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Research Article | Open Access

Attempted preparation of La0.5Ba0.5MnO3−δ leading to an in-situ formation of manganate nanocomposites as a cathode for proton-conducting solid oxide fuel cells

Rui Zhoua,†, Yanru Yina,†, Hailu Daib, Xuan Yanga, Yueyuan Gua(), Lei Bia()
School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China
School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China

† Rui Zhou and Yanru Yin contributed equally to this work.

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Abstract

A La0.5Ba0.5MnO3−δ oxide was prepared using the sol–gel technique. Instead of a pure phase, La0.5Ba0.5MnO3−δ was discovered to be a combination of La0.7Ba0.3MnO3−δ and BaMnO3. The in-situ production of La0.7Ba0.3MnO3−δ+BaMnO3 nanocomposites enhanced the oxygen vacancy (VO) formation compared to single-phase La0.7Ba0.3MnO3−δ or BaMnO3, providing potential benefits as a cathode for fuel cells. Subsequently, La0.7Ba0.3MnO3−δ+BaMnO3 nanocomposites were utilized as the cathode for proton-conducting solid oxide fuel cells (H-SOFCs), which significantly improved cell performance. At 700 ℃, H-SOFC with a La0.7Ba0.3MnO3−δ+BaMnO3 nanocomposite cathode achieved the highest power density (1504 mW·cm−2) yet recorded for H-SOFCs with manganate cathodes. This performance was much greater than that of single-phase La0.7Ba0.3MnO3−δ or BaMnO3 cathode cells. In addition, the cell demonstrated excellent working stability. First-principles calculations indicated that the La0.7Ba0.3MnO3−δ/BaMnO3 interface was crucial for the enhanced cathode performance. The oxygen reduction reaction (ORR) free energy barrier was significantly lower at the La0.7Ba0.3MnO3−δ/BaMnO3 interface than that at the La0.7Ba0.3MnO3−δ or BaMnO3 surfaces, which explained the origin of high performance and gave a guide for the construction of novel cathodes for H-SOFCs.

Keywords

La0.5Ba0.5MnO3−δnanocompositescathodeproton conductorsolid oxide fuel cells (SOFCs)

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Journal of Advanced Ceramics
Volume 12 Issue 6,
June 2023
Pages 1189-1200
DOI: 10.26599/JAC.2023.9220748
Cite this article:
Zhou R, Yin Y, Dai H, et al. Attempted preparation of La0.5Ba0.5MnO3−δ leading to an in-situ formation of manganate nanocomposites as a cathode for proton-conducting solid oxide fuel cells. Journal of Advanced Ceramics, 2023, 12(6): 1189-1200. https://doi.org/10.26599/JAC.2023.9220748
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