Effects of mass transfer on kinetics of hydrogen oxidation reaction at Nafion/Pt-black thin-film electrodes

► The effect of H2 diffusion in the Pt catalyst layer on the overall H2 oxidation reaction rate was accounted for using the effectiveness factor. ► A theoretical description of the rotating thin-film method for the determination of the intrinsic exchange current density was presented. ► The corrected exchange current density of the Pt-black catalyst was thus determined to be 0.49 mA/cm2.