Electrochemical Behavior of Ni-CZO Cermet AnodesPrepared By Glycine Nitrate Process

摘要

The impact of H_2O for H_2 oxidation on Ni-Ce_(0.75)Zr_(0.25)O_2 (Ni-CZO)anode material synthesized by glycine-nitrate-process has beeninvestigated under dry and wet H_2 fuel atmospheres over a range ofoperating conditions using yttria-stabilized zirconia (YSZ)electrolyte. Using electrochemical impedance spectroscopy (EIS),the polarization resistance (comprised of high frequency (HF) andlow frequency (LF) features) of Ni-CZO symmetrical cells (Ni-CZO/YSZ/Ni-CZO) has been studied. The LF arc was almostnegligible at all the operating temperatures in wet condition, andthe HF arc linearly increased with time at 800°C only in drycondition. The EIS response in dry and wet H_2 conditions clearlyexhibited that water vapor enhanced the dissociative adsorptionand surface diffusion of hydrogen and achieved stableelectrochemical performance at 3PB on the Ni-CZO cermet.