Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/33612
Title: Water-soluble graphene grafted by poly(sodium 4-styrenesulfonate) for enhancement of electric capacitance
Authors: Du, FP
Wang, JJ
Tang, CY 
Tsui, CP 
Zhou, XP
Xie, XL
Liao, YG
Issue Date: 2012
Publisher: Institute of Physics Publishing
Source: Nanotechnology, 2012, v. 23, no. 47, 475704 How to cite?
Journal: Nanotechnology 
Abstract: Water-soluble poly(sodium 4-styrenesulfonate) modified graphene (PSSS-GR) was successfully synthesized via covalently grafting poly(sodium 4-styrenesulfonate) (PSSS) on the surfaces of graphene (GR) nanosheets. The structure of PSSS-GR was investigated with Fourier transform infrared, x-ray photoelectron and Raman spectroscopy, thermogravimetric analysis, transmission and scanning electron microscopy and atomic force microscopy. The PSSS chains made the GR nanosheets fully exfoliate into a single-layer structure, and the PSSS layer on GR reached 90wt%. PSSS chains displayed mutually repulsive effects on promoting GR sheets that were more stable in water. The performances of supercapacitors made of PSSS-GR and unmodified GR electrodes were compared using cyclic voltammetry and galvanostatic charge/discharge techniques. The results showed that PSSS is an effective binder for graphene sheets and can increase the specific capacitance of PSSS-GR based supercapacitors and improve their rate capability. The maximum specific capacitance of the PSSS-GR based supercapacitor was 210Fg 1 at 5Ag 1, which was 166% higher than for one made of unmodified graphene electrodes. Electrochemical impedance spectroscopy demonstrated fast ion diffusion in the PSSS-GR electrode structure. PSSS-GR based supercapacitors can fulfil one of the essential requirements for potential electric energy storage applications.
URI: http://hdl.handle.net/10397/33612
ISSN: 0957-4484
EISSN: 1361-6528
DOI: 10.1088/0957-4484/23/47/475704
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