Development of high performance cathodes with low polarization resistance is critical to the success of solid oxide fuel cell (SOFC) development and commercialization. In this paper, (La0.8Sr0.2) 0.9MnO3 (LSM)-Gd0.2Ce0.8O 1.9(GDC) composite powder (LSM ~70wt%, GDC ~30 wt%) was prepared through modification of LSM powder by Gd0.2Ce0.8(NO 3) x solution impregnation, followed by calcination. The electrode polarization resistance of the LSM-GDC cathode prepared from the composite powder was ~0.60 Ω cm2 at 750 °C, which is ~13 times lower than that of pure LSM cathode (~8.19 Ω cm2 at 750 °C) on YSZ electrolyte substrates. The electrode polarization resistance of the LSM-GDC composite cathode at 700 °C under 500 mA/cm2 was ~0.42 Ω cm2, which is close to that of pure LSM cathode at 850 °C. Gd0.2Ce0.8(NO3) x solution impregnation modification not only inhibits the growth of LSM grains during sintering but also increases the triple-phase-boundary (TPB) area through introducing ionic conducting phase (Gd,Ce)O2-δ, leading to the significant reduction of electrode polarization resistance of LSM cathode.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Electrical and Electronic Engineering