Ding, Yingjie Ge, Ruixiang Xiang, Ming Wang, Geming Yan, Zhaoxiong 

作者机构：State Key Laboratory of Precision Blasting Jianghan University Wuhan430056 China Hubei Key Laboratory of Industrial Fume and Dust Pollution Control Jianghan University Wuhan430056 China Provincial Key Laboratory of Plasma Chemistry and Advanced Materials Wuhan Institute of Technology Wuhan430073 China 

出 版 物：《SSRN》 

年 卷 期：2022年

核心收录：

主　　题：Nickel compounds 

摘      要：Heterojunction construction is a promising strategy to enhance the charge transfer efficiency, which subsequently optimizes the utilization of the electrode material. Herein, the constructed Ni(OH)2 nanosheets on ZIF-67-derived CoS core deposited on carbon cloth (CoS@Ni(OH)2/CC) possesses a superior performance (561.6 mA h g–1 at 1 A g–1) to Ni(OH)2/CC electrode (199.4 mA h g–1). Hybrid supercapacitor (HSC) with a CoS@Ni(OH)2/CC cathode and an active carbon (AC) anode (CoS@Ni(OH)2/CC//AC) provides a skyscraping energy density of 90.8 W h Kg–1 at 800 W Kg–1 and keeps 59.7 W h Kg–1 even at 25600 W Kg–1, higher than most of the reported Ni(OH)2-related device, and possesses a marvelous capacity retention of 92.2% over 10000 charge-discharge cycles. Concurrently, CoS@Ni(OH)2/CC as an efficient electrocatalyst displays an excellent electro-catalytic activity towards methanol oxidation. The outstanding electrochemical performance of CoS@Ni(OH)2/CC is chiefly due to the mediation of the Co2+/Co3+ redox cycle for the rapid conversion of Ni2+ into Ni3+, which greatly boosts the charge-transfer efficiency in the supercapacitors and methanol electro-oxidation. This work provides a rational way to obtain high-power electrode material for supercapacitors (SCs) and electrocatalytic methanol oxidation in direct methanol fuel cells (DMFCs). © 2022, The Authors. All rights reserved.