Performance evaluation of an anode-supported solid oxide fuel cell with Ce_(0.8)Sm_(0.2)O_(1.9) impregnated GdBaCo_2O_(5+δ) cathode

摘要

The performance of an anode-supported solid oxide fuel cell with nanosized Ce_(0.8)Sm_(0.2)O_(1.9) (SDC) impregnated GdBaCo_2O_(5+δ) (GBCO) cathode is evaluated under various operation conditions. An SDC interlayer is applied between 8 mol% yttria-stabilized zirconia (8YSZ) electrolyte and cathode to prevent undesired chemical reaction. At 700 ℃, the fuel cell yields a maximum power density of 790 mW cm~(-2) when using simulated air as oxidant, which is promoted to 1100 mW cm~(-2) in oxygen flow. The activation energies of ohmic resistance are smaller than that of bulk YSZ due to non-YSZ contribution. Electrode polarization resistance changes with fuel cell voltage while ohmic resistance nearly remains constant. The fuel cell output is mainly determined by the electrode polarization.