Electrocatalytic Water Oxidation Activity-Stability Maps for Perovskite Oxides Containing 3d, 4d and 5d Transition Metals |
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| Authors: | Dr Xiao Liang Prof Wensheng Yan Yinglong Yu Kexin Zhang Wei An Prof Hui Chen Prof Yongcun Zou Prof Xiao Zhao Prof Xiaoxin Zou |
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| Institution: | 1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 130012 Changchun, China;2. National Synchrotron Radiation Laboratory, University of Science and Technology of China, 230029 Hefei, China;3. Petrochemical Research Institute, PetroChina, 102206 Beijing, China;4. School of Materials Science and Engineering, Key Laboratory of Automobile Materials of MOE, State Key Laboratory of Automotive Simulation and Control, Electron Microscopy Center, Jilin University, 130012 Changchun, China |
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| Abstract: | Improving catalytic activity without loss of catalytic stability is one of the core goals in search of low-iridium-content oxygen evolution electrocatalysts under acidic conditions. Here, we synthesize a family of 66 SrBO3 perovskite oxides (B=Ti, Ru, Ir) with different Ti : Ru : Ir atomic ratios and construct catalytic activity-stability maps over composition variation. The maps classify the multicomponent perovskites into chemical groups with distinct catalytic activity and stability for acidic oxygen evolution reaction, and highlights a chemical region where high catalytic activity and stability are achieved simultaneously at a relatively low iridium level. By quantifying the extent of hybridization of mixed transition metal 3d-4d-5d and oxygen 2p orbitals for multicomponent perovskites, we demonstrate this complex interplay between 3d-4d-5d metals and oxygen atoms in governing the trends in both activity and stability as well as in determining the catalytic mechanism involving lattice oxygen or not. |
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| Keywords: | Electrocatalysis Hybridization Iridium Oxygen Evolution Reaction Perovskite |
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