N/O co-doped hierarchically porous carbon with three-dimensional conductive network for high-performance supercapacitors

Heteroatom doping is a significant modification of carbon materials for electrodes in storage device and co doping has synergistic improvement effect. This work reports a N/O co-doped porous carbon (CPK800) from crosslinking sodium carboxymethyl cellulose and poly (m-phenylene diamine). The material characterization reveals its large specific surface area of 1501.3 m(2) g(-1) with optimum micro- and mesopore distribution, partially graphitized carbon and high N, O concentration. This carbon has 3D interconnected porous structure and internal conducting network providing rapid ion and electron transportation. Take these advantages, it exhibits high capacitance of 358 F/g at 1 A g(-1), an excellent rate retention of 70.8% at a high current density of 20 A g(-1), and superior cyclic stability of 97.8% capacitance retention after 10,000 cycles at 10 A g(-1) as an electrode material in 3 M KOH electrolyte. Moreover, the assembled symmetric supercapacitor device (CPK800//CPK800) delivers a high energy density of 11.5 Wh kg(-1) at a power density of 326.8 W kg(-1) and still have energy density of 8.9 Wh kg(-1) at a very high power density of 6.8 kW kg(-1). The well-developed structure and outstanding electrochemical performance demonstrate the promising potential of CPK800 as electrode material for advanced energy storage devices. (c) 2021 Published by Elsevier B.V.

Automated summary

This study reports a N/O co-doped porous carbon material with excellent electrochemical performance, including high capacitance, excellent rate retention, and superior cyclic stability, demonstrating its promising potential as an electrode material for advanced energy storage devices.