期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 13, 页码 7418-7425出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202015060
关键词
Co-based materials; controllable leaching; OER; site occupancy; surface reconstruction
资金
- Singapore MOE Tier 2 [MOE2018-T2-2-027]
- Singapore National Research Foundation under its Campus for Research Excellence and Technological Enterprise (CREATE) programme
A rational design for oxygen evolution reaction (OER) catalysts is important for water electrolysis efficiency. This study demonstrates controlled anodic leaching of Cr in CoCr2O4 material to transform inactive spinel CoCr2O4 into a highly active catalyst, showcasing the significance of controlling anodic potential in modifying electrocatalyst surface chemistry.
A rational design for oxygen evolution reaction (OER) catalysts is pivotal to the overall efficiency of water electrolysis. Much work has been devoted to understanding cation leaching and surface reconstruction of very active electrocatalysts, but little on intentionally promoting the surface in a controlled fashion. We now report controllable anodic leaching of Cr in CoCr2O4 by activating the pristine material at high potential, which enables the transformation of inactive spinel CoCr2O4 into a highly active catalyst. The depletion of Cr and consumption of lattice oxygen facilitate surface defects and oxygen vacancies, exposing Co species to reconstruct into active Co oxyhydroxides differ from CoOOH. A novel mechanism with the evolution of tetrahedrally coordinated surface cation into octahedral configuration via non-concerted proton-electron transfer is proposed. This work shows the importance of controlled anodic potential in modifying the surface chemistry of electrocatalysts.
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