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

[Display omitted] • A novel metal–organic coordination polymer with dual-redox centra was synthesized. • Assembled device shows electrochromic and energy-storage performance simultaneously. • Good cycling durability was revealed due to the synergistic effect of Fe2+ and TPA. 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 V 2 O 5 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. [ABSTRACT FROM AUTHOR]