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Breaking the Activity‐Stability Trade‐Off of RuO 2 via Metallic Ru Bilateral Regulation for Acidic Oxygen Evolution Reaction
Author(s) -
Lu Qian,
Liu Jinjie,
Zou Xiaohong,
Huang Birou,
Wu Weixing,
Yin Jun,
Liu ZhaoQing,
Wang Ying
Publication year - 2025
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202503733
Subject(s) - oxygen evolution , oxygen , metal , chemistry , ruthenium , catalysis , inorganic chemistry , chemical engineering , organic chemistry , electrochemistry , engineering , electrode
Abstract Developing highly efficient acidic oxygen evolution reaction (OER) electrocatalysts is crucial for proton exchange membrane water electrolyzer. RuO 2 electrocatalysts, which followed a kinetically favorable lattice oxygen mechanism, perform a preferable intrinsic activity, but poor stability for acidic OER. Recent work often sacrifices the intrinsic activity of RuO 2 to enhance stability. The balance between the activity and stability of RuO 2 ‐based catalysts is still overlooked in current research. Here, we report a controlled method to introduce metallic Ru onto RuO 2 catalysts to form the Ru 4+ ─O─Ru 0 interfacial structure for decreasing the Ru 4+ oxidation state and promoting deprotonation kinetics. Metallic Ru can serve as the electron donor to lower the oxidation state of *V o ‐RuO 4 2− in Ru/RuO 2 for stabilizing the structure of *V o ‐RuO 4 2− ‐Ru/RuO 2 to favour the acidic OER stability. Moreover, the deprotonation kinetics via the interfacial oxygen site between Ru 4+ and Ru 0 is significantly enhanced on Ru/RuO 2 catalysts to improve the acidic OER activity. This work offers a unique perspective to balance the acidic OER activity and stability of RuO 2 .