过电位
塔菲尔方程
析氧
化学
催化作用
氢氧化物
类金属
过渡金属
无机化学
钴
硫化物
氧化还原
氢氧化钴
分解水
金属氢氧化物
化学工程
金属
电化学
物理化学
有机化学
电极
工程类
光催化
作者
Dengfeng Qi,Ying Wang,Xinru Xu,Xiao Feng Jiang,Mushtaq Ahmad,Chenxiao Zhao,Zhenyi Yu,Meiling Lian,Yong Wang,Zhen Zhang
标识
DOI:10.1016/j.jelechem.2023.117619
摘要
Nanostructured transition metal sulfides (TMSs) have attracted great attention owing to their superior electric conductivity and easy redox reaction properties in oxygen evolution reaction (OER) catalysts. However, the strong metal-metalloid bonds (M−S) and metalloid-metalloid (SS) bonds in the crystal structure of TMSs are difficult to break, which might result in the insufficient formation of electrocatalytically active metal hydroxide species on the surface and prevent the realization of their full OER potential. Herein, we demonstrate an approach by sculpting Co(OH)2 on Co3S4 nanotubes (Co3S4/Co(OH)2) as highly reactive and stable electrocatalysts for efficient OER. The electron transfer between cobalt and sulfur and the pre-sculpted Co(OH)2 promote the formation of rich hydroxide active species on the surface of Co3S4/Co(OH)2. The optimized Co3S4/Co(OH)2–0.8 catalyst possesses excellent electrocatalytic activity for OER in an alkaline medium, with a relatively low OER overpotential of 269 mV (at 10 mA cm−2) and a Tafel slope of 95.2 mV dec-1. This work provides a new sight of designing TMS electrocatalysts for practical application in efficient water splitting.
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