La0.8Sr0.2MnO3 based perovskite with A-site deficiencies as high performance bifunctional electrocatalyst for oxygen reduction and evolution reaction in alkaline

Rong Hua Yuan, Yun He, Wei He, Meng Ni, Michael K.H. Leung

Research output: Journal article publicationConference articleAcademic researchpeer-review

5 Citations (Scopus)

Abstract

In this work, the A-site cation deficient perovskites (La0.8Sr0.2)1-xMnO3(x=0, 0.02, 0.05)(LSM) and Fe doped perovskite (La0.8Sr0.2)0.95Mn0.5Fe0.5O3(LSMF) are prepared by sol-gel process assisted with chelating effect of citric acid. The structure, morphology and valence state of the prepared samples were characterized. Their catalytic activities toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) were investigated by rotating-disk electrode (RDE). As expected, appropriate introduce of A-site deficiency can enhance both ORR and OER activities. Among the A-site cation deficient perovskites studied, (La0.8Sr0.2)0.95MnO3 exhibited the highest ORR and OER activities and, hence, the best bifunctionality. After doping with Fe in the B-site, the (La0.8Sr0.2)0.95Mn0.5Fe0.5O3 perovskite exhibits even better electrochemical catalytic activity which is due to the increase of the concentration of oxygen vacancy as compared with (La0.8Sr0.2)0.95MnO3. Furthermore, (La0.8Sr0.2)0.95Mn0.5Fe0.5O3 showed superior durability than commercial 20wt% Pt/C catalyst. This work indicates that introduce of A-site deficiency and B-site Fe doping in perovskite oxides is an effective strategy to enhance ORR and OER activity for the applications in metal-air batteries.

Original languageEnglish
Pages (from-to)5804-5810
Number of pages7
JournalEnergy Procedia
Volume158
DOIs
Publication statusPublished - Feb 2019
Event10th International Conference on Applied Energy, ICAE 2018 - Hong Kong, China
Duration: 22 Aug 201825 Aug 2018

Keywords

  • A-site deficiency
  • La0.8Sr0.2MnO3
  • Oxygen evolution reaction
  • Oxygen reduction reaction
  • Perovskite

ASJC Scopus subject areas

  • Energy(all)

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