By using spray-drying treated ammonium metatungstate (AMT) as precursor

the hollow globular tungsten carbide (WC) catalysts were prepared by sphere miniaturation-gas-solid reaction

and then the catalysts Pt/WC and Pt/C were prepared by reduction of platinum salts with HCHO in H2O solvent.The size of Pt metal particles in both catalysts was characterized by XRD and SEM

and the results indicated that Pt metal particles were 10.6 nm in Pt/WC while they were 2.8 nm in Pt/C. The measured polarisation curves of oxygen reduction reaction (ORR) in the gas diffusion electrode showed that Pt/WC oxygen-diffusion electrode exhibited a better electro-catalytic properties than Pt/C in acid solution

as shown by the higher current density at the same potential and initial potential of oxygen reduction positive.Then the possible reason and electro-catalytic mechanism were discussed

and the AC impedance spectra of gas diffusion electrode with Pt/WC under the controlled conditions were also studied.