Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 15, Issue 6, Pages 1179-1184Publisher
SPRINGER
DOI: 10.1007/s10008-010-1183-9
Keywords
Exfoliated-graphite nanosheets; Carbon nanotubes; Hybrid; Conducting networks; Supercapacitors
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Funding
- Chinese Academy of Sciences
- National Natural Science Foundation of China [20901044, 20971077, 20902052]
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Nanostructured hybrid material of exfoliated graphite nanosheets and carbon nanotubes (GNSNT) served as supercapacitor electrode materials was presented. The nanostructured hybrid was prepared by a facile chemical reduction method. The hybrid material was characterized by X-ray diffraction technique, transmission electron microscopy, scanning electron microscopy, cyclic voltammetry, galvanostatic charge/discharge cycling, and four-point probe conductivity measurement to represent a well-defined nanostructure possessing a vast number of active sites and delivering the ingredients for a fast effective charge separation network. Our results clearly demonstrated that the hybrid possess a superior performance. A specific capacitance value 266 F/g was obtained for GNSNT hybrid electrode at a current density of 0.1 A/g, while it was only 185 F/g for exfoliated graphite nanosheets (GNS). At a higher current density of 2 A/g, the GNSNT electrode still keeps a specific capacitance of 220 F/g, which is more than double that of GNS. This synergistic effect of the nanostructured hybrid material offers an effective network for charge separation and therefore renders a significantly enhanced specific capacitance and rate capability.
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