Über den einfluss der temperatur auf einige elektroden-prozesse, die durch stark adsorbierbare oberflächenaktive stoffe gehemmt werden

Abstract

The influence of temperature on inhibited electrode reactions of some cations in acidic solutions was studied. As inhibitors, tribenzylamine, tetrabutylammonium-sulphate and Triton X-45 were used. From the analysis of i-t curves it can be concluded that the time v, necessary for the complete coverage of the electrode, decreases with rising temperature. The diminution of v -values is due to the increased diffusion of surface-active substance towards the electrode. The rate constant of the electrode reaction on the covered surface, ₁K_e, is either temperature-independent or increases with rising temperature, according to the character of the electrode reaction and the applied potential. In the latter case the temperature dependence of ₁k_e fullfils the Arrhenius equation. So far as ₁K_e does not increase appreciably with temperature the inhibited polarographic wave is practically temperature-independent.