Anode-supported BaZr0.8Y0.2O3-δ membranes by tape casting and suspension spraying

Dense BaZr0.8Y0.2O3-delta (BZY) proton-conducting electrolyte membranes are successfully fabricated on NiO-BaZr0.1Ce0.7Y0.2O3-delta(NiO-BZCY) using tape casting combined with suspension spraying technique. The NiO-BZCY anode substrates were prepared by the tape-casting method and the BZY electrolyte membranes were prepared on the NiO-BZCY anodes by suspension spraying. The thermal decomposition of the anode green tape prepared by tape casting was investigated by thermogravimetry differential thermal analysis while the phase structure and the morphology of the an ode/electrolyte bi-layers were characterized by X-ray diffraction (XRD) and scanning F, electron microscopy (SEM). No obvious reaction was found between NiO and BZCY in anode substrates and gas -tight BZY membranes were achieved after co-sintering at 1450 degrees C. With Sm0.5Sr0.5CoO3-delta-Ce0.8Sm0.2O2-delta(SSC-SDC)as the composite cathode, a maximum power density of 121 mW cm(-2) was obtained at 650 degrees C for the single cell with 23 mu m thick BZY electrolyte. Resistances of the tested cell were investigated under open circuit conditions at different operating temperatures by impedance spectroscopy.