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Research Article | Open Access

Doping strategy on improving the overall cathodic performance of double perovskite LnBaCo2O5+δ (Ln=Pr, Gd) as potential SOFC cathode materials

Fangze Chena,b,1, Dacheng Zhoua,b,1, Xueqing Xiongb, Juntao Panb, Donglin Caib, Ze Weib, Xiyong Chena,b,( ), Yihui Liuc,( ), Nengneng Luoa,b, Jialin Yana,b, Toyohisa Fujitaa,b
State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi University, Nanning, 530004, Guangxi, China
School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, Guangxi, China
Hubei Key Laboratory of Advanced Technology for Automotive Components & Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, 430070, Hubei, China

1 Mr. Fangze Chen and Dacheng Zhou contributed to this study equally.

Peer review under responsibility of The Chinese Ceramic Society.

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Graphical Abstract

Abstract

A series of single-phase double perovskite Pr1-xGdxBaCo2-yFeyO5+δ (x = 0, 0.5 and 1, 0 ≤ y ≤ 1) materials were engineered through A/B site co-doping strategy to improve the mechanical, electrical and electrochemical properties as potential cathode materials for the application of intermediate solid oxide fuel cells (IT-SOFCs). The corresponding thermochemical stability, thermal expansion behavior, electrical conductivity and cathodic polarization resistance of the materials were systematically investigated. It was found that the A-site dual lanthanide doped Pr0.5Gd0.5BaCo2O5+δ (PGBCO) exhibits improved electrical conductivity, reduced thermal expansion, and comparatively low electrochemical polarization resistance versus single lanthanide double perovskite, PrBaCo2O5+δ (PBCO) and GdBaCo2O5+δ (GBCO) materials. Further investigation on the effect of B-site Fe-doping on Pr0.5Gd0.5BaCo2-yFeyO5+δ (PGBCF-y, 0 ≤ y ≤ 1) reveals that all the PGBCF-y compositions exhibit excellent chemical stability with Gd-doped ceria (GDC) at operating temperatures not higher than 1 100 ℃. Besides, doping of Fe in B-site can effectively reduce the thermal expansion coefficients (TECs) of the Pr0.5Gd0.5BaCo2O5+δ ceramics at 30–1 000 ℃. And the electrochemical impedance spectra (EIS) results show that the PGBCF-y|GDC| PGBCF-y symmetric cells have acceptable low area specific polarization resistances. Further examination of the cathodic polarization and characteristic capacitance from the AC impedance spectra by employing the relaxation time distribution (DRT) method demonstrated that charge transfer is the dominating sub-process for the oxygen transport through the materials.

Keywords

Electrical conductivityThermal expansionDouble perovskiteElectrochemical polarizationThermochemical stability

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Journal of Materiomics
Volume 9 Issue 5,
September 2023
Pages 825-837
DOI: 10.1016/j.jmat.2023.02.004
Cite this article:
Chen F, Zhou D, Xiong X, et al. Doping strategy on improving the overall cathodic performance of double perovskite LnBaCo2O5+δ (Ln=Pr, Gd) as potential SOFC cathode materials. Journal of Materiomics, 2023, 9(5): 825-837. https://doi.org/10.1016/j.jmat.2023.02.004

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Received: 13 December 2022
Revised: 08 February 2023
Accepted: 13 February 2023
Published: 03 March 2023
© 2023 The Authors.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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