Abstract
The anode material BaZr 0.1Ce 0.7Y 0.1Yb 0.1O 3− δ (BZCYYb) for solid oxide fuel cells (SOFCs) is prepared by solid state reaction method and its chemical compatibility with Y 2O 3 stabilized ZrO 2 (YSZ) is evaluated. The electrochemical performance of the pure and Pd- and Cu 0.5Pd 0.5-impreganated BZCYYb electrodes is characterized in the temperature range between 650 and 750 °C by AC impedance spectroscopy in H 2 and/or CH 4 atmospheres, respectively, under the condition of open circuit. It is confirmed that the BZCYYb is chemically compatible with the YSZ at temperatures below 1000 °C. The polarization resistance of the BZCYYb anode in H 2 is decreased from 2.08 to 0.51 Ω cm 2 as the measuring temperature increases from 650 to 750 °C with an activation energy of 117 kJ mol −1. With Pd- or Cu 0.5Pd 0.5-impregnation, the polarization resistance of the BZCYYb electrode in H 2 is reduced significantly to approximately 0.40 Ω cm 2 at 650 °C and 0.12 Ω cm 2 at 750 °C. With dry CH 4 as the fuel, the polarization resistance of the Pd- and Cu 0.5Pd 0.5-impregnated BZCYYb anodes is obviously increased below 1.00 Ω cm 2 at 650 °C and 0.22 Ω cm 2 at 750 °C. Both Pd and Cu 0.5Pd 0.5 impregnations are equivalently effective in enhancing the electrochemical performance of the BZCYYb anode.
Published Version
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