Coke-resistant ferrite anode decorated with in-situ exsolved ceria for carbonaceous fuel oxidation
In this work, the perovskite-type La 0.8 Ce 0.2 FeO 3 (LCF) is employed as a host oxide for the exsolution of ceria in air and the further doping on La site using Pr 3+ (La 0.7 Pr 0.1 Ce 0.2 FeO 3 , LPCF) or Gd 3+ (La 0.7 Gd 0.1 Ce 0.2 FeO 3, LGCF) is used to achieve the exsolution of PrO x - and Gd 2 O 3 - doped ceria (PDC and GDC). The exsolution of (doped) ceria is accompanied by the segregation of Fe 2 O 3 that can promote fuel oxidation . The resulting perovskites are used as potential anode materials for solid oxide fuel cells. At 800 °C, the LPCF with 1 wt% Ni infiltration cell on a LSGM (La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3-δ ) electrolyte yields the lowest R p (polarization resistance) value (0.11 Ω cm 2 ) and the highest cell performance (808 mW cm −2 ) in H 2 fuel, but the cells with LCF and LGCF anode show a stable performance under hydrocarbon fuel conditions if Ni is infiltrated into the anode to assist the deprotonation . The parameters controlling the exsolution of the doped ceria and the catalysis for the hydrocarbon reforming are analyzed, proposing an intriguing path to achieving the exsolution of complex oxide on the surface of perovskite for the construct of a hierarchical electrode/catalyst for the applications in fuel conversion.
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