Using a pressure cell equipped with an Ag\AgCl\0.1 M KClexternal pressure-balanced reference electrode, electrochemical oxidation of methanol was potentiostatically studied on a Pt electrode under hot aqueous conditions (343-523 K), and the apparent activation energy for methanol was calculated. Below 0.4 V vs. RHE, the activation energies were 60 and 30 kJ mol(-1) for 0.1 and 1 mol kg(-1) methanol, respectively. Above 0.5 V vs. RHE, the activation energy was 60 kJ mol(-1) for every experimental methanol concentration and the reaction order was calculated as 0.4 with respect to methanol concentration.