Influence of a thin gold surface layer on the electrochromic behavior of WO3 films

A new WO3 electrochromic cell structure is described that gives rise to an enhanced rate of coloration. In the electrochromic cells described, a thin gold film has been deposited upon the WO3 film, enabling potentials to be measured or applied at the WO3-electrolyte interface. By applying external voltages on the gold film during coloration and bleaching, the response times have been decreased by a factor of 20 to less than 50 ms.