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.

PDF Sol_Sta_Com_175_43_2013.pdf - Published Version Restricted to Registered users only Download (4MB) | Request a copy

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
Publication:	SOLID STATE COMMUNICATIONS
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
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
Date Deposited:	17 Feb 2014 11:01
Last Modified:	17 Feb 2014 11:01
URI:	http://eprints.iisc.ac.in/id/eprint/48388

Actions (login required)

View Item