20August2019

Nano-Micro Letters

The Effect of Thermal Exfoliation Temperature on the Structure and Supercapacitive Performance of Graphene Nanosheets

Haiyang Xian1, Tongjiang Peng1,*, Hongjuan Sun1, Jiande Wang1, 2

Abstract
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Nano-Micro Letters, , Volume 7, Issue 1, pp 17-26

First Online: October 31, 2014 (Article)

DOI:10.1007/s40820-014-0014-4

 

Abstract

 


a The first galvanostatic charge/discharge cycling curves for XHGS-n at a current density of 0.5A g−1, b galvanostatic charge/discharge cycling curves for XHGS-673 at various current density from 0.5A g−1 to 5.0A g−1, c the specific capacitances of XHGS-n electrodes at various current density from 0.5 A g−1 to 5.0 A g−1 and d capacitance curves of XHGS-673 under a current density of 0.5 A g−1, the inset of (d) shows the comparison of galvanostatic charge/discharge curves between 1st and 601st cycles for XHGS-673.

Graphene nanosheets were prepared from graphite oxide by thermal exfoliation method. The effect of thermal exfoliation temperature on the structure and supercapacitive performance of graphene nanosheets has been investigated. The results show that the graphene nanosheets with pore sizes center around 4.0 nm .With an increase of thermal reduction temperature, the number of stacking layers and the structure disorder degree increase, while the oxygen-containing groups content, BET surface area and electrical resistivity of graphene nanosheets decrease. The results indicate that 673K is the preferable thermal exfoliation temperature to acquire good supercapacitive performance. In this case, the graphene nanosheets have the best supercapacitive performance (233.1 F g-1) in a 6 mol L-1 KOH electrolyte. The prepared graphene nanosheets at the preferable thermal exfoliation temperature have good rate performance and cycle stability.

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