Preparation and testing of metal/Ce0.80Gd0.20O1.90 (metal: Ni, Pd, Pt, Rh, Ru) co-impregnated La0.20Sr0.25Ca0.45TiO3 anode microstructures for solid oxide fuel cells
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La0.20Sr0.25Ca0.45TiO3 (LSCTA-) is a novel mixed ionic and electronic conductor (MIEC) material which can act as a potential replacement Solid Oxide Fuel Cell (SOFC) anode ‘backbone’ microstructure, for the current state-of-the-art Ni-based cermet. By impregnating this ‘backbone’ with electrocatalytically active coatings of metal oxides and metallic particles, it is possible to create high performance SOFC anodes which offer improved redox stability and tolerance to non-optimal fuel gases. Here, we present short-term test data for SOFC containing LSCTA- anode ‘backbones’ impregnated with a variety of catalyst systems including: Ni/CGO, Pd/CGO, Pt/CGO, Rh/CGO and Ru/CGO. Electrolyte-supported SOFC containing Ni/CGO impregnated anodes showed large reductions in Area Specific Resistance (ASR), in comparison to previous generation research (0.55 Ω cm2 versus 1.2 Ω cm2, respectively). Exchange of the Ni component, for Pd and Rh, led to much lower ASR of 0.39 Ω cm2 and 0.41 Ω cm2 (in 97% H2:3% H2O, at 900°C and 0.8 V), respectively. Equivalent circuit fitting of AC impedance spectra revealed the absence of an anode charge transfer process for the Rh/CGO catalyst system above 875°C, in comparison to all other systems, identifying this system as a potential replacement for the Ni-based cermet.
Price , R , Cassidy , M , Grolig , J G , Mai , A & Irvine , J T S 2019 , ' Preparation and testing of metal/Ce 0.80 Gd 0.20 O 1.90 (metal: Ni, Pd, Pt, Rh, Ru) co-impregnated La 0.20 Sr 0.25 Ca 0.45 TiO 3 anode microstructures for solid oxide fuel cells ' Journal of The Electrochemical Society , vol. 166 , no. 4 , pp. F343-F349 . https://doi.org/10.1149/2.1181904jes
Journal of The Electrochemical Society
© 2019 The Electrochemical Society. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1149/2.1181904jes
DescriptionFunding: University of St Andrews and HEXIS AG, as well as the EPSRC Grants: EP/M014304/1 “Tailoring of Microstructural Evolution in Impregnated SOFC Electrodes” and EP/L017008/1 “Capital for Great Technologies”.
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