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Cathode materials Sr1−x Ho x CoO3−δ (SHC, x ≤ 0.3) for IT-SOFC

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Abstract

Cathode materials consisting of Sr1−x Ho x CoO3−δ (SHC, x ≤ 0.3) were synthesized by solid-state reaction for intermediate temperature solid oxide fuel cell (IT-SOFC). The crystal structures, total electrical conductivity, thermogravimetric analysis (TGA), thermal expansion coefficient (TEC), area-specific resistance (ASR), and cell performance were investigated. X-ray powder diffraction (XRD) shows the presence of two structural phases in the series belonging to Pm-3m for Sr0.9Ho0.1CoO3−δ and I4/mmm for Sr0.8Ho0.2CoO3−δ and Sr0.7Ho0.3CoO3−δ . Electrical conductivity measurements show that the conductivity is all higher than 182 S cm−1 from 170 to 800 °C. TGA and thermal expansion measurement shows that oxygen vacancies and TEC decrease with increasing x at high temperature. The TECs are influenced by the concentration of oxygen vacancies and the transition of the Co(III) ions from a low-spin to a high-spin state. AC impedance measurements in symmetrical cells with La0.8Sr0.2Ga0.83Mg0.17O2.815 (LSGM) as an electrolyte show that the ASR and activation energy increase with increasing x. Sr0.9Ho0.1CoO3−δ exhibits the best cathode characteristics with a maximum power density of 839 mW/cm2.

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Acknowledgments

Many thanks to Prof. John B Goodenough for his support and guidance. This work is financially supported by the National Natural Science Foundation of China (51374055 and 50904016) and the Fundamental Research Funds for the Central Universities of China (N130502003).

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Authors and Affiliations

  1. School of Materials & Metallurgy, Northeastern University, Shenyang, Liaoning, 110819, China

    Tao Liu & **g-Kun Yu

  2. College of Science, Shenyang Aerospace University, Shenyang, Liaoning, 110136, China

    Lin Li

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  1. Tao Liu
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Correspondence to Tao Liu.

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Liu, T., Li, L. & Yu, JK. Cathode materials Sr1−x Ho x CoO3−δ (SHC, x ≤ 0.3) for IT-SOFC. Ionics 22, 853–858 (2016). https://doi.org/10.1007/s11581-015-1614-9

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