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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)5804-5810
Journal / PublicationEnergy Procedia
Volume158
Publication statusPublished - Feb 2019

Conference

Title10th International Conference on Applied Energy (ICAE 2018)
PlaceChina
CityHong Kong
Period22 - 25 August 2018

Link(s)

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) 0.95 Mn0.5Fe0.5O3 (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) 0.95 MnO3 exhibited the highest ORR and OER activities and, hence, the best bifunctionality. After doping with Fe in the B-site, the (La0.8Sr0.2)0.95 Mn0.5Fe0.5O 3 perovskite exhibits even better electrochemical catalytic activity which is due to the increase of the concentration of oxygen vacancy as compared with (La0.8 Sr0.2) 0.95 MnO3 . Furthermore, (La0.8Sr0.2 )0.95 Mn0.5Fe0.5O3 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.

Research Area(s)

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

Citation Format(s)

La0.8Sr0.2MnO3 based perovskite with A-site deficiencies as high performance bifunctional electrocatalyst for oxygen reduction and evolution reaction in alkaline. / Yuan, Rong-hua; He, Yun; He, Wei; Ni, Meng; Leung, Michael K.H.

In: Energy Procedia, Vol. 158, 02.2019, p. 5804-5810.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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