Asymmetric Supercapacitor Based on a 1D Cu-Coordination Polymer with High Cycle Stability

A 1D Cu-based coordination polymer wassynthesized, exhibitinga high capacitance and excellent cycling stability as the electrodematerial of supercapacitors. It is a considerably attractive taskto search for new high-performanceelectrode materials for supercapacitors from pristine coordinationpolymers. Herein, a one-dimensional (1D) Cu-based coordination polymer([Cu(BGPD)(DMF)(2)(H2O)], Cu-BGPD; BGPD = N,N & PRIME;-bis(glycinyl)pyromellitic diimide;DMF = dimethylformamide) has been synthesized. When utilized as theelectrode material for supercapacitors, in a three-electrode system,the Cu-BGPD electrode delivers a high specific capacitance of 1530F g(-1) (corresponding to a specific capacity of 213mAh g(-1)) at 1 A g(-1) with a capacitanceretention of 95.9% after 2000 cycles at 1 A g(-1).Impressively, the asymmetric supercapacitor comprising Cu-BGPD asthe positive electrode and the rGO as the negative electrode deliversthe maximum energy density of 15.25 Wh kg(-1) at apower density of 0.85 kW kg(-1). Our research showsthat it is also a practical way to develop new high-performance electrodematerials of supercapacitors from 1D coordination polymers.