Electrochromic iontronic devices based on nanoscale cell membrane-inspired hydrated ion channels in Nafion solid polyelectrolyteBo Li, Jinge Ma, Yanjie Wang, Huajing Fang and Guimin ChenEPL, 128 6 (2019) 68001DOI: https://doi.org/10.1209/0295-5075/128/68001