The electrocapacitive properties of graphene oxide reduced by urea
The electrocapacitive properties of graphene oxide reduced by urea
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DOI：
10.1039/c1ee02478g
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发表时间：
2012-04-01
影响因子：
32.5
通讯作者：
Zhao, X. S.
中科院分区：
文献类型：
--
作者：
Lei, Zhibin;Lu, Li;Zhao, X. S.
本文报道了一种以尿素为还原剂的简便绿色还原氧化石墨的方法。UV-Vis， XRD和XPS结果表明，尿素是一种有效的还原剂，可以去除氧化石墨中的含氧基团，恢复石墨烯的共轭电子结构。将得到的还原氧化石墨烯作为超级电容器电极进行了测试。在0.5 A g（-1）和30 A g（-1）电流密度下，分别观察到255和100 F g（-1）的重量电容。还原后的氧化石墨烯纸的体积电容为196 F cm(3)。经过1200次连续的恒流充放电循环后，电极保持了93%的电容。尿素还原氧化石墨烯的电容性能优于之前报道的大多数由联氨或NaBH4还原的石墨烯基电极材料。目前的还原方法为大规模生产可溶石墨烯基电化学储能材料提供了广阔的前景。
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.