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A facile one-pot fabrication of flowerlike graphene-based particles for electric double-layer capacitors.
- Source :
-
Materials Chemistry & Physics . Dec2014, Vol. 148 Issue 3, p631-638. 8p. - Publication Year :
- 2014
-
Abstract
- Flowerlike graphene-based particles had been successfully synthesized from the suspension of graphene oxide (GO) in the aqueous solution of sucrose by one-pot hydrothermal carbonization approach. Porous carbon from sucrose prompted the evolution of graphene from flat-shaped to flowerlike curved morphology, which was confirmed by the observation of scanning electron microscopy and transmission electron microscopy. The graphene-based particles possess large pore volume (0.69 cm 3 g −1 ) and surface area (470.5 m 2 g −1 ), which is about 6 times greater than that of carbonized graphene sheets (79.2 m 2 g −1 ). Electrochemical investigation indicated that the specific capacitance of the particles reached 162 F g −1 at current density of 0.1 A g −1 in 30 wt% KOH aqueous electrolytes and the capacitance maintenance achieved 90% as the current density enlarged 50 times. The keys to the ideal capacitive performance are the abilities to make full utilization of specific surface area of graphene and ensure a quick kinetic process for the diffusion of ions within curved graphene particles with considerable open edges. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02540584
- Volume :
- 148
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Materials Chemistry & Physics
- Publication Type :
- Academic Journal
- Accession number :
- 99062974
- Full Text :
- https://doi.org/10.1016/j.matchemphys.2014.08.028