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Electrochemically generated electrophilic peroxo species accelerates alkaline oxygen evolution reaction

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Title
Electrochemically generated electrophilic peroxo species accelerates alkaline oxygen evolution reaction
Author(s)
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; Kangmin Suh; Young Seong Kim; Lee, Kug-Seung; Yoo, Sung Jong; Yung-Eun Sung; Taeghwan Hyeon
Publication Date
2023-08
Journal
Joule, v.7, no.8, pp.1902 - 1919
Publisher
Cell Press
Abstract
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. © 2023 Elsevier Inc.
URI
https://pr.ibs.re.kr/handle/8788114/14400
DOI
10.1016/j.joule.2023.06.018
ISSN
2542-4351
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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