Characterisation of Bi doped YBaCo2O5+δ layered perovskite oxide as a cathode for Intermediate-temperature solid oxide fuel cell
by He Wang; Jingsheng Xu; Zhaoyuan Song; Xiaogang Su; Dapeng Wu; Leilei Zhang
International Journal of Computational Materials Science and Surface Engineering (IJCMSSE), Vol. 10, No. 2, 2021

Abstract: A layered perovskite oxide Y0.9Bi0.1BaCo2O5+δ (YBBCO) was evaluated as an intermediate-temperature solid oxide fuel cell (IT-SOFC) cathode material. The YBBCO shows a P4/mmm tetragonal structure with 3 × 3 × 1 superstructure. Its electrical conductivity attained 91-76 S cm-1 at 600-800°C, which is high enough to provide sufficient electronic transfer for cathode oxygen reduction. At 100-900°C, the thermal expansion coefficient (TEC) of the YBBCO was 16.8 × 10-6 K-1, consistent well with common IT electrolytes like Sm0.2Ce0.8O1.9 (SDC). The polarisation resistance (Rp) of the YBBCO cathode was 0.088 Ω cm2 at 700°C, and the peak power density of the YBBCO cathode cell attained 252 mW cm-2 at the same temperature. Excellent electrochemical performance, sufficient conductivity, and appropriate TEC indicate the great potential of the YBBCO for application in IT-SOFC cathode.

Online publication date: Wed, 27-Oct-2021

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