Impedance analysis and equivalent circuit of an all-plastic viologen based electrochromic device

An all-plastic viologen-based electrochromic device recently developed is electrochemically tested with optic and impedance analysis, revealing its voltage response. An equivalent circuit is proposed to derive the electrical behavior of the material and to relate it with its physical and chemical characteristics. A simple Randles cell achieves the best fitting results for the device operation up to 1.8 V. Diffusion effects become important from 1.1 V to 1.7 V. These fittings will allow future use in displays, in smart glasses for vision impaired people, and other applications, as they will optimize the electronic drivers and signals to be used.