Abstract
Chromium deposition and poisoning of La(2)NiO(4) cathode of solid oxide fuel cell were studied. La(2)NiO(4) cathode showed stable performance in the presence of metallic interconnects. Comparing with the polarization resistance (R (p)) of La(2)NiO(4) cathode in the absence of metallic interconnects, R (p) did not change in the presence of metallic interconnect. After electrical conductivity relaxation method, La(2)NiO(4) with high surface oxygen diffusion coefficients working under Cr atmosphere improved the oxygen reduction kinetics and increased cathode O(2) reduction reaction rates. No chromium deposition was observed on the La(2)NiO(4) cathode surface after polarization for 20 h at 800°C. The chemical compatibility of La(2)NiO(4)/Cr(2)O(3) and La(2)NiO(4)/Gd(0.1)Ce(0.9)O(1.95) (GDC) study indicates that La(2)NiO(4) did not react with Cr(2)O(3) and GDC under the operating temperature. The results indicate that La(2)NiO(4) cathode is a potential chromium-tolerant material of solid oxide fuel cell.