Optimizing 3d spin polarization of CoOOH by in situ Mo doping for efficient oxygen evolution reaction
Zhichao Jia,
Yang Yuan,
Yanxing Zhang,
Xiang Lyu,
Chenhong Liu,
Xiaoli Yang,
Zhengyu Bai,
Haijiang Wang,
Lin Yang
Affiliations
Zhichao Jia
Key Laboratory of Green Chemical Media and Reactions, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Ministry of Education Henan Normal University Xinxiang Henan China
Yang Yuan
Key Laboratory of Green Chemical Media and Reactions, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Ministry of Education Henan Normal University Xinxiang Henan China
Yanxing Zhang
School of Physics Henan Normal University Xinxiang Henan China
Xiang Lyu
Oak Ridge National Laboratory Electrification and Energy Infrastructures Division Oak Ridge Tennessee USA
Chenhong Liu
Key Laboratory of Green Chemical Media and Reactions, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Ministry of Education Henan Normal University Xinxiang Henan China
Xiaoli Yang
Key Laboratory of Green Chemical Media and Reactions, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Ministry of Education Henan Normal University Xinxiang Henan China
Zhengyu Bai
Key Laboratory of Green Chemical Media and Reactions, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Ministry of Education Henan Normal University Xinxiang Henan China
Haijiang Wang
Department of Mechanical and Energy Engineering, Key Laboratory of Energy Conversion and Storage Technologies Southern University of Science and Technology Shenzhen Guangdong China
Lin Yang
Key Laboratory of Green Chemical Media and Reactions, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Ministry of Education Henan Normal University Xinxiang Henan China
Abstract Transition‐metal oxyhydroxides are attractive catalysts for oxygen evolution reactions (OERs). Further studies for developing transition‐metal oxyhydroxide catalysts and understanding their catalytic mechanisms will benefit their quick transition to the next catalysts. Herein, Mo‐doped CoOOH was designed as a high‐performance model electrocatalyst with durability for 20 h at 10 mA cm−2. Additionally, it had an overpotential of 260 mV (glassy carbon) or 215 mV (nickel foam), which was 78 mV lower than that of IrO2 (338 mV). In situ, Raman spectroscopy revealed the transformation process of CoOOH. Calculations using the density functional theory showed that during OER, doped Mo increased the spin‐up density of states and shrank the spin‐down bandgap of the 3d orbits in the reconstructed CoOOH under the electrochemical activation process, which simultaneously optimized the adsorption and electron conduction of oxygen‐related intermediates on Co sites and lowered the OER overpotentials. Our research provides new insights into the methodical planning of the creation of transition‐metal oxyhydroxide OER catalysts.
