Multifunctional hydrogel enables extremely simplified electrochromic devices for smart windows and ionic writing boards

Abstract
A much simplified electrochromic structure is designed based on a multifunctional ionic hydrogel. The three-layered structure exhibits significant color change with large transmittance modulation and high coloration efficiency. Moreover, an ionic writing board is developed with the hydrogel to realize the first rewritable electrochromic display.
Funding Information
  • National Natural Science Foundation of China (61471290, 61631166004)
  • China Postdoctoral Science Foundation (2017M620447)