fig2

Figure 2. Strategies for fabricating active layers and electrolytes. (A) Optical photographs of WO₃ layers of varied thicknesses / W layer / Au (50 nm) on Nylon 66 substrate. Reproduced with permission^[68]. Copyright 2023, Elsevier; (B) The ECD structure is based on working/counter(P3MT/PB) EC pair electrodes. Reproduced with permission^[61]. Copyright 2019, Elsevier; (C) The ECD structure is based on the WO₃/Zn electrodes. Reproduced with permission^[72]. Copyright 2020, Wiley-VCH; (D) The excellent optical and mechanical performance of DES-based gel used in ECD. Reproduced with permission^[20]. Copyright 2022, Wiley-VCH; (E) The high transmittance, stretchable, and favorable electrochemical stability of ionogels used in ECD. Reproduced with permission^[83]. Copyright 2023, Wiley-VCH; (F) Chemical structures of components in EC electrolyte gel and structure of EC devices. Reproduced with permission^[32]. Copyright 2018, Elsevier. ECD: Electrochromic display; P3MT: poly(3-methylthiophene); PB: Prussian blue; EC: electrochromic; DES: deep eutectic solvents.