A Comparison of Exfoliation Methods on Microstructure and Electrochemical Performance of Graphene Nanosheets for Supercapacitors

A Comparison of Exfoliation Methods on Microstructure and Electrochemical Performance of Graphene Nanosheets for Supercapacitors

Xinlu LiHongfang Song Hao Wang Hongyi Li Yuxin Zhang Jiamu Huang 

College of Materials Science and Engineering, Chongqing University, Chongqing, 400030, P. R. China

Corresponding Author Email: 
27 October 2011
7 December 2011
31 January 2012
| Citation

Graphene nanosheets (GNS) were exfoliated by thermal expansion and microwave irradiation, respectively. The influence of exfoliation methods on GNS’s surface structure and electrochemical property were analyzed. The porosity structure of GNS was measured by N2 adsorption. The N2adsorption results proved that both the specific surface area and pore volume of the GNS exfoliated by thermal expansion are larger than those by microwave irradiation. And the surface morphology was observed by scanning electron microscopy and transmission electron microscopy. The electrochemical performance of the graphene nanosheets were comparatively tested by cyclic voltammetry and galvanostatic discharge-charge tests. The GNS via thermal expansion exhibited better electrochemical property with the specific capacity of 188 F/g at the current density of 0.1 A/g.


graphene nanosheets, supercapacitor, thermal expansion, microwave irradiation

1. Introduction
2. Experimental
3. Results and Discussion
4. Conclusions

We are grateful for the financial support from Project No.CDJZR10 13 88 01 & No.CDJXS10 13 11 58 of the Fundamental Research Funds for the Central Universities and for the

Natural Science Foundation of China (No.51172293).


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