High entropy double perovskite cathodes with enhanced activity and operational stability for solid oxide fuel cells

Mengke Yuan; Yuan Gao; Limin Liu; Juntao Gao; Zhe Wang; Ying Li; Hongru Hao; Wentao Hao; Xiutao Lou; Zhe Lv; Lingling Xu; Bo Wei

doi:10.1016/j.jeurceramsoc.2023.12.049

High entropy double perovskite cathodes with enhanced activity and operational stability for solid oxide fuel cells

Mengke Yuan
, Yuan Gao
, Limin Liu^*
, Juntao Gao
, Zhe Wang
, Ying Li
, Hongru Hao
, Wentao Hao
, Xiutao Lou
, Zhe Lv
, Lingling Xu
, Bo Wei

^*Corresponding author for this work

School of Physics, Harbin Institute of Technology
Southwest Petroleum University China
Harbin Normal University

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

Abstract

Rare-earth site high entropy double perovskite oxides with different molar ratios have been evaluated as the cathodes for intermediate-temperature solid oxide fuel cells (IT-SOFC). The effect of configuration entropy on crystal structure, electrical conductivity, electrochemical performance and stability are investigated. Our results reveal that the activity of all high entropy oxides show enhanced electrochemical activity. Among them, the equimolar one (HEO) exhibits the highest activity with a low polarization resistance of 0.05 Ω cm² at 700 °C. Moreover, it exhibits excellent stability in the CO₂-containing atmosphere. The enhanced activity and operational stability can be attributed to reduced surface Ba segregation and the formation of active and robust BaCoO_3-δ nanoparticles on HEO surface, rather than BaCO₃ and Co₃O₄ phases. This work indicates that configurational entropy engineering is very effective for rational surface composition regulation.

Original language	English
Pages (from-to)	3267-3276
Number of pages	10
Journal	Journal of the European Ceramic Society
Volume	44
Issue number	5
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2023.12.049
State	Published - May 2024
Externally published	Yes

Keywords

Cathode
Cation segregation
Double perovskite
High configuration entropy
Solid oxide fuel cell

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10.1016/j.jeurceramsoc.2023.12.049

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title = "High entropy double perovskite cathodes with enhanced activity and operational stability for solid oxide fuel cells",

abstract = "Rare-earth site high entropy double perovskite oxides with different molar ratios have been evaluated as the cathodes for intermediate-temperature solid oxide fuel cells (IT-SOFC). The effect of configuration entropy on crystal structure, electrical conductivity, electrochemical performance and stability are investigated. Our results reveal that the activity of all high entropy oxides show enhanced electrochemical activity. Among them, the equimolar one (HEO) exhibits the highest activity with a low polarization resistance of 0.05 Ω cm2 at 700 °C. Moreover, it exhibits excellent stability in the CO2-containing atmosphere. The enhanced activity and operational stability can be attributed to reduced surface Ba segregation and the formation of active and robust BaCoO3-δ nanoparticles on HEO surface, rather than BaCO3 and Co3O4 phases. This work indicates that configurational entropy engineering is very effective for rational surface composition regulation.",

keywords = "Cathode, Cation segregation, Double perovskite, High configuration entropy, Solid oxide fuel cell",

author = "Mengke Yuan and Yuan Gao and Limin Liu and Juntao Gao and Zhe Wang and Ying Li and Hongru Hao and Wentao Hao and Xiutao Lou and Zhe Lv and Lingling Xu and Bo Wei",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier Ltd",

year = "2024",

month = may,

doi = "10.1016/j.jeurceramsoc.2023.12.049",

language = "英语",

volume = "44",

pages = "3267--3276",

journal = "Journal of the European Ceramic Society",

issn = "0955-2219",

publisher = "Elsevier B.V.",

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}

TY - JOUR

T1 - High entropy double perovskite cathodes with enhanced activity and operational stability for solid oxide fuel cells

AU - Yuan, Mengke

AU - Gao, Yuan

AU - Liu, Limin

AU - Gao, Juntao

AU - Wang, Zhe

AU - Li, Ying

AU - Hao, Hongru

AU - Hao, Wentao

AU - Lou, Xiutao

AU - Lv, Zhe

AU - Xu, Lingling

AU - Wei, Bo

PY - 2024/5

Y1 - 2024/5

N2 - Rare-earth site high entropy double perovskite oxides with different molar ratios have been evaluated as the cathodes for intermediate-temperature solid oxide fuel cells (IT-SOFC). The effect of configuration entropy on crystal structure, electrical conductivity, electrochemical performance and stability are investigated. Our results reveal that the activity of all high entropy oxides show enhanced electrochemical activity. Among them, the equimolar one (HEO) exhibits the highest activity with a low polarization resistance of 0.05 Ω cm2 at 700 °C. Moreover, it exhibits excellent stability in the CO2-containing atmosphere. The enhanced activity and operational stability can be attributed to reduced surface Ba segregation and the formation of active and robust BaCoO3-δ nanoparticles on HEO surface, rather than BaCO3 and Co3O4 phases. This work indicates that configurational entropy engineering is very effective for rational surface composition regulation.

AB - Rare-earth site high entropy double perovskite oxides with different molar ratios have been evaluated as the cathodes for intermediate-temperature solid oxide fuel cells (IT-SOFC). The effect of configuration entropy on crystal structure, electrical conductivity, electrochemical performance and stability are investigated. Our results reveal that the activity of all high entropy oxides show enhanced electrochemical activity. Among them, the equimolar one (HEO) exhibits the highest activity with a low polarization resistance of 0.05 Ω cm2 at 700 °C. Moreover, it exhibits excellent stability in the CO2-containing atmosphere. The enhanced activity and operational stability can be attributed to reduced surface Ba segregation and the formation of active and robust BaCoO3-δ nanoparticles on HEO surface, rather than BaCO3 and Co3O4 phases. This work indicates that configurational entropy engineering is very effective for rational surface composition regulation.

KW - Cathode

KW - Cation segregation

KW - Double perovskite

KW - High configuration entropy

KW - Solid oxide fuel cell

UR - https://www.scopus.com/pages/publications/85180598596

U2 - 10.1016/j.jeurceramsoc.2023.12.049

DO - 10.1016/j.jeurceramsoc.2023.12.049

M3 - 文章

AN - SCOPUS:85180598596

SN - 0955-2219

VL - 44

SP - 3267

EP - 3276

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 5

ER -

High entropy double perovskite cathodes with enhanced activity and operational stability for solid oxide fuel cells

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Keywords

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