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,Heejong Shin,Subin Park,Jiheon Kim,Euiyeon Jung,Wonchan 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:8
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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