Electrochemical study of molybdenum oxide film electrodes

Several different electrochemical techniques were used to study the redox reaction in an aqueous sulphuric acid solution at molybdenum oxide film electrode. It was determined by chronopotentiometry, along with cyclic voltammetry and impedance spectroscopy, that in the redox process, the H+ ion combines with an electron from the film to form an intermediate before entering the film, and that the transport of the H atom within the layer of oxide occurs purely by diffusion. The diffusion coefficient of the H atom was deduced from these data (D = 10(-12) cm(2) s(-1)). (C) 2003 Elsevier Ltd. All rights reserved.