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Electrochromism is a phenomenon where a material shows reversible and visible change in color that is associated with an electrochemically induced oxidation-reduction reaction.Electrochromic devices have received a great deal of attention for potential applications to display,smart windows,shutters,etc.[1-3] Smart windows and large-area display devices,based on reversibly colored electrochromic materials,have become the subject of many studies around the world because of their potential applications to buildings and automobiles.