Highly dispersed Pt/WO3/C 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 H-2 and CO stripping. Oxygen reduction on Teflon bonded Pt/WO3/C electrode was investigated under O-2 and air in 0.5 M H2SO4 at 25 and 70 degrees C. Pt/WO3/C was more active for oxygen reduction in sulfuric acid than Pt/C catalyst. The dissolved tungsten compounds (peroxy-tungstate) from the WO3 in the electrode participate in the oxygen reduction as a homogeneous catalyst for the decomposition of H2O2, leading to significantly higher activity of the Pt/WO3/C for oxygen reduction. By coating the electrode with a thin layer Nafion dispersion, continual loss of WO3 by dissolution and diffusion to the bulk electrolyte is avoided.