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Issue 18, 2015
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Solid oxide cells with zirconia/ceria Bi-Layer electrolytes fabricated by reduced temperature firing

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Abstract

Anode-supported solid oxide cells (SOCs) with thin bi-layer Y0.16Zr0.92O2−δ (YSZ)/Gd0.1Ce0.9O1.95 (GDC) electrolytes were prepared by a reduced-temperature (1250 °C) co-firing process enabled by the addition of a Fe2O3 sintering aid. The Fe2O3 amounts in the layers affected the formation of voids at the GDC/YSZ interface; the case with 1 mol% Fe2O3 in the YSZ layer and 2 mol% Fe2O3 in the GDC layer yielded minimal interfacial voids, presumably because of optimized shrinkage matching between the electrolyte layers during co-firing. The best cells yield fuel cell power density at 0.7 V in air and humidified hydrogen of 1.74 W cm−2 (800 °C) and 1.0 W cm−2 (700 °C). Under electrolysis conditions, i.e., air and 50 vol% H2O–50 vol% H2, the best cell area specific resistance is 0.12 Ω cm2 at 800 °C and 0.27 Ω cm2 at 700 °C. This excellent cell performance was explained by a number of factors related to the reduced firing temperature: (1) low electrolyte resistance due to minimization of YSZ/GDC interdiffusion; (2) minimal zirconate phase formation between the YSZ and the La0.6Sr0.4Fe0.8Co0.2O3 (LSFC) cathode because of the dense GDC barrier layer; (3) high three phase boundary density in the Ni–YSZ anode functional layer; and (4) good pore connectivity in the Ni–YSZ support. Preliminary life testing under fuel cell and electrolysis operation shows promising cell stability.

Graphical abstract: Solid oxide cells with zirconia/ceria Bi-Layer electrolytes fabricated by reduced temperature firing

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Publication details

The article was received on 17 Mar 2015, accepted on 31 Mar 2015, published on 31 Mar 2015 and first published online on 31 Mar 2015


Article type: Paper
DOI: 10.1039/C5TA01964H
Citation: J. Mater. Chem. A, 2015,3, 9955-9964
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    Solid oxide cells with zirconia/ceria Bi-Layer electrolytes fabricated by reduced temperature firing

    Z. Gao, V. Y. Zenou, D. Kennouche, L. Marks and S. A. Barnett, J. Mater. Chem. A, 2015, 3, 9955
    DOI: 10.1039/C5TA01964H

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