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Preparation of Ni Nanoparticles-TiO2 Nanotube Arrays Composite and Its Application for Electrochemical Capacitor

  • He, Huichao (College of Chemistry and Chemical Engineering, Chongqing University) ;
  • Zhang, Yunhuai (College of Chemistry and Chemical Engineering, Chongqing University) ;
  • Xiao, Peng (College of Physics, Chongqing University) ;
  • Yang, Yannan (Environmental Monitoring Station of Ziyang) ;
  • Lou, Qing (College of Physics, Chongqing University) ;
  • Yang, Fei (College of Chemistry and Chemical Engineering, Chongqing University)
  • Received : 2011.11.25
  • Accepted : 2012.02.11
  • Published : 2012.05.20

Abstract

Ni nanoparticles-$TiO_2$ nanotube arrays (Ni/$TiO_2NTs$) composites were prepared by pulsed electrodeposition method and subsequently characterized by means of field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). The FESEM results showed that highly dispersed Ni nanoparticles were not only loaded on the top of the $TiO_2NTs$ but also within the tubular structure, and the particle size of Ni prepared at different current amplitude (100, 200 and 300 $mA{\cdot}cm^{-2}$) was in the range of 15 to 70 nm. The electrochemical studies indicated that Ni nanoparticles loaded on the highly ordered $TiO_2NTs$ are readily accessible for electrochemical reactions, which improve the efficiency of the Ni nanoparticles and $TiO_2NTs$. A maximum specific capacitance (27.3 $mF.cm^{-2}$) was obtained on the Ni/$TiO_2NTs$ composite electrode that prepared at a current of 200 $mA.cm^{-2}$, and the electrode also exhibited excellent electrochemical stability.

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