An electrolyte of 0.5 M H2SO4 was used to examine the hydrogen adsorption and desorption behaviors and investigate the oxygen reduction activity of Pt/TiO2 electrodes. The ECSA of Pt was evaluated based on the hydrogen desorption peaks appearing between -0.295 and 0.105 V, by assuming a charge of 210 C cm−2for the electro-active Pt surface [20].