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

doi:10.1021/acsami.0c21859

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 publication › Journal article › Academic research › peer-review

42 Citations (Scopus)

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 language	English
Pages (from-to)	2799-2806
Number of pages	8
Journal	ACS Applied Materials and Interfaces
Volume	13
Issue number	2
DOIs	https://doi.org/10.1021/acsami.0c21859
Publication status	Published - 20 Jan 2021

Keywords

elemental redistribution
interface engineering
oxygen evolution
perovskite oxide

ASJC Scopus subject areas

General Materials Science

More information

10.1021/acsami.0c21859

http://hdl.handle.net/10397/97570

Cite this

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title = "Interfacial la diffusion in the CeO2/LaFeO3hybrid for enhanced oxygen evolution activity",

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. ",

keywords = "elemental redistribution, interface engineering, oxygen evolution, perovskite oxide",

author = "Yawen Dai and Jie Yu and Zhenbao Zhang and Chun Cheng and Peng Tan and Zongping Shao and Meng Ni",

note = "Funding Information: M.N. acknowledges the funding support (Project Number: PolyU 152214/17E and PolyU 152064/18E) from Research Grant Council, University Grants Committee, Hong Kong SAR. Y. D. is supported by the PhD Fellowship of Research Grant Council, University Grant Committee, HK SAR. We also thank Shiyanjia Lab ( www.shiyanjia.com ) for the help in conducting STEM-EELS characterization. Publisher Copyright: {\textcopyright} Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",

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AU - Tan, Peng

AU - Shao, Zongping

AU - Ni, Meng

N1 - Funding Information: M.N. acknowledges the funding support (Project Number: PolyU 152214/17E and PolyU 152064/18E) from Research Grant Council, University Grants Committee, Hong Kong SAR. Y. D. is supported by the PhD Fellowship of Research Grant Council, University Grant Committee, HK SAR. We also thank Shiyanjia Lab ( www.shiyanjia.com ) for the help in conducting STEM-EELS characterization. Publisher Copyright: © Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/1/20

Y1 - 2021/1/20

N2 - 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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