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Design and preparation of carbon-based electrode material with high nitrogen-doping ratio and appropriate density attract much interest for supercapacitors in practical application. Herein, three porous carbon/graphene (NCG, NCG, and NCG) with high doping ratio of nitrogen have been prepared via directly pyrolysis of graphene oxide (GO)/metal-organic coordination polymer (MOCP) composites, which were formed by reacting 4,4'-bipyridine (BPD) with CuCl, FeCl, and ZnCl, respectively. As-prepared NCG, NCG and NCG showed high nitrogen doping ratio of 10.68, 12.99, and 11.21 at. %; and high density of 1.52, 0.84, and 1.15 g cm, respectively. When as-prepared samples were used as supercapacitor electrodes, NCG, NCG and NCG exhibited high gravimetric specific capacitances of 369, 298.5, 309.5 F g, corresponding to high volumetric specific capacitances of 560.9, 250.7, 355.9 F cm at a current density of 0.5 A g, as well as good cycling stability, nearly 100% of the capacitance retained after 1000 cycles even at a large current density of 10 A g. It is expected that the provided novel strategy can be used to develop electrode materials in high performance energy conversion/storage devices.

Morphology-tunable 3D TA/graphene composites are prepared using metal ions as the morphology tuning agent, and they have promising applications in renewable energy storage devices.