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Acceptor-doped ceria deposited on a porous Ni film as a possible micro-SOFC electrolyte

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Abstract

Micro-SOFCs, miniaturized solid oxide fuel cells (SOFCs) for low temperature operation, are being developed as a power source for portable electronics. Reducing the thickness of the electrolyte and the adoption of acceptor-doped ceria as an electrolyte material are important to minimize the Ohmic resistance at low temperature. Acceptor-doped ceria thin-films are often deposited on nano-porous metal substrates to reduce cracking of the thin electrolyte. However, due to the difficulty of depositing a pore-free electrolyte on a porous medium, the cells often show the low open circuit voltages (OCVs). In this study, we have deposited ∼1 μm-thick Gd-doped ceria on a nano-porous nickel film to assess whether a thin-film, metal-supported GDC can be deposited as a pore-free layer and would thus be suitable as an electrolyte of micro-SOFCs. The Ni-supported GDC cell showed an OCV of ∼0.92 V at 450 °C under a hydrogen/air gradient. The high OCV verifies that the thin-electrolyte layer, deposited on porous Ni using the pulsed laser deposition (PLD) method, is dense enough to prevent gas leakage as also observed in its microstructure.

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Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2011-0023389).

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Authors and Affiliations

  1. Fuel Cell Research Center and Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea

    Younki Lee & Gyeong Man Choi

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  1. Younki Lee
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  2. Gyeong Man Choi
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Correspondence to Gyeong Man Choi.

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Lee, Y., Choi, G.M. Acceptor-doped ceria deposited on a porous Ni film as a possible micro-SOFC electrolyte. J Electroceram 31, 238–244 (2013). https://doi.org/10.1007/s10832-013-9824-x

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  • DOI: https://doi.org/10.1007/s10832-013-9824-x

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