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

Abstract

It is a considerably attractive task to search for new high-performance electrode materials for supercapacitors from pristine coordination polymers. Herein, a one-dimensional (1D) Cu-based coordination polymer ([Cu­(BGPD)­(DMF)2(H2O)], Cu-BGPD; BGPD = N,N′-bis­(glycinyl)­pyromellitic diimide; DMF = dimethylformamide) has been synthesized. When utilized as the electrode material for supercapacitors, in a three-electrode system, the Cu-BGPD electrode delivers a high specific capacitance of 1530 F g–1 (corresponding to a specific capacity of 213 mAh g–1) at 1 A g–1 with a capacitance retention of 95.9% after 2000 cycles at 1 A g–1. Impressively, the asymmetric supercapacitor comprising Cu-BGPD as the positive electrode and the rGO as the negative electrode delivers the maximum energy density of 15.25 Wh kg–1 at a power density of 0.85 kW kg–1. Our research shows that it is also a practical way to develop new high-performance electrode materials of supercapacitors from 1D coordination polymers.