A new Co-ZIF derived nanoporous cobalt-rich carbons with high-potential-window as high-performance electrodes for supercapacitors

In this work, a Co-ZIF material and the derived nanoporous cobalt-rich carbons by direct carbonization of this Co-ZIF material were synthesized and used as electrode materials for supercapacitors . This ZIF material exhibited a high specific capacitance of 160.3 F g −1 at 0.5 A g −1 , an excellent rate capability (73.72 F g −1 at 10 A g −1 ), and a good cycling stability with 100% of its initials specific capacitance after 8000 cycles. In addition, the obtained derived nanoporous carbons displayed ideal capacitor behaviors and were promising electroactive materials for supercapacitors at low current density . The nanoporous carbon obtained at 650 °C possessed a highest specific capacitance of 393 F g −1 at 0.5 A g −1 and a wide potential application range of −1.0–0.33 V. In addition, a symmetric supercapacitor device consisting of Z-C-650 and activated carbon exhibited a maximum energy density of 61.23 Wh Kg −1 at a power density of 700 W kg −1 and predicted that Z-C-650 could be used as a potential energy storage material .