Enhanced charge storage by the electrocatalytic effect of anodic TiO2nanotubes

Guoge Zhang, Chuanjun Huang, Li Min Zhou, Lin Ye, Wenfang Li, Haitao Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

31 Citations (Scopus)

Abstract

Ordered titania nanotube (TNT) arrays were fabricated by anodization of titanium with a very fast voltage ramp speed. Co(OH)2/TNT nanocomposite was synthesized by cathodic deposition using the as-anodized TNT as the substrate. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) were used to characterize the morphology, crystalline structure and chemical state. The capacitive characteristics were investigated by cyclic voltammetry (CV), charge-discharge tests, and electrochemical impedance spectroscopy (EIS). Thanks to the electrocatalytic effect of the as-anodized TNTs on the reduction of Co(OH)2, the Co(OH)2/TNT composite electrode exhibits a significantly enhanced charge storage capacity (an increase of 73%) when compared with Co(OH)2/Ti (titanium as the deposition substrate). The occurrence of such an electrocatalytic effect is suggested to be related to the nano-sized TiO2crystals (rutile) embedded in organized amorphous TNTs. Co(OH)2/TNT demonstrates enhanced specific energy, high rate capability and good cyclability, and can be a potential electrode of choice for supercapacitors.
Original languageEnglish
Pages (from-to)4174-4181
Number of pages8
JournalNanoscale
Volume3
Issue number10
DOIs
Publication statusPublished - 1 Oct 2011

ASJC Scopus subject areas

  • Materials Science(all)

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