A multicolor electrochromic device having hybrid capacitor architecture with a porous carbon electrode

Abstract

With the progress and development of electrochromic (EC) technologies in various applications, the demand for multicolor EC devices (ECDs) has been increasing, and it has a huge connection with the expansion of the market. This paper reports on a novel multicolor ECD with a simple hybrid capacitor architecture (glass/ITO/multi-EC gel/carbon/glass), containing both anodic and cathodic EC materials. By employing the carbon capacitor electrode having porous morphology and large surface area as a counter electrode, even large charge amount consumed by multiple redox pairs’ cathodic materials was adequately compensated. The successful fabrication of the device, consequently, it provides four well-defined colors (white, green, yellow, and red) in one single device.