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Fabrication and characterization of BaCe0.8Y0.2O2.9-Ce0.85Sm0.15O1.925 composite electrolytes for IT-SOFCs

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Abstract

The BaCe0.8Y0.2O2.9-Ce0.85Sm0.15O1.925 composite electrolytes were prepared with BaCe0.8Y0.2O2.9 (BCY) and Ce0.85Sm0.15O1.925 (SDC). The SDC and BCY powders were mixed in the weight ratio of 95:5, 85:15, and 75:25, respectively (named as BS95, BS85, and BS75). Because of the composite effect between the SDC and BCY phases, the BS95 and BS85 exhibit improved conductivity compared with the pure SDC and BCY. The conductivity of BS95 is higher than that of BS85, indicating that the composite effect of BS95 is greater than that of BS85. Nevertheless, the composite effect in BS75 does not exist. Hence, we conclude that the composite effect in the BCY-SDC composites will decrease with the increase of the amount of BCY and even disappear when the amount of BCY exceeds a certain value. In our case, the optimum composition of the composite electrolyte is 95 wt% SDC and 5 wt% BCY. The BS95 has the highest conductivity (σ t = 0.07808 S cm−1, at 800 °C) and the fuel cell based on the BS95 shows the best performance (the maximum power density reaches as high as 526 mw cm−2 at 750 °C). The encouraging results suggest that the BCY-SDC composites are the very promising electrolyte materials for IT-SOFCs.

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Authors and Affiliations

  1. College of Physics Science and Technology, Shenyang Normal University, Shenyang, 110034, China

    Ji Yu, Ning Tian, Yufu Deng, Ling Liu, Liying Cheng, Peng Gao, Qingchao Pan, Yuancheng Wang & Xiuyan Chen

  2. Faculty of Materials and Energy, Southwest University, Chongqing, 400715, China

    Guannan Li

  3. College of Chemistry and Life Science, Shenyang Normal University, Shenyang, 110034, China

    Kezhen Qi

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  1. Ji Yu
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  2. Ning Tian
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  3. Yufu Deng
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  4. Guannan Li
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  5. Ling Liu
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  7. Peng Gao
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  9. Yuancheng Wang
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  10. Xiuyan Chen
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  11. Kezhen Qi
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Correspondence to Ning Tian.

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Yu, J., Tian, N., Deng, Y. et al. Fabrication and characterization of BaCe0.8Y0.2O2.9-Ce0.85Sm0.15O1.925 composite electrolytes for IT-SOFCs. Sci. China Chem. 58, 473–477 (2015). https://doi.org/10.1007/s11426-014-5176-x

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  • DOI: https://doi.org/10.1007/s11426-014-5176-x

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