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Title: The electrocapacitive properties of graphene oxide reduced by urea
Authors: Lei, Z. 
Lu, L. 
Zhao, X.S.
Issue Date: Apr-2012
Citation: Lei, Z., Lu, L., Zhao, X.S. (2012-04). The electrocapacitive properties of graphene oxide reduced by urea. Energy and Environmental Science 5 (4) : 6391-6399. ScholarBank@NUS Repository.
Abstract: We report a facile and green route to reduce graphite oxide using urea as the reducing agent. UV-Vis, XRD and XPS results revealed that urea was an effective reducing agent in removing oxygen-containing groups from graphite oxide for restoring the conjugated electronic structure of graphene. The obtained reduced graphene oxide was tested as supercapacitor electrode. Gravimetric capacitances of 255 and 100 F g -1 at current densities of 0.5 and 30 A g -1, respectively, were observed. The reduced graphene oxide paper showed a volumetric capacitance of 196 F cm -3. After 1200 continuous cycles of galvanostatic charge-discharge, the electrode retained 93% of its capacitance. The electrocapacitive performance of the urea-reduced graphene oxide outperformed most of the previously reported graphene-based electrode materials, which were reduced by hydrazine or NaBH 4. The present reduction method holds great promise for mass production of soluble graphene-based materials for electrochemical energy storage. This journal is © 2012 The Royal Society of Chemistry.
Source Title: Energy and Environmental Science
ISSN: 17545692
DOI: 10.1039/c1ee02478g
Appears in Collections:Staff Publications

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