ELECTROOXIDATION OF CO ON PLATINUM CATALYSTS OF DIFFERENT GENESIS FORANALYTICAL PURPOSES

Through methods of Potentiodynamic curves, charging curves, x-ray phot oelectron spectroscopy, and granulometric analysis the effect of the p latinum black preparation technique upon the activity of gas-diffusion electrodes based on these blacks in the electrochemical oxidation of CO was studied. It was shown that in the reduction of colloidal platin um with sodium borohydride an active mass of electrocatalyst is obtain ed, which is superior in its characteristics to the one used in indust ry. The enhanced activity of the electrode based on platinum black obt ained by the suggested technique is related to the partly hydroxylated platinum present on the catalyst surface along the Pt0, and the therm odynamically stable phases CuO and B2O3, as well as to the optimum pro file of the macrograins of platinum black, forming in the process of s ynthesis.