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

doi:10.1016/j.egypro.2019.01.548

La_0.8Sr_0.2MnO₃ 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^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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Abstract

In this work, the A-site cation deficient perovskites (La_0.8Sr_0.2)_1-xMnO₃(x=0, 0.02, 0.05)(LSM) and Fe doped perovskite (La_0.8Sr_0.2) _0.95 Mn_0.5Fe_0.5O₃ (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, (La_0.8Sr_0.2) _0.95 MnO₃ exhibited the highest ORR and OER activities and, hence, the best bifunctionality. After doping with Fe in the B-site, the (La_0.8Sr_0.2)_0.95 Mn_0.5Fe_0.5O ₃ perovskite exhibits even better electrochemical catalytic activity which is due to the increase of the concentration of oxygen vacancy as compared with (La_0.8 Sr_0.2) _0.95 MnO₃ . Furthermore, (La_0.8Sr_0.2 )_0.95 Mn_0.5Fe_0.5O₃ 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 language	English
Pages (from-to)	5804-5810
Journal	Energy Procedia
Volume	158
DOIs	https://doi.org/10.1016/j.egypro.2019.01.548
Publication status	Published - Feb 2019
Event	10th International Conference on Applied Energy (ICAE 2018): “Innovative Solutions for Energy Transitions” - Hong Kong, China Duration: 22 Aug 2018 → 25 Aug 2018 https://www.journals.elsevier.com/applied-energy/news/call-for-papers-icae2018-the-10th-international-conference-o (For reference)

Research Keywords

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

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@article{bafff66ffc00476781f59818b77d4b73,

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

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.",

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

author = "Rong-hua Yuan and Yun He and Wei He and Meng Ni and Leung, {Michael K.H.}",

year = "2019",

month = feb,

doi = "10.1016/j.egypro.2019.01.548",

language = "English",

volume = "158",

pages = "5804--5810",

journal = "Energy Procedia",

issn = "1876-6102",

publisher = "Elsevier Ltd.",

note = "10th International Conference on Applied Energy (ICAE 2018) : “Innovative Solutions for Energy Transitions”, ICAE 2018 ; Conference date: 22-08-2018 Through 25-08-2018",

url = "https://www.journals.elsevier.com/applied-energy/news/call-for-papers-icae2018-the-10th-international-conference-o",

}

TY - JOUR

T1 - La0.8Sr0.2MnO3 based perovskite with A-site deficiencies as high performance bifunctional electrocatalyst for oxygen reduction and evolution reaction in alkaline

AU - Yuan, Rong-hua

AU - He, Yun

AU - He, Wei

AU - Ni, Meng

AU - Leung, Michael K.H.

PY - 2019/2

Y1 - 2019/2

N2 - 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.

AB - 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.

KW - A-site deficiency

KW - La0.8Sr0.2MnO3

KW - Oxygen evolution reaction

KW - Oxygen reduction reaction

KW - Perovskite

UR - http://www.scopus.com/inward/record.url?scp=85063866794&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85063866794&origin=recordpage

U2 - 10.1016/j.egypro.2019.01.548

DO - 10.1016/j.egypro.2019.01.548

M3 - RGC 21 - Publication in refereed journal

SN - 1876-6102

VL - 158

SP - 5804

EP - 5810

JO - Energy Procedia

JF - Energy Procedia

T2 - 10th International Conference on Applied Energy (ICAE 2018)

Y2 - 22 August 2018 through 25 August 2018

ER -