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Supercapacitors based on nitrogen-doped reduced graphene oxide and borocarbonitrides

Gopalakrishnan, K and Moses, Kota and Govindaraj, A and Rao, CNR (2013) Supercapacitors based on nitrogen-doped reduced graphene oxide and borocarbonitrides. In: SOLID STATE COMMUNICATIONS, 175 (SI). pp. 43-50.

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Official URL: http://dx.doi.org/10.1016/j.ssc.2013.02.005

Abstract

Nitrogen-doped reduced giaphene oxide (RGO) samples with different nitrogen content, prepared by two different methods, as well as nitrogen-doped few-layer graphene have been investigated as supercapacitor electrodes. Two electrode measurements have been carried out both in aqueous (6 M KOH) and in ionic liquid media. Nitrogen-doped reduced graphene oxides exhibit satisfactory specific capacitance, the values reaching 126 F/g at a scan rate of 10 mV/s in aqueous medium. Besides providing supercapacitor characteristics, the study has shown the nitrogen content and surface area to be important factors. High surface-area borocarbonitrides, BxCyNz, prepared by the urea route appear to be excellent supercapacitor electrode materials. Thus, BC4.5N exhibits a specific capacitance of 169 F/g at a scan rate of 10 mV/s in aqueous medium. In an ionic liquid medium, nitrogen-doped RGO and BC4.5N exhibit specific capacitance values of 258 F/g and 240 F/g at a scan rate of 5 mV/s. The ionic liquid enables a larger operating voltage range of 0.0-2.5 V compared to 0.0-1 V in aqueous medium. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD,ENGLAND
Keywords: Graphene; Nitrogenated graphene; Borocarbonitrides; Supercapacitors
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Id for Latest eprints
Date Deposited: 17 Feb 2014 11:01
Last Modified: 17 Feb 2014 11:01
URI: http://eprints.iisc.ac.in/id/eprint/48388

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