NDLI: Superior electric double layer capacitors using micro- and mesoporous silicon carbide sphere

Content Provider	Royal Society of Chemistry (RSC)
Author	Oh, Ilgeun Kim, Myeongjin Kim, Jooheon
Copyright Year	2015
Abstract	Three-dimensional silicon carbide-based frameworks with hierarchical micro and mesoporous structures (MMPSiC) are prepared by employing the template method and carbonization reaction via the aerosol-spray drying method. The mesopores are generated by the self-assembly of a structure-directing agent, while the micropores are derived from the partial evaporation of Si atoms during the carbonization process. MMPSiC has a unique three-dimensionally interconnected micro and mesoporous network; it also exhibits a faster ion-transport behavior and a larger utilization of the surface area of the electric double-layer capacitors. MMPSiC shows a high-charge storage capacity, with a specific capacitance of 253.7 F g−1 in 1 M Na2SO4 aqueous electrolyte at a scan rate of 5 mV s−1. In addition, a specific capacitance of 40.3 F g−1 is measured in the 3-ethyl-3-methylimidazolium bis(trifluorosulfonyl)imide ionic-liquid electrolyte at a scan rate of 5 mV s−1, with an energy density of 68.56 W h kg−1; and ∼98.4% specific capacitance being retained over 20 000 cycles. Such a high supercapacitor performance may arise from a synergistic effect ensured by the dual-pore system, which can provide a large accessible surface area for ion transport/charge storage by the mesopores and a continuous increase of charge accommodation by micropores. These encouraging results demonstrate the great potential of MMPSiC as high-performance electrode materials for supercapacitors.
Starting Page	3944
Ending Page	3951
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	3
Issue Number	7
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta07110g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Mesoporous material Carbonization Self-assembly Capacitance Electrolyte Imide Energy density Supercapacitor Accessible surface area Ion Electrode
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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