期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 2, 页码 2799-2806出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c21859
关键词
oxygen evolution; interface engineering; elemental redistribution; perovskite oxide
资金
- Research Grant Council, University Grants Committee, Hong Kong SAR [PolyU 152214/17E, PolyU 152064/18E]
- Research Grant Council, University Grant Committee, HK SAR
The development of a CeO2/LaFeO3 hybrid electrocatalyst for enhanced OER activity was reported, demonstrating a selective interfacial La diffusion as a mechanism for activity enhancement. This finding may be extended to other hybrid systems, inspiring the design of more efficient electrocatalysts.
The electrochemical oxygen evolution reaction (OER) is of great significance for energy conversion and storage. The hybrid strategy is attracting increasing interest for the development of highly active OER electrocatalysts. Regarding the activity enhancement mechanism, electron coupling between two phases in hybrids has been widely reported, but the interfacial elemental redistribution is rarely investigated. Herein, we developed a CeO2/LaFeO3 hybrid electrocatalyst for enhanced OER activity. Interestingly, a selective interfacial La diffusion from LaFeO3 to CeO2 was demonstrated by the electron energy loss spectra and elemental mapping. This redistribution of cations triggers the change of the chemical environment of interface elements for charge compensation because of the electroneutrality principle, which results in increased oxygen vacancies and high-valent Fe species that promote the OER electrocatalysis. This mechanism might be extended to other hybrid systems and inspire the design of more efficient electrocatalysts.
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