Doping engineering of the flexible polyaniline electrochromic material through H2SO4-HClO4 multiple acids for the radiation regulation in snow environment

Flexible polyaniline films doped by H2SO4-HClO4 multiple acids were synthesized and their electrochromic mechanism was studied for the first time from the aspects of polarons and roughness by means of optical characterizations. The electrochromic device based on the doped polyaniline films as the active material exhibits ∆e of 0.47 in 8-14 μm and reflectivity higher than 80% in 250-400 nm, which can be integrated with the white snow environment in the UV-vis-infrared spectroscopy due to the sunlight scatter from the abadundant micropores. In addition, the device exhibits superior fast electrochromic behavior and stability of more than 200 cycles without compromising its performance. More importantly, Finite-element method and experimental results demonstrate that the device can achieve thermal management upon flat and twisted configuration. The flexible device shows promise for a broad range of potential application in optical and thermal regulation systems.