Conjugated Copper‐Catecholate Framework Electrodes for Efficient Energy Storage

A conjugated copper(II) catecholate based metalorganic framework (namely Cu-DBC) was prepared using a D2-symmetric redox-active ligand in a copper bis(dihydroxy) coordination geometry. The p-d conjugated framework exhibits typical semiconducting behavior with a high electrical conductivity of ca. 1.0 Sm1 at room temperature. Benefiting from the good electrical conductivity and the excellent redox reversibility of both ligand and copper centers, Cu-DBC electrode features superior capacitor performances with gravimetric capacitance up to 479 Fg1 at a discharge rate of 0.2 Ag1. Moreover, the symmetric solid-state supercapacitor of Cu-DBC exhibits high areal (879 mFcm2) and volumetric (22 Fcm3) capacitances, as well as good rate capability. These metrics are superior to most reported MOF-based supercapacitors, demonstrating promising applications in energy-storage devices.