Fabrication of reduced graphene oxide/TiO sub(2) nanorod/reduced graphene oxide hybrid nanostructures as electrode materials for supercapacitor applications

Two-dimensional (2D) reduced graphene oxide/titanium dioxide nanorod array/reduced graphene oxide (rGO/TiO sub(2) NR/rGO) with a porous hybrid structure was fabricated as an electrode material for use in electrochemical supercapacitors. The structural, morphological, and compositional characteristic...

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Bibliographic Details
Published in:CrystEngComm 2013-11, Vol.15 (47), p.10222-10229
Main Authors: Ramadoss, Ananthakumar, Kim, Gui-Shik, Kim, Sang Jae
Format: Article
Language:English
Subjects:
Capacitors
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Summary:Two-dimensional (2D) reduced graphene oxide/titanium dioxide nanorod array/reduced graphene oxide (rGO/TiO sub(2) NR/rGO) with a porous hybrid structure was fabricated as an electrode material for use in electrochemical supercapacitors. The structural, morphological, and compositional characteristics of the resulting electrode material were evaluated by using X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FE-SEM), and X-ray photoelectron spectroscopy (XPS). The electrochemical behavior of the as-prepared electrodes was characterized by using cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) in 1 M Na sub(2)SO sub(4) aqueous electrolyte. The maximum specific capacitance of this rGO/TiO sub(2) NR/rGO electrode was 114.5 F g super(-1) at a scan rate of 5 mV s super(-1). The electrode exhibited high cycling stability, retaining over 85% of its initial capacitance after 4000 cycles. These results indicate that rGO/TiO sub(2)/rGO is a promising candidate for the electrode material in supercapacitor applications.
ISSN:1466-8033
DOI:10.1039/c3ce41517a