Low-temperature Protonic Ceramic Membrane Fuel Cells (pcmfcs) With Srco_(0.9)sb_(0.1)o_(3-δ) Cubic Perovskite Cathode

摘要

The SrCo_(0.9)Sb_(0.1)O_(3-δ) (SCS) composite oxide with cubic perovskite structure was synthesized by a modified Pechini method and examined as a novel cathode for protonic ceramic membrane fuel cells (PCMFCs). At 700 C and under open-circuit condition, symmetrical SCS cathode on BaZr_(0.1)Ce_(0.7)Y_(0.2)_(3-δ) (BZCY7) electrolyte showed low polarization resistances (R_P) of 0.22 Ωcm~2 in air. A laboratory-sized tri-layer cell of NiO-BZCY7/BZCY7/SCS was operated from 500 to 700 ℃ with humidified hydrogen (～3% H_2O) as fuel and the static air as oxidant. A high open-circuit potential of 1.004V, a maximum power density of 259 mW cm~(-2), and a low polarization resistance of the electrodes of 0.14 Ωcm~2 was achieved at 700 ℃.