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Reduced graphene oxide aerogel with high-rate supercapacitive performance in aqueous electrolytes

Weijiang Si1, Xiaozhong Wu1, Jin Zhou1, Feifei Guo1, Shuping Zhuo1*, Hongyou Cui1 and Wei Xing2*

Author affiliations

1 School of Chemical Engineering, Shandong University of Technology, Zibo 255049, People’s Republic of China

2 School of Science, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, People’s Republic of China

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Citation and License

Nanoscale Research Letters 2013, 8:247  doi:10.1186/1556-276X-8-247

Published: 21 May 2013

Abstract

Reduced graphene oxide aerogel (RGOA) is synthesized successfully through a simultaneous self-assembly and reduction process using hypophosphorous acid and I2 as reductant. Nitrogen sorption analysis shows that the Brunauer-Emmett-Teller surface area of RGOA could reach as high as 830 m2 g−1, which is the largest value ever reported for graphene-based aerogels obtained through the simultaneous self-assembly and reduction strategy. The as-prepared RGOA is characterized by a variety of means such as scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy. Electrochemical tests show that RGOA exhibits a high-rate supercapacitive performance in aqueous electrolytes. The specific capacitance of RGOA is calculated to be 211.8 and 278.6 F g−1 in KOH and H2SO4 electrolytes, respectively. The perfect supercapacitive performance of RGOA is ascribed to its three-dimensional structure and the existence of oxygen-containing groups.

Keywords:
Supercapacitor; Reduced graphene oxide aerogel; Current density; Cyclic voltammetry