Document Type

Article

Publication Date

11-1-2017

Abstract

The conventional Ni-YSZ anode as a cermet for solid oxide fuel cells (SOFCs) suffers from several shortcomings typically including low resistance to carbon coking, re-oxidation as well as sulfur poisoning. Perovskite anode as a potential substitute for Ni-YSZ anode has drawn much attention due to its impressive merits regarding carbon coking and re-oxidation resistance ability. In this study, a novel Nb-doped Fe-based perovskite anode candidate La0.9Ca0.1Fe0.9Nb0.1O3-δ was developed in which the addition of Nb greatly enhanced the structure stability in reducing atmosphere while the thermal expansion behavior was subtly influenced. The thermal expansion coefficient of the novel Nb-doped Fe-based perovskite anode changed from 11.67×10-6 K-1 to 11.57×10-6 K-1 after Nb doping while the electrical conductivity was greatly improved as well. At 800℃, the electrical conductivity of the novel Nb-doped Fe-based perovskite anode in H2 reached up to 1.95 S/cm. The cell with La0.9Ca0.1Fe0.9Nb0.1O3-δ anode prepared by infiltration method presented high electrochemical performance. The maximal power densities in H2 and CO at 800℃ were up to 539 and 491 mW/cm2, respectively. It is remarkable that the cell has impressive long-term stability in pure CO at 800℃ for as long as 200 h. The results indicate that the perovskite La0.9Ca0.1Fe0.9Nb0.1O3-δ material is electrochemically active for both H2 and CO oxidation which can be taken as a promising anode candidate for SOFCs practical applications.

Publication Source (Journal or Book title)

Wuji Cailiao Xuebao/Journal of Inorganic Materials

First Page

1188

Last Page

1194

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