Interfacial la diffusion in the CeO2/LaFeO3hybrid for enhanced oxygen evolution activity

Yawen Dai, Jie Yu, Zhenbao Zhang, Chun Cheng, Peng Tan, Zongping Shao, Meng Ni

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)2799-2806
Number of pages8
JournalACS Applied Materials and Interfaces
Volume13
Issue number2
DOIs
Publication statusPublished - 20 Jan 2021

Keywords

  • elemental redistribution
  • interface engineering
  • oxygen evolution
  • perovskite oxide

ASJC Scopus subject areas

  • Materials Science(all)

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