Chromium deposition and poisoning of La2NiO4 cathode of solid oxide fuel cell

摘要

Chromium deposition and poisoning of La2NiO4 cathode of solid oxide fuel cell were studied. La2NiO4 cathode showed stable performance in the presence of metallic interconnects. Comparing with the polarization resistance (Rp) of La2NiO4 cathode in the absence of metallic interconnects, Rp did not change in the presence of metallic interconnect. After electrical conductivity relaxation method, La2NiO4 with high surface oxygen diffusion coefficients working under Cr atmosphere improved the oxygen reduction kinetics and increased cathode O2 reduction reaction rates. No chromium deposition was observed on the La2NiO4 cathode surface after polarization for 20 h at 800°C. The chemical compatibility of La2NiO4/Cr2O₃ and La₂NiO₄/Gd_0.1Ce_0.9O_1.95 (GDC) study indicates that La₂NiO₄ did not react with Cr₂O₃ and GDC under the operating temperature. The results indicate that La₂NiO₄ cathode is a potential chromium-tolerant material of solid oxide fuel cell.