The wide-band reflective electrochromic device based on porous gold foil possesses wide solar radiation absorption regulation capabilities

The conductive layer of the conductive gold electrode, firmly combined with the flexible substrate and possessing high reflectance, is key factor in achieving wide-band regulation of electrochromic devices. However, existing preparation methods such as physical vapor deposition and chemical gold plating are costly and complex. In response to the wide-band regulation requirements of electrochromic devices, a flexible conductive gold electrode with high reflectance was prepared using gold foil as the conductive material. This process is simple and incurs no processing loss. A polyaniline (PANI) film was deposited on the surface of the flexible conductive gold electrode through cyclic voltammetry, and a PANI-based electrochromic device was subsequently prepared. The electrochromic device exhibits striking color changes in visible light, including bright yellow, green, and dark green. Moreover, it demonstrates excellent regulation performance in the near-infrared band, with a reflectance change of up to 72.5 %. In the mid-infrared range, it shows good emissivity regulation performance, with an emissivity change reaching 0.45. This device has promising application prospects in solar radiation regulation. Demonstration experiments verified that in the solar radiation band, it has a solar absorption rate change range of 0.34–0.90. Under standard sunlight irradiation, the device achieves a temperature regulation of 9.2 °C.