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The main features of cyclic voltammograms (CVs) of thin electrochromic films based on a-WO3 were investigated. First, the Metal oxide intercalation films for electrochromic variation of composition relates to a change of Gibbs energy, DG, of the cathode material, which is indicated by variation of the chemical potential, l, of metal atoms in the cathode material with respect to the potential of tance in absorption phenomena, redox capacitance in dV dl=e, where e is the elementary charge. Hence the chemical capacitance per unit area can be written Cch Le2N oxol; ð2Þ where Q LNxe is the charge passed, L is the film thickness, N is the density of the host metal atoms, and x emist*applications [1,2] and positive electrodes for batteries [3] usually show capacitance values far exceeding those corresponding to the electrical double layer at the oxide