Voltammetric and potentiostatic studies of the interface WO3/polyethylene oxide-H3PO4

The electrochemical behavior of WO 3 films in the presence of a proton conducting polymer electrolyte (poyethylene oxide-H 3 PO 4 ) was studied using cyclic voltammetry, potentiostatic and optical density measurements. We have shown that this kind of electrolyte increases the memory effect of the coloured material. The reaction mechanism is made up of two simultaneous reactions: the intercalation of the proton into the host structure and the formation of molecular hydrogen. The latter reaction involves the formation and the superficial diffusion of adsorbed hydrogen.