Dual-functional electrochromic green glass incorporated with PEDOT:PSS /electrochemically exfoliated graphene and cesium tungsten oxide for transmittance modulation and near infrared shielding

Abstract

The components of this dual-functional electrochromic green glass primarily consist of a five-layer structure, which includes two transparent conducting layers, composed of a composite polymer coating (PEDOT:PSS/elctrochemically exfoliated graphene, /cesium tungsten oxide); the electrochromic layer is made up of pussian blue, which belongs to anodic electrochromic materials, and PEDOT:PSS, which itself is a cathodic electrochromic material; separated by a liquid electrolyte layer composed of propylene carbonate /lithium perchlorate, forming an electrochromic device with complementary colors. The coloration efficiency of the device can reach 435.04 cm²C⁻¹, with coloration and bleaching response times of 1.7 s and 0.7 s, respectively. In the near-infrared light range, the electrochromic device combined with a 1wt% cesium tungsten oxide coating can continuously block up to 77.4 % of infrared light transmission, effectively isolating heat radiation outside. In thermal insulation tests, the room temperature with the transparent conducting layer doped with cesium tungsten oxide is about 4 °C lower compared to ordinary glass, indicating a good indoor cooling function. After testing, the device doped with cesium tungsten oxide significantly expands the temperature difference between the colored and bleached states from 4.5 °C to 24.7 °C.