期刊
SMALL
卷 15, 期 39, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201903120
关键词
active sites; electrical conductivity; ferromagnetic perovskite oxides; super-exchange effect; water oxidation
类别
资金
- National Natural Science Foundation of China [21576135, 21706129, 21878158]
- Jiangsu Natural Science Foundation [BK20170043]
- Defense industrial technology development program [JCKY2018605B006]
- Max Planck-POSTECH-Hsinchu Center for Complex Phase Materials
- ARC [LE110100223]
Oxygen evolution reaction (OER) is crucial in many renewable electrochemical technologies including regenerative fuel cells, rechargeable metal-air batteries, and water splitting. It is found that abundant active sites with favorable electronic structure and high electrical conductivity play a dominant role in achieving high electrocatalytic efficiency of perovskites, thus efficient strategies need to be designed to generate multiple beneficial factors for OER. Here, highlighted is an unusual super-exchange effect in ferromagnetic perovskite oxide to optimize active sites and enhance electrical conductivity. A systematic exploration about the composition-dependent OER activity in SrCo1xRuxO3-delta (denoted as SCRx) (x = 0.0-1.0) perovskite is displayed with special attention on the role of super-exchange interaction between high spin (HS) Co3+ and Ru5+ ions. Induced by the unique Co3+-O-Ru5+ super-exchange interactions, the SCR0.1 is endowed with abundant OER active species including Co3+/Co4+, Ru5+, and O-2(2-)/O-, high electrical conductivity, and metal-oxygen covalency. Benefiting from these advantageous factors for OER electrocatalysis, the optimized SCR0.1 catalyst exhibits a remarkable activity with a low overpotential of 360 mV at 10 mA cm(-2), which exceeds the benchmark RuO2 and most well-known perovskite oxides reported so far, while maintaining excellent durability. This work provides a new pathway in developing perovskite catalysts for efficient catalysis.
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