Nanographene derived from carbon nanofiber and its application to electric double-layer capacitors

Autor: Satoshi Mitani, Dinesh Rangappa, Marappan Sathish, Atsushi Unemoto, Takaaki Tomai, Itaru Honma
Rok vydání: 2012
Předmět:
Zdroj: Electrochimica Acta. 68:146-152
ISSN: 0013-4686
DOI: 10.1016/j.electacta.2012.02.034
Popis: The fascinating properties of graphene are attracting considerable attention in engineering fields such as electronics, optics, and energy engineering. These properties can be controlled by controlling graphene's structure, e.g., the number of layers and the sheet size. In this study, we synthesized nanosized graphene from a platelet-type carbon nanofiber. The thickness and size of nanographene oxide are around 1 nm and 60 nm and we obtained nanographene by hydrazine reduction of nanographene oxide. We applied the nanographene to an ionic-liquid electric double-layer capacitor (EDLC), which exhibited a much larger capacitance per specific surface area than an EDLC using conventional activated carbon. Furthermore, the capacitance increased significantly with increasing cycle time. After 30th cycle, the capacitance was achieved 130 F g −1 , though the surface area was only 240 m 2 g −1 . These results suggest that nanographene structure induce the capacitance enhancement.
Databáze: OpenAIRE