Vanadium-induced fragmentation of crystalline CoFe hydr(oxy)oxide electrocatalysts for enhanced oxygen evolution reaction

被引：27
作者：
Adamson, William [1 ]
Jia, Chen [1 ]
Li, Yibing [1 ]
Zhao, Chuan [1 ]
机构：
[1] Univ New South Wales, Sch Chem, Sydney, NSW 2052, Australia
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2021年 / 46卷 / 71期
基金：
澳大利亚研究理事会;
关键词：
Vanadium doping; Metal hydr(oxy)oxide; Oxygen evolution reaction; Water splitting; Electrocatalysis; COBALT-IRON OXYHYDROXIDE; EFFICIENT; NANOSHEET; CATALYST; NICKEL; GROWTH; ARRAYS;
D O I：
10.1016/j.ijhydene.2021.08.080
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Transition metal hydr(oxy)oxides are one of the most efficient electrocatalysts towards oxygen evolution reaction (OER). However, structural-dependant and low stability severely hinder their overall performance and catalytic efficiency. Herein, we report the enhancement of OER activity via vanadium doping into the CoFe hydr(oxy)oxide electrocatalyst (denoted as CoFeV). Our results show that the incorporation of vanadium induces fragmentation of the polycrystalline structure of the CoFe hydr(oxy)oxide (CoFe) and transformation to a more active amorphous structure, greatly exposing the CoO and FeOOH active sites on the surface for OER. The optimised electrocatalyst exhibits an overpotential of 376 mV to reach a current density of 10 mA cm(-2) and requires a small Tafel slope of 26 mV dec(-1) for OER in alkaline media. These results illustrate that vanadium doping can efficiently improve the catalytic activity of CoFeV which can be extended to other vanadium-doped transition metal hydr(oxy)oxides as promising electrocatalysts for OER applications. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：35230 / 35238
页数：9
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