Journal
ACS NANO
Volume 11, Issue 4, Pages 4009-4016Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b00553
Keywords
vertically aligned; graphene; high power; micro-supercapacitors; on-chip; energy storage; electrochemical capacitors
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Funding
- National Natural Science Foundation of China [51572259]
- Ministry of Science and Technology of China [2016YBF0100100, 2016YFA0200200]
- Natural Science Foundation of Liaoning Province [201602737]
- Thousand Youth Talents Plan of China
- DICP [Y5610121T3]
- China Postdoctoral Science Foundation [2016M601349]
- DICP
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Interfacial integration of a shape-engineered electrode with a strongly bonded current collector is the key for minimizing both ionic and electronic resistance and then developing high-power supercapacitors. Herein, we demonstrated the construction of high power micro-supercapacitors (VG-MSCs) based on high-density unidirectional arrays of vertically aligned graphene (VG) nanosheets, derived from a thermally decomposed SiC substrate. The as-grown VG arrays showed a standing basal plane orientation grown on a (000 (1) over bar) SiC substrate, tailored thickness (3.5-28 mu m), high-density structurally ordering alignment of graphene consisting of 1-5 layers, vertically oriented edges, open intersheet channels, high electrical conductivity (192 S cm(-1)), and strong bonding of the VG edges to the SiC substrate. As a result, the demonstrated VG-MSCs displayed a high areal capacitance of similar to 7.3 mF cm(-2) and a fast frequency response with a short time constant of 9 ms. Furthermore, VG-MSCs in both an aqueous polymer gel electrolyte and nonaqueous ionic liquid of 1-ethyl-3-methylimidazolium tetrafluoroborate operated well at high scan rates of up to 200 V s(-1). More importantly, VG-MSCs offered a high power density of similar to 15 W cm(-3) in gel electrolyte and similar to 61 W cm(-3) in ionic liquid. Therefore, this strategy of producing high-density unidirectional VG nanosheets directly bonded on a SiC current collector demonstrated the feasibility of manufacturing high-power compact supercapacitors.
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