电催化剂
析氧
材料科学
再分配(选举)
电化学
氧气
扩散
化学物理
化学工程
纳米技术
电极
物理化学
化学
热力学
工程类
法学
有机化学
物理
政治
政治学
作者
Yawen Dai,Jie Yu,Zhenbao Zhang,Chun Hu Cheng,Peng Tan,Zongping Shao,Meng Ni
标识
DOI:10.1021/acsami.0c21859
摘要
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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