The method of introducing oxygen vacancy into La0.8Sr0.2FeO3-based catalyst: enhancing the ORR and OER performance

Sile YU, Ziyi SHUI, Chenghua WANG, Yuan LEI, Yilun LIU, Wei ZHAO, Xi CHEN

Research output: Journal PublicationsJournal Article (refereed)peer-review

5 Citations (Scopus)

Abstract

Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) have been widely used in energy conversion devices; therefore, the demand for corresponding catalysts is increasing each year. Pt and IrO2 are considered to be the most advanced ORR and OER catalysts; however, these expensive precious metal catalysts hinder their extensive application in practical applications. Herein, a series of La0.8Sr0.2FeO3-based perovskite catalysts (La0.8Sr0.2FeO3-PEI, La0.8Sr0.2FeO3-Fe2O3, La0.8Sr0.2FeO3) have been created by sol–gel method to achieve highly efficient catalytic performance for ORR and OER and these perovskite oxides stand out with raw material availability to substitute noble metal as bi-functional composite catalysts. The superior ORR performance (the onset potential is 1.061 V and the half-wave potential is 0.672 V), significant enhancement of OER performance (the onset potential is 1.553 V and current density is 5.53 mA cm−2 at 1.8 V) and the electron transfer number (3.69) of La0.8Sr0.2FeO3-PEI are significantly higher than those of two others, which benefited from the introducing of carbon in the preparation of perovskite, increasing the oxygen vacancy concentration on the surface of the catalyst, adsorbing more highly reactive oxygen species O22−/O, and enhancing the ORR and OER performance of the catalyst. This article suggests that carbon introducing is a promising strategy to improve the electrocatalytic activity for ORR and OER. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
Original languageEnglish
Pages (from-to)12364-12376
Number of pages13
JournalJournal of Materials Science
Volume57
Issue number26
DOIs
Publication statusPublished - 2022
Externally publishedYes

Bibliographical note

Funding is provided by National Natural Science Foundation of China (Grant No. 11872302).

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