过电位
塔菲尔方程
超级电容器
电化学
电容
材料科学
电极
化学工程
电流密度
纳米技术
化学
物理化学
量子力学
物理
工程类
作者
Xueying Cao,Dedong Jia,Da Li,Liang Cui,Jingquan Liu
标识
DOI:10.1016/j.cej.2018.04.209
摘要
Considering the synergistic effect of transition metal phosphides and 3D structure substrates, herein, we directly deposited well-defined hierarchical radial NixP nanospheres on Ni foam via a facile, one-step co-electrochemical method to function as highly active flexible electrodes for both hydrogen evolution reaction and supercapacitor. Impressively, the bifunctional NixP/NF electrode requires an overpotential of only 63 mV to achieve a current density of 10 mA cm−2 and demonstrates a low Tafel slop of 55 mV dec−1 in 1 M KOH. Moreover, the electrochemical supercapacitor based on this hierarchical NixP/NF electrode also shows a superior specific capacitance of 1684 mF cm−2 (382.7 F/g) at a current density of 2 mA cm−2 and an outstanding retention ratio of 110.9% of its original capacitance value after 4000 cycles in 6 M KOH. Hopefully, excellent electrochemical performances demonstrate that this NixP/NF material could be a promising candidate for future applications in both hydrogen evolution reactions and supercapacitors.
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