Figure 4
(a) Ultraviolet–visible (UV–vis) spectra of the TPPA-TPB PA blending electrochromic devices (ECDs; air as reference) with different backbone structures (aromatic Blending-O and aliphatic Blending-A) on indium tin oxide (ITO)-coated glass substrates (coated area: 25 mm × 20 mm; thickness: 1 μm; containing 0.5 mg heptyl viologen (HV) as a cathodic electrochromic material (ECM)) in propylene carbonate with 3 wt% LiBF4 as the supporting electrolyte, and (b) photos of the ECDs at their bleached states and colored states.
