Abstract
A fuel cell anode consisting of NiCu alloy and gadolinia doped ceria cermet has been investigated for CH 4 electro-oxidation. The effect of temperature and potential has been analysed. Impedance spectroscopy measurements have been carried out at different cell potentials. The operating voltage affected both ohmic and polarization resistances. These effects have been attributed to modifications of the anode surface chemistry. The polarization curves obtained in the temperature range from 650°C to 800°C showed the best cell performance at 800°C. Finally, the exhaust gases from the anode compartment were analysed by gas chromatography. No significant carbon deposition was observed after prolonged operation at 750°C in the presence of a humidified stream.
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