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Abstract

Nitrogen (N)-doped graphene (NG) sheets were prepared using (NH4)2CO3 and an aqueous dispersion of graphene oxide (GO) by an eco-friendly hydrothermal reaction. The in situ produced ammonia played an important role in the simultaneous nitrogen doping, the reduction and exfoliation of GO. The (NH4)2CO3/GO mass ratio and reaction temperature were varied to investigate the effects on the N doping level. The elemental analysis determined from the X-ray photoelectron spectroscopy showed that the nitrogen content of the NG was about 10.1 at.% and the oxygen content decreased significantly due to the hydrothermal reduction of GO. The electrochemical performances of the NG sheets increased with increasing doped N content. The highest specific capacitance of 295 F g-1 at a current density of 5 A g-1 and the highest specific surface area of 412 m2 g-1 were observed with the sample processed at 130 oC. The retention of the specific capacitance was maintained at 89.8% after 5000 charge–discharge cycles. These results imply that NG sheets obtained by this simple eco-friendly approach are suitable for use in high performance energy storage electrode materials.

Item Type:	Article
Subjects:	Materials
Depositing User:	Dr. Sarita Ghosh
Date Deposited:	22 Mar 2016 10:58
Last Modified:	22 Mar 2016 10:58
URI:	http://cmeri.csircentral.net/id/eprint/53

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