Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/43812
Title: Electrochemically reduced graphene oxide/carbon nanotubes composites as binder-free supercapacitor electrodes
Authors: Yang, Q
Pang, SK
Yung, KC 
Keywords: Binder-free electrodes
Electrochemical reduction
Graphene oxide
Multiwalled carbon nanotubes
Reduced graphene oxide
Supercapacitors
Issue Date: 2016
Publisher: Elsevier
Source: Journal of power sources, 2016, v. 311, p. 144-152 How to cite?
Journal: Journal of power sources 
Abstract: Binder-free composites of electrochemically reduced graphene oxide (ecrGO) and multiwalled carbon nanotubes (MWCNTs) were fabricated as supercapacitors electrodes operating in aqueous systems. GO was found to be electrochemically reduced according to the XRD and Raman data. Therefore, this facile and controllable method was applied to reduce GO in the GO/MWCNTs composites, generating ecrGO/MWCNTs composites. The ecrGO/MWCNTs composites exhibit higher specific capacitance (Csp) than ecrGO because the intercalation of MWCNTs into ecrGO sheets increases the surface areas, according to the TEM, XRD and N2 adsorption-desorption results. The composites with different mass ratios of GO to MWCNTs (10:1, 5:1, 1:1, 1:5, 1:10) were investigated. The ecrGO/MWCNTs composite (GO: MWCNTs = 5:1) showed the highest Csp from the cyclic voltammetry results at a scan rate of 10 mV s-1, and it expressed Csp of 165 F g-1 at a current density of 1 A g-1 and 93% retention after 4000 cycles of charge/discharge. When the mass ratio of GO to MWCNTs further decreases to 1:10, the Csp of the composites declines, and the ecrGO/MWCNTs composite (GO: MWCNTs = 1:10) performs a nearly pure double-layer capacitor. However, the composites containing more MWCNTs can maintain better capacitive behavior at higher rates of charge/discharge.
URI: http://hdl.handle.net/10397/43812
ISSN: 0378-7753
EISSN: 1873-2755
DOI: 10.1016/j.jpowsour.2016.02.016
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