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| A carbon-based counter electrode enhances the operation and durability of electrochromic windows (ECWs), especially against UV radiation that would be encountered in automobile or architectural applications. The electrode is substantially transparent. While experiments were carried out with tungsten oxide as the electrochromic material, the technology achieves high electrochromic efficiency without limitation as to the type of electrochromic material used. Carbon-based electrodes can store charges in an electric double layer irrespective of their charge polarities, and do not experience intercalation. ECWs fabricated with the carbon electrode technology have proven exceptionally durable. Electrochromic windows change color with good color contrast on current conduction and current interruption. The material can only be bleached when the current flows in the opposite direction. A proprietary screen printing technology deposits minute carbon-based electrodes over a large area in an array of micrometer-scale parallel lines or in a dot formation, so that when the window is clear (bleached) as a vehicle would use, transmittance of visible light is approximately 39%, and when colored, it is reduced to 10%. For building materials, this transmissivity becomes about 50%-60%.Electrochemically induced color materials proposed light-modulating devices panels windows mirrors basically pair transparent electrical conductive substrates ionic electrochromic (EC) large number structures reported broad range applications |
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