Growth of anatase and rutile TiO2@Sb: SnO2 heterostructures and their application in photoelectrochemical water splitting

Sangbaek Park, Chan Woo Lee, In Sun Cho, Sanghyeon Kim, Jong Hun Park, Hae Jin Kim, Dong-Wan Kim, Sangwook Lee, Kug Sun Hong

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9 Citations (Scopus)

Abstract

We report three-dimensional (3D) nanostructures based on shape- and phase-controlled TiO2 coated transparent conducting oxide (TCO) nanowire array. Core-shell and branched nanostructures were obtained using an aqueous chemical bath deposition (CBD) method at room temperature. Adjusting the pH of a TiCl4 solution is a key factor that determines the morphology of the nanostructure. Spherical TiO2 anatase covered a Sb-doped SnO2 (ATO) nanowire when pH was maintained at a high level. In contrast, branched nanostructures with TiO2 rutile nanorods were synthesized by keeping a TiCl4 solution going down to a low pH. Nanorods were grown epitaxially along the [001] direction on ATO nanowires. Morphological and structural analysis indicates that phases and shapes of the 3D hybrid nanostructure are determined by the pH of the solution and the reaction time. A two-fold higher photoconversion efficiency of rutile TiO2 rod@ATO was obtained under simulated solar illumination compared to that of the anatase TiO2 nanoshell@ATO. These 3D hybrid nanostructures can offer (i) a large surface area and efficient charge transport in the TiO2 nanostructure, and (ii) an effective charge collection path through one-dimensional TCO, which is promising for various areas, including photoelectrochemical water splitting, as well as for application in electronic and photonic nanodevices.

Original languageEnglish
Pages (from-to)17508-17516
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number30
DOIs
Publication statusPublished - 2013 Jan 1
Externally publishedYes

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ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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