Metal-organic coordination polymer bearing dual-redox centra enables high-performance electrochromic supercapacitor

Indicative electrochromic supercapacitors have garnered great attention in intelligent power supplies and smart windows, due to their ability to indicate the energy states through optical color changes. Herein, a networked metal–organic coordination polymer bearing dual-redox centra (CONASH) was successfully prepared by coordination interaction of Fe salts with triphenylamine(TPA)-functionalized phenanthroline ligands through the liquid–liquid interface self-assembly strategy. The resultant uniform CONASH film exhibits improved electrochromic and energy-storage performance, attributed to the synergistic effects between the dual-redox centra of Fe ion and TPA moiety. Furthermore, a sandwich-structured electrochromic energy-storage device was fabricated by combining CONASH cathodic film, gel electrolyte, and V2O5 anodic material. The resultant device illustrates a proper optical contrast of 54%, a fast response speed of 5.5 s/4.8 s, a capacitance of 8.12 mF/cm2, excellent rate performance, and good cycling durability (73% retention of capacitance and 95% retention of optical contrast after 6000 charging/discharging cycles). The design principles proposed in this study not only provide new insights for the preparation of high-performance electrochromic supercapacitors materials but also demonstrate the potential applications of CONASH for energy recovery and reuse.