首页|Correlation between hydration properties and electrochemical performances on Ln cation size effect in layered perovskite for protonic ceramic fuel cells

Correlation between hydration properties and electrochemical performances on Ln cation size effect in layered perovskite for protonic ceramic fuel cells

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PrBa0.5Sr0.5Co1.5Fe0.5O5+δ(PrBSCF)has attracted much research interest as a potential triple ionic and electronic conductor(TIEC)electrode for protonic ceramic fuel cells(PCFCs).The chemical formula for PrBSCF is AA'B2O5+δ,with Pr(A-site)and Ba/Sr(A'-site)alternately stacked along the c-axis.Due to these structural features,the bulk oxygen ion diffusivity is significantly enhanced through the disorder-free channels in the PrO layer;thus,the A site cations(lanthanide ions)play a pivotal role in determining the overall electrochemical properties of layered perovskites.Consequently,previous research has pre-dominantly focused on the electrical properties and oxygen bulk/surface kinetics of Ln cation effects,whereas the hydration properties for PCFC systems remain unidentified.Here,we thoroughly examined the proton uptake behavior and thermodynamic parameters for the hydration reaction to conclusively determine the changes in the electrochemical performances depending on LnBa0.5Sr0.5Co1.5Fe0.5O5+δ(LnBSCF,Ln=Pr,Nd,and Gd)cathodes.At 500 ℃,the quantitative proton concentration of PrBSCF was 2.04 mol％and progressively decreased as the Ln cation size decreased.Similarly,the Gibbs free energy indicated that less energy was required for the formation of protonic defects in the order of PrBSCF＜NdBSCF＜GdBSCF.To elucidate the close relationship between hydration properties and electro-chemical performances in LnBSCF cathodes,PCFC single cell measurements and analysis of the distribu-tion of relaxation time were further investigated.

Protonic ceramic fuel cellCathodeTriple ionic and electronic conductorHydration propertyProton uptakeGibbs free energy

Inhyeok Cho、Jiwon Yun、Boseok Seong、Junseok Kim、Sun Hee Choi、Ho-Il Ji、Sihyuk Choi

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Department of Mechanical Engineering,Kumoh National Institute of Technology,Gumi 39177,Gyeongbuk,Republic of Korea

Department of Aeronautics,Mechanical and Electronic Convergence Engineering,Kumoh National Institute of Technology,Gumi 39177,Gyeongbuk,Republic of Korea

Center for Energy Materials Research,Korea Institute of Science and Technology(KIST),Seoul 02792,Republic of Korea

Center for Hydrogen and Fuel Cell Research,Clean Technology Research Division,Korea Institute of Science and Technology(KIST),Seoul 02792,Republic of Korea

Department of Energy and Environmental Engineering,University of Science and Technology,Seoul 02792,Republic of Korea

Nanomaterials Science and Engineering,Korea University of Science and Technology(UST),KIST Campus,Seoul 02792,Republic of Korea

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National Research Foundation(NRF)grant funded by the Korea governmentNational Research Foundation(NRF)grant funded by the Korea governmentNational Research Foundation(NRF)grant funded by the Korea governmentKIST Institutional Program

NRF-2022R1C1C1007619NRF-2021M3H4A1A01002921NRF-2021M313A10842922E32592-23-069

2024

10.1016/j.jechem.2023.09.004

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.88(1)
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