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High-performance Fe–Co-based SOFC cathodes

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Abstract

With the aim of reducing the temperature of the solid oxide fuel cell (SOFC), a new high-performance perovskite cathode has been developed. An area-specific resistance (ASR) as low as 0.12 Ωcm2 at 600 °C was measured by electrochemical impedance spectroscopy (EIS) on symmetrical cells. The cathode is a composite between (Gd0.6Sr0.4)0.99Fe0.8Co0.2O3-δ (GSFC) and Ce0.9Gd0.1O1.95 (CGO10). Examination of the microstructure of the cathodes by scanning electron microscopy (SEM) revealed a possibility of further optimisation of the microstructure in order to increase the performance of the cathodes. It also seems that an adjustment of the sintering temperature will make a lowering of the ASR value possible. The cathodes were compatible with ceria-based electrolytes but reacted to some extent with zirconia-based electrolytes depending on the sintering temperature.

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Notes

  1. The exact procedure should be followed in order to obtain the low ASR values reported in this study.

  2. In general, the ASR values are in the range 0.12 to 0.18 Ωcm2 at 600 °C.

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Acknowledgements

Colleagues at the Fuel Cells and Solid State Chemistry Division are thanked for fruitful discussions and encouragement. The Danish Energy Agency is thanked for financial support (j. nr. 33030-0109).

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Authors and Affiliations

  1. Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, 4000, Roskilde, Denmark

    Kent Kammer Hansen, Karin Vels Hansen & Mogens Mogensen

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  1. Kent Kammer Hansen
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  2. Karin Vels Hansen
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  3. Mogens Mogensen
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Correspondence to Kent Kammer Hansen.

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Hansen, K.K., Hansen, K.V. & Mogensen, M. High-performance Fe–Co-based SOFC cathodes. J Solid State Electrochem 14, 2107–2112 (2010). https://doi.org/10.1007/s10008-010-1052-6

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  • DOI: https://doi.org/10.1007/s10008-010-1052-6

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