Lee, Hyeon Seok Shin, Heejong Park, Subin Kim, Jiheon Jung, Euiyeon Hwang, Wonchan Lee, Byoung-Hoon Yoo, Ji Mun Antink, Wytse Hooch Lee, Kangjae Lee, Seongbeom Na, Geumbi Suh, Kangmin Kim, Young Seong Lee, Kug-Seung Yoo, Sung Jong Sung, Yung-Eun Hyeon, Taeghwan 2024-01-19T09:01:15Z 2024-01-19T09:01:15Z 2023-10-29 2023-08 2542-4351 https://pubs.kist.re.kr/handle/201004/113377 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. English CELL PRESS Electrochemically generated electrophilic peroxo species accelerates alkaline evolution reaction Article 10.1016/j.joule.2023.06.018 1 Joule, v.7, no.8, pp.1902 - 1919 Joule 7 8 1902 1919 N scie scopus 001076600400001 2-s2.0-85167789345 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article OXYGEN-EVOLUTION METAL-OXIDES ACTIVE-SITE COMPLEXES CATALYST ELECTROCATALYSTS OXIDATION TUNGSTATE HYDROGEN Yung-Eun Sung Taeghwan electrochemical reactions