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The hydrogen electrode on an interface platium/dimethyl sulphoxide + 0.5 M KClO 4 solution was examined from both the thermodynamic and kinetic aspect, using HCl as a proton source. The equilibrium potential was shown to obey a Nemstian dependence on concentration. The voltammograms recorded using a rotating platinum disc electrode evidenced that the cathodic evolution of hydrogen proceeds under mixed, activation-diffusion control. The diffusion coefficient of the proton was determined to amount to 4.5×10 - 6 cm 2 s - 1 . In the region of activation control, a Tafel slope of about 0.110 V dec - 1 was estimated, which indicates that the Volmer reaction is the rate determining step.

Thermodynamic and kinetic behavior of hydrogen electrode in a solution of O. 5 M KClO4 in dimethyl sulphoxide