Synthesis and electrochemical properties of CeO2 nanoparticle modified TiO2 nanotube arrays

✍ Scribed by Hao Wen; Zhifu Liu; Qunbao Yang; Yongxiang Li; Jerry Yu

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 937 KB
• Volume: 56
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2010.12.085

✦ Synopsis

In this paper, a cerium dioxide (CeO 2 ) modified titanium dioxide (TiO 2 ) nanotube array film was fabricated by electrodeposition of CeO 2 nanoparticles onto an anodized TiO 2 nanotube array. The structural investigation by X-ray diffraction, scanning electron microscopy and transmission electron microscopy indicated that the CeO 2 nanoparticles grew uniformly on the walls of the TiO 2 nanotubes. The composite was composed of cubic-phase CeO 2 crystallites and anatase-phase TiO 2 after annealing at 450 • C. The cyclic voltammetry and chronoamperometric charge/discharge measurement results indicated that the CeO 2 modification obviously increased the charge storage capacity of the TiO 2 nanotubes. The charge transfer process at the surface, that is, the pseudocapacitance, was the dominate mechanism of the charge storage in CeO 2 -modified TiO 2 nanotubes. The greater number of surface active sites resulting from uniform application of the CeO 2 nanoparticles to the well-aligned TiO 2 nanotubes contributed to the enhancement of the charge storage density.