Journal
RSC ADVANCES
Volume 6, Issue 34, Pages 28451-28457Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra01623e
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Funding
- National Natural Science Foundation of China [21273236]
- Science and Technology Planning Projects of Fujian Province of China [2014H2008, 2015I0008]
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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 N-2 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 m(2) 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.
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