Chromium deposition and poisoning of La 2 NiO 4 cathode of solid oxide fuel cell

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.