超级电容器
材料科学
磷化物
硫化钴
双金属片
电容
硫化镍
镍
储能
硫化物
功率密度
化学工程
钴
纳米技术
电极
化学
冶金
金属
电化学
功率(物理)
物理化学
工程类
物理
量子力学
作者
Yingxia Dong,Xiaoqiu Yue,Yu Liu,Qiaoji Zheng,Zhiqin Cao,Dunmin Lin
标识
DOI:10.1016/j.jcis.2022.08.033
摘要
High-performance supercapacitors have attracted considerable interests due to their high-power density, fast charge/discharge process and long cycle life. However, the wide application of supercapacitors is limited by their low energy density. Herein, the hierarchical core-shell structured NiCoP@NiS nanoarrays have been successfully synthesized by using the vertically grown nickel-cobalt bimetallic phosphide (NiCoP) nanowire as the core and the nickel sulfide (NiS) by electrodeposition as the shell. As the "super channel" for electron transfer, the NiCoP core is coupled with the NiS shell to promote rapid diffusion of electrons and improve cycle stability of the electrode. Consequently, the optimized NiCoP@NiS nanoarrays display an extremely good specific capacitance (2128F g-1 at 1 A g-1) and a superior long cycle life (the capacitance retention of 90.36 % after 10,000 cycles). A hybrid supercapacitor (HSC) has been assembled using the NiCoP@NiS as the positive and the activated carbon (AC) as the negative, which displays a superior energy density of 30.47 Wh kg-1 at a remarkable power energy of 800 W kg-1. This study shows that the prepared hierarchical core-shell structured nanoarrays have great prospects as a novel electrode material in energy storage.
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