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Graphene films of controllable thickness as binder-free electrodes for high performance supercapacitors.
- Source :
-
Electrochimica Acta . Jun2014, Vol. 130, p791-799. 9p. - Publication Year :
- 2014
-
Abstract
- Abstract: Graphene films (G films) were obtained by direct vacuum filtration of a highly dispersed graphene suspension (G suspension) on filter paper. After the complete removal of the filter paper, the stand-alone G films were directly used as electrodes for supercapacitors, without any binder or electrochemical active additives. The thicknesses of the G films were controlled by varying the volume of filtrated G suspension. The stable G suspension was prepared by chemically reducing the graphite oxide together with the aryl diazonium salt solution. A small amount of charged sulphonate groups introduced by this process can effectively prevent the graphene nanosheets from aggregating during reduction. It was found that the best performing thin G film exhibited a high capacitance of 117.9 F/g at a high scan rate of 1000mV/s, with no deterioration observed after 15,000 cycles at this scan rate, and its energy density reached 16.38 Wh/Kg when the highest power density was 58.97 KW/Kg at the high scan rate. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 130
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 95931688
- Full Text :
- https://doi.org/10.1016/j.electacta.2014.03.077