Demonstration of high performance in a perovskite oxide supported solid oxide fuel cell based on La and Ca co-doped SrTiO3
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Perovskite electrodes have been considered as an alternative to Ni-YSZ cermet-based anodes as they afford better tolerance towards coking and impurities and due to redox stability can allow very high levels of fuel utilisation. Unfortunately performance levels have rarely been sufficient, especially for a second generation anode supported concept. A-site deficient lanthanum and calcium co-doped SrTiO3, La0.2Sr0.25Ca0.45TiO3 (LSCTA-) shows promising thermal, mechanical and electrical properties and has been investigated in this study as a potential anode support material for SOFCs. Flat multilayer ceramics cells were fabricated by aqueous tape casting and co-sintering, comprising a 450 μm thick porous LSCTA- scaffold support, a dense YSZ electrolyte and a thin layer of La0.8Sr0.2CoO3-δ (LSC)-La0.8Sr0.2FeO3-δ (LSF)-YSZ cathode. Impregnation of a small content of Ni significantly enhanced fuel cell performance over naked LSCTA-. Use of ceria as a co-catalyst was found to improve the microstructure and stability of impregnated Ni and this in combination with the catalytic enhancement from ceria significantly improved performance over Ni impregnation alone. With addition of CeO2 and Ni to a titanate scaffold anode that had been pre-reduced at 1000 oC, a maximum powder density of 0.96 W cm-2 can be achieved at 800 oC using humidified hydrogen as fuel. The encouraging results show that an oxide anode material, LSCTA- can be used as anode support with YSZ electrolyte heralding a new option for SOFC development.
Lu , L , Ni , C , Cassidy , M & Irvine , J T S 2016 , ' Demonstration of high performance in a perovskite oxide supported solid oxide fuel cell based on La and Ca co-doped SrTiO 3 ' Journal of Materials Chemistry , vol 4 , no. 30 , pp. 11708-11718 . DOI: 10.1039/C6TA04074H
Journal of Materials Chemistry
Copyright 2016 the Authors. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org/10.1039/C6TA04074H
The research leading to these results has received funding from the European Union's Seventh Framework Programme (FP7/2007-2013) for the Fuel Cells and Hydrogen Joint Technology Initiative under grant agreement n° 256730 and Energy Technology Partnership (ETP).
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