Abstract
The electrochromic properties of tungsten trioxide thin films made by anodic oxidation of W with pulsed current are described. The formation of oxide on a metallic substrate instead of a classical indium-tin oxide (ITO) transparent electrode improves both the response time and the energy consumption of the cell by considerably reducing the ohmic drop across the electrochromic electrode. The results clearly show that good reversibility, high coloration efficiency and fast response time are obtained with this material, which iscrystalline and contains water molecules. Study of the coloration kinetics shows that the current flowing through the cell is controlled by a resistance and not by a charge transfer process.
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