Abstract
The effect of the Pt film thickness, in the range between 0.5 μm and 9 μm, on the polarization characteristics of the anode in a H2–H2O gas mixture was studied using a fixed film Pt electrode at around 1273 K. The smaller interface resistance and the smaller DC overvoltage were obtained from the thinner Pt film. It was considered that the effect of the Pt film thickness is due to structural change of the Pt film with the thickness based on a model fitting. The anodic current was proportional to P1/4H2 but not affected by PH2O. This agreed with those obtained at the lower temperature.
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