Intermediate-to-low Temperature Protonic Ceramic Membrane Fuel Cells With Ba_(0.5)sr_(0.5)co_(0.8)fe_(0.2)o_(3-δ)-bazr_(0.1)ce_(0.7)y_(0.2)o_(3-δ) Composite Cathode

摘要

The perovskite-type Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ)-BaZr_(0.1)Ce_(0.7)Y_(0.2)O_(3-δ) (BSCF-BZCY) composite oxides were synthesized by a modified Pechini method and examined as a novel composite cathode for intermediate-to-low temperature protonic ceramic membrane fuel cells (ILT-PCMFCs). Thin proton-conducting BaZr_(0.1)Ce_(0.7)Y_(0.2)O_(3-δ) (BZCY) electrolyte and NiO-BaZr_(0.1)Ce_(0.7)Y_(0.2)O_(3-δ) (NiO-BZCY) anode functional layer were prepared over porous anode substrates composed of NiO-BaZr_(0.1)Ce_(0.7)Y_(0.2)O_(3-δ) by a one-step dry-pressing/co-firing process. A laboratory-sized quad-layer cell of NiO-BZCY/ NiO-BZCY(～50 μm)/BZCY(～20 μm)/BSCF-BZCY(～50 μm) was operated from 550 to 700℃ with humidified hydrogen (～3% H_2O) as fuel and the static air as oxidant. A high open-circuit potential of 1.009 V, a maximum power density of 418 mW cm~(-2), and a low polarization resistance of the electrodes of 0.10 Ω cm~2 was achieved at 700℃. These investigations have indicated that proton-conducting BZCY electrolyte with BSCF perovskite cathode is a promising material system for the next generation solid oxide fuel cells (SOFCs).