Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 5, Issue 4, Pages 6391-6399Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1ee02478g
Keywords
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Funding
- Singapore Ministry of Education [MOE2008-T2-1-004]
- ARC
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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 NaBH4. The present reduction method holds great promise for mass production of soluble graphene-based materials for electrochemical energy storage.
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