Electrochemical stability of La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ~-) infiltrated YSZ oxygen electrode for reversible solid oxide fuel cells

摘要

La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3_δ) (LSCF)-YSZ (yttria stabilized zirconia) oxygen electrodes were developed by an infiltration process for reversible solid oxide fuel cells (RSOFCs). Electrochemical performance of the LSCF-YSZ composite oxygen electrode was investigated in both fuel cell and steam electrolysis modes. Galvanostatic polarization operated at ±600 mA cm~(-2) and 750 ℃ showed that the cell has a voltage degradation rate of 3.4% and 4.9% for fuel cell mode and steam electrolysis mode, respectively. Post-test SEM (scanning electronic microscopy) analysis of the electrodes indicates that the agglomeration of infiltrated LSCF particles is possibly responsible for the performance degradation of the cell.