Oxygen Reduction on Teflon Bonded Pt/WO[sub 3]/C Electrode in Sulfuric Acid

Highly dispersed was prepared by freeze-drying followed by hydrogen reduction. The catalyst particle size was examined by transmission electron microscopy and X-ray diffraction line broadening technique as well as electrochemical Pt surface area measurement by and CO stripping. Oxygen reduction on Teflon bonded electrode was investigated under and air in 0.5 M at 25 and 70°C. was more active for oxygen reduction in sulfuric acid than Pt/C catalyst. The dissolved tungsten compounds (peroxy-tungstate) from the in the electrode participate in the oxygen reduction as a homogeneous catalyst for the decomposition of leading to significantly higher activity of the for oxygen reduction. By coating the electrode with a thin layer Nafion dispersion, continual loss of by dissolution and diffusion to the bulk electrolyte is avoided.