Dual-Site Cobalt-Doped RuO <sub>2</sub> /TiO <sub>2</sub> Electrocatalyst Enables Stable and Cost-Efficient Acidic Oxygen Evolution for PEM Water Electrolysis
Developing efficient, cost-effective, and durable electrocatalysts for proton exchange membrane water electrolysis (PEMWE) remains a significant challenge, requiring the stabilization and enhancement of catalyst activity under harsh conditions. Here, we present cobalt-doped ruthenium dioxide (Co<sub>0.3</sub>Ru<sub>0.7</sub>O<sub>2</sub>) on TiO<sub>2</sub> as an electrocatalyst toward an acidic oxygen evolution reaction. The Co<sub>0.3</sub>Ru<sub>0.7</sub>O<sub>2</sub>-TiO<sub>2</sub> achieves an impressive overpotential of 322 mV at 1 A cm<sup>-2</sup> and demonstrates stable operation for over 1000 h at 500 mA cm<sup>-2</sup> in a PEMWE device. Comprehensive experimental and theoretical calculation results demonstrate that the doping of Co atoms into the rutile RuO<sub>2</sub> lattice optimizes the geometric configuration. Moreover, the lattice-matched interface between Co<sub>0.3</sub>Ru<sub>0.7</sub>O<sub>2</sub> and TiO<sub>2</sub> promotes interfacial electron redistribution and stabilizes active centers under oxidative conditions. This facilitates a dual-site fully parallel oxidation (DFO) pathway in which intermediates are synchronously adsorbed and desorbed at Ru and Co sites, enabling direct <i>O-O</i> coupling. This work highlights the synergistic effect of the Ru-Co dual sites and TiO<sub>2</sub> support in establishing a stable, self-regulating electronic environment that drives efficient intermediate transformation via the DFO mechanism.
Authors
- Ke Xu (ORCID: https://orcid.org/0000-0001-5855-3810)
- Yong Han (ORCID: https://orcid.org/0000-0002-9096-6516)
- Zhangquan Peng (ORCID: https://orcid.org/0000-0002-4338-314X)
- Chenyu Yang (ORCID: https://orcid.org/0000-0002-5000-3408)
- Jinxuan Liu (ORCID: https://orcid.org/0000-0002-6306-1359)
- Xueliang Mu (ORCID: https://orcid.org/0000-0003-1827-3018)
- Shu Zhu (ORCID: https://orcid.org/0000-0002-4239-2781)
- Edmund C. M. Tse (ORCID: https://orcid.org/0000-0002-9313-1290)
- Yuanyuan Zhao (ORCID: https://orcid.org/0000-0002-0196-7673)
- Zhiwei Zhao (ORCID: https://orcid.org/0000-0002-0378-2744)
- Fei Li (ORCID: https://orcid.org/0000-0002-3686-7576)
- Qing Li (ORCID: https://orcid.org/0000-0003-4807-030X)
- Qinghua Liu (ORCID: https://orcid.org/0000-0003-4090-3311)
- Wei Liu (ORCID: https://orcid.org/0000-0002-4403-737X)
- Liang Frank Wang (ORCID: https://orcid.org/0000-0002-3771-4627)
- Jian‐Feng Li (ORCID: https://orcid.org/0000-0003-1598-6856)
- Zhi Liu (ORCID: https://orcid.org/0000-0002-8973-6561)
- Jing Liang (ORCID: https://orcid.org/0000-0003-0811-0223)
- Junfeng Gao (ORCID: https://orcid.org/0000-0001-5732-9905)
Institutions
- University of Science and Technology of China (CN)
- China National Offshore Oil Corporation (China) (CN)
- Dalian Institute of Chemical Physics (CN)
- Xiamen University (CN)
- Chinese Academy of Sciences (CN)
- China University of Petroleum, Beijing (CN)
- Dalian University of Technology (CN)
- ShanghaiTech University (CN)
- China Resources (China) (CN)
- Dalian University (CN)
- Materials Modification (United States) (US)
- Suzhou Research Institute (CN)
- Division of Materials Science and Engineering (AU)
- Ministry of Education (ET)
- National Synchrotron Radiation Laboratory (CN)
- Lithium Power (United States) (US)
- Collaborative Innovation Center of Chemistry for Energy Materials (CN)
- Joint Research Centre (NL)
- State Key Laboratory of Materials Processing and Die & Mould Technology (CN)
- Huazhong University of Science and Technology (CN)
- University of Hong Kong (HK)
Publication Details
- Journal
- Journal of the American Chemical Society
- Published
- 2025-09-24
- DOI
- https://doi.org/10.1021/jacs.5c14137
- Citations
- 20
- Primary Topic
- Electrocatalysts for Energy Conversion
- Type
- article
- Field-Weighted Citation Impact
- 7.27