Issue 57, 2015

A high performance supercapacitor based on a ceria/graphene nanocomposite synthesized by a facile sonochemical method

Abstract

In this work, we have developed a novel nanocomposite material of ceria (CeO2)–reduced graphene oxide (RGO) by a sonochemical route for application as a symmetric supercapacitor. CeO2 nanoparticles have been anchored on RGO sheets in order to maximize the specific capacitances of these materials. Nanostructure studies and electrochemical performances of the CeO2 nanoparticles on the RGO sheets were systematically investigated. The morphology and crystalline structure of the nanocomposites were examined by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FT-IR), and X-ray diffraction (XRD). The electrochemical properties of the nanocomposite electrodes were examined by cyclic voltammetry (CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS) measurements. The CeO2–RGO nanocomposite electrodes exhibited excellent supercapacitive behavior with a high specific capacitance of (211 F g−1 at 2 mV s−1 and 185 F g−1 at 2.0 A g−1), high rate capability and good reversibility. The cycling stability of the electrode was measured by a continuous cyclic voltammetry (CCV) technique. Upon 4000 cycles, the specific capacitance of the electrode increases and reaches a maximum value of 105.6% of the initial value.

Graphical abstract: A high performance supercapacitor based on a ceria/graphene nanocomposite synthesized by a facile sonochemical method

Article information

Article type
Paper
Submitted
16 Feb 2015
Accepted
13 May 2015
First published
14 May 2015

RSC Adv., 2015,5, 46050-46058

Author version available

A high performance supercapacitor based on a ceria/graphene nanocomposite synthesized by a facile sonochemical method

A. S. Dezfuli, M. R. Ganjali, H. R. Naderi and P. Norouzi, RSC Adv., 2015, 5, 46050 DOI: 10.1039/C5RA02957K

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