1. Characterization of Cu₃(HHTP)₂ films

2. XPS spectrum and poresize distribution of Cu₃(HHTP)₂

3. (a) Transmittance at 800 nm wavelength for Cu₃(HHTP)₂ films with different thicknesses at constant voltages of -0.9 and 0.4 V in [EMIm]BF₄ with inset photos showing 20C film at -0.9 V and 0.4 V ; (b) UV-Vis transmission spectra of 20C films measured in various electrolytes at wavelength from 300 to 800 nm; (c) Temporal response of the transmittance of 20C films measured in various electrolytes; (d) Coloring efficiencies of 20C films in various electrolytes, respectively

4. Cyclic voltammetry curves of 20C films at scan rates from 10 to 70 mV∙s^-1 in (a) LiClO₄/PC, (b) NaClO₄/PC solution, (c) [EMIm]BF₄, and (d) [BMIm]BF₄ with inset showing peak current at different scan rates (i_p) as a function of square root of the scan rate (V^1/2)); (e) Nyquist impedance data (dots) and corresponding fitting results (lines) of 20C films in various electrolytes, respectively with inset showing corresponding equivalent circuit; (f) Calculated diffusion coefficients of 20C films in various electrolytes from electrochemical impedance spectroscopy and cyclic voltammetry, respectively

5. Photos of (a) bleaching state and (b) coloring state of Cu₃(HHTP)₂ EC device, and (c) UV-Vis transmission spectra of Cu₃(HHTP)₂ EC devices at voltages of +3 and -3 V

6. (a) Structure diagram of Cu₃(HHTP)₂ and poly (3,4-ethylene dioxythiophene) (PEDOT) electrochromic multiple device, and (b) UV-Vis transmission spectra of multiple devices at voltages of +3 and -3 V