An electrolyte of 0.5 M H2SO4was used to examinethe hydrogen adsorption and desorption behaviors and investigatethe oxygen reduction activity of Pt/TiO2electrodes. The ECSA of Ptwas evaluated based on the hydrogen desorption peaks appearingbetween -0.295 and 0.105 V, by assuming a charge of 210 C cm−2for the electro-active Pt surface [20].