An FeNbO4-based oxide anode for a solid oxide fuel cell (SOFC)
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The advantage of n-type semiconductor for an anode of solid oxide fuel cells (SOFCs) lies in its higher electronic conductivity in reducing atmosphere than in air. In this study, n-type FeNbO4-based oxides that can be reduced at temperatures below 700 °C for a conductivity above 1 S cm−1 are explored as anode materials for a ceria-based SOFC utilizing liquefied-petroleum-gas (LPG) fuel apart from pure H2. Fe0.8Nb1.2O4 with 20 at.% Fe deficiency was founded in the sample sintered at 1250 °C. The structure stability of FeNbO4 under reducing atmosphere can be improved by its solid solution with a less-reducible TiO2 that also stabilizes the high-temperature α-PbO2 type structure with mixed Fe3+ and Nb5+ cation. In particular, a full cell employing Ti0.36(Fe0.985Nb1.015)0.84O4, a stable and electrically conductive (1 S cm−1) oxide in 5% H2, as anode shows a powder density of 180 mW cm−2 at 700 °C if 0.5 wt% Pd is impregnated to increase the electrocatalysis and the electric loss is mostly from the electrolyte. The oxide anode showed a degradation (20% during the 5–26 h aging) and the carbon deposition is slight after 5-h operation under an LPG fuel.
Liu , X , Xie , D , Irvine , J T S , Ni , J & Ni , C 2020 , ' An FeNbO 4 -based oxide anode for a solid oxide fuel cell (SOFC) ' , Electrochimica Acta , vol. In press , 135692 . https://doi.org/10.1016/j.electacta.2020.135692
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DescriptionWe would like to acknowledge the support from the Natural Science Foundation of China (NSFC, 51702264, 41371275), National Key Research and Development Program of China (grant No. 2018FYD0200701). C.N. also thank the Award of Bayu Young Scholarship from the Chongqing Teaching Committee.
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