WO₃/PANI核壳结构反蛋白石薄膜的电致变色性能

A conductive polymer polyaniline(PANI) layer was introduced on the surface of the inverse opal structure tungsten trioxide(IO-WO₃) film by the successive ionic layer adsorption and reaction, then a unique core-shell inverse opal structure WO₃/PANI(IO-WO₃/PANI) film was fabricated. The morphology, composition, and electrochemical behavior of the IO-WO₃/PANI film were studied and compared with the IO-WO₃ film. When the potential scan ranged from -0.6 V to 1.0 V, the IO-WO₃/PANI composite film showed different colors under different voltage states, namely blue(1.0 V), green(0.2 V), light green(0 V) and blue-violet (-0.6 V). Compared with the IO-WO₃ film, the electrochromic performance of the IO-WO₃/PANI film is signi-ficantly improved. The coloring and fading response times are 3.8 and 6.14 s, respectively, and the color change efficiency(CE) value is 201.1 cm²/C. The improvement of electrochromic performance is mainly attri- buted to the formation of the donor-acceptor system and the hierarchically porous structure in the core-shell inverse opal, which enable rapid ion diffusion and provide a larger surface area for charge transfer reactions. The results show that the IO-WO₃/PANI core-shell inverse opal film is a potential multicolor electrochromic material and has broad application prospects in the future.