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Research Article | Open Access

La0.5−xScxSr0.5MnO3−δ cathodes for proton-conducting solid oxide fuel cells: Taking advantage of the secondary phase

Hailu Dai1Samir Boulfrad2Xinrui Chu1Yueyuan Gu3Lei Bi3( )Qinfang Zhang1( )
School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China
College of Science & Engineering, Hamad Bin Khalifa University, Doha 34110, Qatar
School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China
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Abstract

Designing high-performance cathodes is crucial for proton-conducting solid oxide fuel cells (H-SOFCs), as the cathode heavily influences cell performance. Although manganate cathodes exhibit superior stability and thermal compatibility, their poor cathode performance at intermediate temperatures renders them unsuitable for H-SOFC applications. To address this issue, Sc is utilized as a dopant to modify the traditional La0.5Sr0.5MnO3 cathode at the La site. Although the solubility of Sc at the La site is restricted to 2.5%, this modest quantity of Sc doping can improve the material's oxygen and proton transport capabilities, hence improving cathode and fuel cell performance. Furthermore, when the doping concentration exceeds 2.5%, the secondary phase ScMnO3 forms in situ, resulting in La0.475Sc0.025Sr0.5MnO3 (LScSM)+ScMnO3 nanocomposites. Although the secondary phase is often considered undesirable, the high protonation capacity of ScMnO3 can compensate for the low proton diffusion ability of LScSM. These two phases complement each other to provide high-performance cathodes. The nominal La0.4Sc0.1Sr0.5MnO3 is the optimal composition, which takes advantage of the excellent electronic conductivity and fast oxygen diffusion rates of LScSM, as well as the good proton diffusion capacity of ScMnO3, to produce a high fuel cell output of 1529 mW·cm−2 at 700 °C. Furthermore, the fuel cell exhibited good operational stability under working conditions, indicating that La0.4Sc0.1Sr0.5MnO3 is a viable cathode choice for H-SOFCs.

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Journal of Advanced Ceramics
Pages 1759-1770
Cite this article:
Dai H, Boulfrad S, Chu X, et al. La0.5−xScxSr0.5MnO3−δ cathodes for proton-conducting solid oxide fuel cells: Taking advantage of the secondary phase. Journal of Advanced Ceramics, 2024, 13(11): 1759-1770. https://doi.org/10.26599/JAC.2024.9220972

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Received: 01 August 2024
Revised: 05 September 2024
Accepted: 15 September 2024
Published: 11 November 2024
© The Author(s) 2024.

This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).

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