Research process in self-powered electrochromic devices

The electrochromic devices (ECDs) can achieve reversible color change under the applied electric field. Generally, an external circuit is necessary to provide driving voltage for ECDs, which limits the practical application to some extent. In recent years, researchers have paid attention to the integration of power supply devices and ECDs to prepare self-powered ECD, and remarkable progress has been made. Various kinds of energy, such as solar energy, chemical energy and mechanical energy, can be used as the driving energy, which effectively meet the needs and greatly promote the development of the ECDs. Here, the progress in self-powered ECDs is reviewed and the practical application of the self-powered ECDs is prospected.