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Issue 4, 2012
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The electrocapacitive properties of graphene oxide reduced by urea

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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 NaBH4. The present reduction method holds great promise for mass production of soluble graphene-based materials for electrochemical energy storage.

Graphical abstract: The electrocapacitive properties of graphene oxide reduced by urea

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Publication details

The article was received on 26 Aug 2011, accepted on 10 Oct 2011 and first published on 03 Nov 2011


Article type: Paper
DOI: 10.1039/C1EE02478G
Energy Environ. Sci., 2012,5, 6391-6399

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    The electrocapacitive properties of graphene oxide reduced by urea

    Z. Lei, L. Lu and X. S. Zhao, Energy Environ. Sci., 2012, 5, 6391
    DOI: 10.1039/C1EE02478G

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