| Abstract Scope |
In certain oxide electrocatalysts, high-valence metal sites (such as molybdenum oxide) are often not the true active centers for electrocatalytic reactions, primarily due to their poor intermediate adsorption behavior. As proof of concept, we can select molybdenum oxide as a representative model catalyst, where the intrinsic molybdenum sites are not favorable active centers. By introducing anion doping, such as N/P/B regulation through defect engineering and phase engineering, the inactive molybdenum sites can be regenerated into synergistic active centers that promote OER. Through a comprehensive comparison, it was found that the OER performance of oxide catalysts is highly correlated with phosphorus sites and molybdenum/oxygen defects. Additionally, B/N doping can induce phase changes in molybdenum oxide that are more favorable for OER. This work is expected to provide insights into enhancing electrocatalytic performance by activating inert metal sites on oxide catalysts to enrich metal active sites. |