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B-site doped perovskite ferrate for efficient anode of a solid oxide fuel cell with in situ metal exsolution

Abstract

Compared to Ni(O) cermet, an oxide anode is much better for a solid oxide fuel cell at suppresses coking and carbon deposition with carbonaceous fuels. Furthermore, a small amount of metal nanoparticles can enhance the electrochemical performance of the oxide anode while maintaining compatibility with the carbonaceous fuel when anchored on the oxide surface. In this study, ferrate-based perovskites (La0.95Fe0.80Ni0.05Ti0.15O3, LFNT) with Ni0 particles exsolution are investigated via B-site doping to increase the stability at 800 oC in H2 atmosphere and electrocatalytic capability for fuel oxidation. Surprisingly, the B-site doped LaFeO3 (La0.95Fe0.8Mg0.2O3, LFM) showed a high oxide-ion conductivity of 10 mS cm-1 with limited electronic conduction and further doping of Ti4+ or Ni2+ could increase the electronic conductivity to 30 Scm-1 and 100 Scm-1 at 800 oC for the reduced La0.95Fe0.8Mg0.05TiO3 (LFMT) and LFNT, respectively. The cell with LFNT anode on a La0.9Sr0.1Ga0.8Mg0.2O2.85 electrolyte shows a polarisation resistance of 0.32 Ωcm2 at 800 oC and a high power density of 600 mWcm-2 can be obtained when ceria is added via infiltration as a co-catalyst.

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Publication details

The article was received on 07 Sep 2019, accepted on 27 Oct 2019 and first published on 29 Oct 2019


Article type: Paper
DOI: 10.1039/C9TA09916F
J. Mater. Chem. A, 2019, Accepted Manuscript

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    B-site doped perovskite ferrate for efficient anode of a solid oxide fuel cell with in situ metal exsolution

    C. Ni, Q. Zeng, D. He, L. Peng, D. Xie, J. Irvine, S. Duan and J. Ni, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA09916F

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