塔菲尔方程
析氧
电催化剂
催化作用
电化学
化学工程
材料科学
纳米花
硫化物
铜
电化学能量转换
无机化学
化学
电极
冶金
物理化学
工程类
生物化学
作者
Jie Bai,Nana Lei,Limin Wang,Yaqiong Gong
出处
期刊:Nanoscale
[Royal Society of Chemistry]
日期:2022-01-01
卷期号:14 (48): 17976-17984
被引量:26
摘要
The electrocatalytic oxygen evolution reaction (OER) is an integral part and a stepping stone to various electrochemical technologies in the field of electrochemical energy conversion. The development of OER catalysts with low-cost materials, industry-related activity and long-term durability is highly needed, but remains challenging at this stage. In this paper, Cu ions in a copper foam (CF) substrate were replaced with Cu(OH)2 grown on CF to participate in the subsequent reaction, and then a subsequent two-step hydrothermal method was used to obtain the nanoflower-like Cu-Co-Zn trimetallic sulfide (named CuCoZn-S-3) catalyst, whose unique flower structure ensures that the catalyst surface exhibits a larger electrochemical active area, so as to expose plentiful active sites. The synergism between metals regulates the electron environment and accelerates the charge transfer rate, greatly improving the electrocatalytic activity of the catalyst. The prepared CuCoZn-S-3 exhibits excellent OER performance under alkaline conditions. It requires overpotentials of only 175 mV and 242 mV to drive current densities of 10 mA cm-2 and 100 mA cm-2, respectively. The Tafel slope of CuCoZn-S-3 is 62.3 mV dec-1. This study may provide a viable strategy for the rational preparation of low-cost and efficient OER electrocatalysts in alkaline medium.
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