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Doping Ti into RuO<sub>2</sub> to Accelerate Bridged‐Oxygen‐Assisted Deprotonation for Acidic Oxygen Evolution Reaction

Wei HuKey Laboratory of Advanced Catalysis, Gansu province State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou Gansu 730000 ChinaBolong HuangDepartment of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong SAR 100872 ChinaMingzi SunDepartment of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong SAR 100872 ChinaJing DuKey Laboratory of Advanced Catalysis, Gansu province State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou Gansu 730000 ChinaYang HaiSchool of Mechanical Engineering Dongguan University of Technology Dongguan Guangdong 523000 ChinaWen YinUniversity of Chinese Academy of Sciences Beijing 101408 ChinaXiaomei WangKey Laboratory of Advanced Catalysis, Gansu province State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou Gansu 730000 ChinaWensheng GaoKey Laboratory of Advanced Catalysis, Gansu province State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou Gansu 730000 ChinaChunyang ZhaoKey Laboratory of Advanced Catalysis, Gansu province State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou Gansu 730000 ChinaYinghong YueKey Laboratory of Advanced Catalysis, Gansu province State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou Gansu 730000 ChinaZelong LiKey Laboratory of Advanced Catalysis, Gansu province State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou Gansu 730000 ChinaCan LiKey Laboratory of Advanced Catalysis, Gansu province State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou Gansu 730000 China

2024en

ABI

Annotatsiya

Abstract The development of efficient and durable electrocatalysts for the acidic oxygen evolution reaction (OER) is essential for advancing renewable hydrogen energy technology. However, the slow deprotonation kinetics of oxo‐intermediates, involving the four proton‐coupled electron steps, hinder the acidic OER progress. Herein, a RuTiO x solid solution electrocatalyst is investigated, which features bridged oxygen (O bri ) sites that act as proton acceptors, accelerating the deprotonation of oxo‐intermediates. Electrochemical tests, infrared spectroscopy, and density functional theory results reveal that the moderate proton adsorption energy on O bri sites facilitates fast deprotonation kinetics through the adsorbate evolution mechanism. This process effectively prevents the over‐oxidation and deactivation of Ru sites caused by the lattice oxygen mechanism. Consequently, RuTiO x shows a low overpotential of 198 mV at 10 mA cm −2 geo and performance exceeding 1400 h at 50 mA cm −2 geo with negligible deactivation. These insights into the OER mechanism and the structure‐function relationship are crucial for the advancement of catalytic systems.

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DOI: 10.1002/adma.202411709

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