析氧
化学
氧化还原
催化作用
电解
氢氧化物
电化学
无机化学
电泳剂
碱性水电解
过氧化氢
钨酸盐
分解水
阳极
电解水
电解质
电极
物理化学
有机化学
光催化
作者
Hyeon Seok Lee,Hyun-Seop Shin,Subin Park,Jiheon Kim,Euiyeon Jung,Wooncheol Hwang,Byoung‐Hoon Lee,Ji Mun Yoo,Wytse Hooch Antink,Kangjae Lee,Seongbeom Lee,Geumbi Na,Kahp Y. Suh,Young Seong Kim,Kug‐Seung Lee,Sung Jong Yoo,Yung‐Eun Sung,Taeghwan Hyeon
出处
期刊:Joule
[Elsevier]
日期:2023-08-01
卷期号:7 (8): 1902-1919
被引量:2
标识
DOI:10.1016/j.joule.2023.06.018
摘要
Summary
Introducing a new redox cycle into (electro)catalysts can activate reactants, enabling novel functionality. Here, we report that early transition metals (TMs) with vacant d orbitals (d0-oxoanions) directly participate in and accelerate the alkaline oxygen evolution reaction (OER) via a redox cycle associated with early TM-peroxo species [M-(O2)2−]. Interestingly, the metal-peroxo cycles both induced by hydrogen peroxide (H2O2) and OER intermediates have similar characteristics, making it possible to modulate the OER performance using d0-oxoanions that react with H2O2 as enhancers. This principle was successfully integrated into practical electrolysis systems with the anode side extended to typical OER catalysts. Among them, tungstate-modified iron-nickel (oxy)hydroxide (W/FeNiOOH) exhibited current densities of 7.87 and 4.26 A cmgeo−2 at 2.0 Vcell in water electrolysis while running in 1.0 M KOH and 1.0 wt % K2CO3 electrolyte, respectively. Our finding provides universal platforms demonstrating a controllable strategy toward electrochemical oxygen activation using the electrophilic peroxo cycle.
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