A facile one-pot fabrication of flowerlike graphene-based particles for electric double-layer capacitors

作者：Xia, Xiaohong; Ma, Qian; Yi, Shangqi; Chen, Hui; Liu, Hongbo^*; Chen, Yuxi; Yang, Li

来源：Materials Chemistry and Physics, 2014, 148(3): 631-638.

DOI：10.1016/j.matchemphys.2014.08.028

• Microporous materials
• X-ray diffraction topography
• Electron microscopy
• Nanostructures
• Electrochemical properties

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.

• 出版日期2014-12-15
• 单位湖南大学