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Journal of Nanomaterials
Volume 2014, Article ID 597974, 8 pages
http://dx.doi.org/10.1155/2014/597974
Research Article

Ionic Liquid-Assisted Synthesis of a NiO/CNTs Composite and Its Electrochemical Capacitance

1Xinjiang Institute of Ecology & Geography, Chinese Academy of Sciences, Urumqi 830011, China
2Electronic Components Testing Center, The Fifth Electronics Research Institute of Ministry of Industry & Information Technology, Guangzhou 510610, China
3Key Laboratory of Functional Materials & Devices under Special Environments, Xinjiang Key Laboratory of Electronic Information Materials & Devices, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China

Received 30 September 2014; Revised 1 December 2014; Accepted 1 December 2014; Published 25 December 2014

Academic Editor: Alan K. T. Lau

Copyright © 2014 Yitong Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A novel solid-state method has been developed for synthesizing nickel oxide (NiO)/carbon nanotubes (CNTs) composite using an ionic liquid (IL, 1-butyl-3-methylimidazolium chloride) as the reaction medium. Ultraviolet-visible (UV-vis) absorbance spectroscopy, infrared spectroscopy (IR), and scanning electron microscopy (SEM) were employed to investigate the structure, morphology, and formation mechanism of the synthesized sample. The results demonstrated that the IL is effective for dispersing CNTs, which allows the tethering of nickel (II) ions onto the surfaces of the CNTs and facilitates the subsequent chemical deposition of NiO to obtain the NiO/CNTs composite. The electrochemical properties of the composite were determined using cyclic voltammetry and galvanostatic charge/discharge measurements in 6 M KOH. Because of its unique structure, the prepared NiO/CNTs electrode exhibited good capacitive behavior and cyclability. The high specific capacitance (521 F g−1) and good rate capability (91% capacity retention at 0.5 A g−1) of the NiO/CNTs composite enable its use as a practical supercapacitor electrode material.