Fabrication and enhanced electrochemical performance of a nitrogen-doped porous graphene/nanometer-sized carbide-derived carbon composite for supercapacitors
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Herein, we fabricated a nitrogen-doped porous graphene/nanometer-sized carbide-derived carbon (NPG/nCDC) composite. In this architecture, the nCDC with a hierarchical pore structure is used as spacer to inhibit the agglomeration of NPG ensuring the in-plane diffusion paths for electrolyte ions and has contribution to the specific surface area and the pore structure of the composite as well. The nano-sized pores existing on the NPG sheets can provide the cross-plane diffusion paths for electrolyte ions. Furthermore, the nitrogen doping to NPG can further enhance the capacitive performance of the composite. Benefiting from these advantages, the NPG/nCDC composites exhibit outstanding supercapacitive performance. Its specific capacitance is up to 336 F g−1 at 5 mV s−1 in 6 mol L−1 KOH electrolyte, and 99.3% capacitance can be maintained even after 10,000 cycles, demonstrating the great potential as the electrode material for supercapacitors.
KeywordsPorous graphene Carbide-derived carbon N-Doped graphene Carbon composite Supercapacitor
The authors thank the financial support of this work by the National Science Foundation of China (NSFC) (No. 50975247), Key Research and Development Program of Hebei Province (No. 17214415), and Hebei Natural Science Foundation (No. E2014203204).
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