Adsorption of methanol on Pt — some comments on the recent work of V.E. Kazarinov, G.Ya. Tysyachnaya and V.N. Andreev

Abstract

Adsorption of methanol on Pt electrodes has been re-examined in the light of the new data given by Kazarinov et al. The lack of potential dependence of methanol adsorption in the region from ca. 0.2 to 0.5 V observed by Kazarinov et al. has been confirmed; the reasons of the previous discrepancies have been discussed. Kinetics of methanol adsorption has been studied using electrochemical and radiochemical methods; no simple correlation between the results has been found. Langmuir's kinetic conditions are more favourable than Elovich's ones but formally Elovich's isotherm is obeyed for higher surface coverage values. The coulometric determination of the number of electrons involved in the oxidation of one chemisorbed molecule has confirmed our previous data. Thus, the nature of the chemisorbed species remains still an open question.