Characterization of iridium dioxide–carbon nanotube nanocomposites grown onto graphene for supercapacitor

[Display omitted] •Graphene was fabricated simply on Cu foil using mobile thermal chemical vapor deposition system.•The synthesized graphene was employed as a substrate for CNT growth.•With photolithography, CNTs improved the specific surface area and electrochemical stability.•IrO2 nanofoils with p...

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Bibliographic Details
Published in:Journal of alloys and compounds 2015-01, Vol.619, p.131-137
Main Authors: Shih, Yi-Ting, Lee, Kuei-Yi, Huang, Ying-Sheng
Format: Article
Language:English
Subjects:
Capacitance
Carbon nanotube
Durability
Electrochemical analysis
Electrodes
Graphene
Honeycomb
Honeycomb construction
Iridium dioxide
Nanostructure
Supercapacitor
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Summary:[Display omitted] •Graphene was fabricated simply on Cu foil using mobile thermal chemical vapor deposition system.•The synthesized graphene was employed as a substrate for CNT growth.•With photolithography, CNTs improved the specific surface area and electrochemical stability.•IrO2 nanofoils with pseudocapacitive property were coated onto CNTs to increase the capacitance. Carbon nanotubes (CNTs) with a honeycomb arrangement were designed onto graphene as the electrochemical electrodes. The honeycomb arrangement provided a relatively larger surface area to store more ions with a stronger structure to maintain long-term surface morphology. The combination of CNTs and graphene exhibited robust durability during electrochemical performance. The pseudo-capacitive property of IrO2 was coated onto the CNT surface to enhance the capacitance. Cyclic voltammetry and charging–discharging measurements were used to examine the electrochemical behaviors. The CNTs/graphene and IrO2/CNTs/graphene capacitances were 3.93 and 129.40F/g, respectively. The designed electrode demonstrates excellent characteristics and is appropriate for electrochemical applications.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2014.08.210