析氧
催化作用
氧气
电催化剂
材料科学
电化学
枝晶(数学)
化学工程
氧还原反应
化学
物理化学
电极
有机化学
工程类
数学
几何学
作者
Tingting Zhou,Zhen Cao,Xi–Shi Tai,Lei Yu,Jian Ouyang,Yunfei Li,Jitao Lü
出处
期刊:Polymers
[MDPI AG]
日期:2022-04-08
卷期号:14 (8): 1510-1510
被引量:5
标识
DOI:10.3390/polym14081510
摘要
It is critical to develop efficient oxygen evolution reaction (OER) catalysts with high catalytic properties for overall water splitting. Electrocatalysts with enriched vacancies are crucial for enhancing the catalytic activity of OER through defect engineering. We demonstrated the dealloying method in a reducing alkaline solution using the Co5Al95 alloy foil as a precursor to produce a new oxygen-vacancy-rich cobalt hydroxide (OV-Co(OH)2) hierarchical dendrite. The as-synthesised OV-Co(OH)2 showed superior electrocatalytic activities toward OER when compared to pristine cobalt hydroxide (p-Co(OH)2), which had a low onset overpotential of only 242 mV and a small Tafel slope of 64.9 mV dec-1. Additionally, for the high surface area provided by the hierarchical dendrite, both p-Co(OH)2 and OV-Co(OH)2 showed a superior activity as compared to commercial catalysts. Furthermore, they retained good catalytic properties without remarkably decaying at an overpotential of 350 mV for 12 h. The as-made OV-Co(OH)2 has prospective applications as an anode electrocatalyst in electrochemical water-splitting technologies with the advantages of superior OER performances, large surface area and ease of preparation.
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