Issue 34, 2016, Issue in Progress

Constructing nitrogen-doped nanoporous carbon/graphene networks as promising electrode materials for supercapacitive energy storage

Abstract

Nitrogen-doped nanoporous carbon/graphene networks (NPC/G) have been prepared by zeolitic imidazolate frameworks (ZIF-8) homogeneously encapsulated in graphene oxide (GO) networks, which were carbonized at high-temperature under a N2 atmosphere and washed to get rid of impurities. The obtained NPC/G composites are highly graphitizing and exhibit a high specific surface area up to 703 m2 g−1. By optimizing the annealing conditions, the nanoporous frameworks derived from ZIF-8 can be effectively maintained, which are beneficial for electrolyte ion adsorption and transportation. Furthermore, the NPC/G composites are used as electrode materials for supercapacitive energy storage and show a high specific capacitance of 235 F g−1 at a current density of 1 A g−1, which is larger than that of NPCs and rGO. This provides a new route for designing novel structures to improve electrochemical performance. More interestingly, these electrode materials also present excellent rate capability and 85% retention of its initial capacitance after 1000 cycles in 1 M KOH aqueous solution.

Graphical abstract: Constructing nitrogen-doped nanoporous carbon/graphene networks as promising electrode materials for supercapacitive energy storage

Supplementary files

Article information

Article type
Paper
Submitted
19 Jan 2016
Accepted
03 Mar 2016
First published
04 Mar 2016

RSC Adv., 2016,6, 28451-28457

Constructing nitrogen-doped nanoporous carbon/graphene networks as promising electrode materials for supercapacitive energy storage

Y. Zhu and Y. Tao, RSC Adv., 2016, 6, 28451 DOI: 10.1039/C6RA01623E

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