Novel carbon-doped TiO 2 nanotube arrays with high aspect ratios for efficient solar water splitting

Jong Hyeok Park, Sungwook Kim, Allen J. Bard

Research output: Contribution to journalArticlepeer-review

1723 Citations (Scopus)


The photocatalytic splitting of water into hydrogen and oxygen using solar light is a potentially clean and renewable source for hydrogen fuel. 1,2 There has been extensive investigation into metal-oxide semiconductors such as TiO 2, WO 3, and Fe 2O 3, which can be used as photoanodes in thin-film form. 3-5 Of the materials being developed for photoanodes, TiO 2 remains one of the most promising because of its low cost, chemical inertness, and photostability. 6 However, the widespread technological use of TiO 2 is hindered by its low utilization of solar energy in the visible region. In this study, we report the preparation of vertically grown carbon-doped TiO 2 (TiO 2-xC x) nanotube arrays with high aspect ratios for maximizing the photocleavage of water under white-light irradiation. The synthesized TiO 2-xC x nanotube arrays showed much higher photocurrent densities and more efficient water splitting under visible-light illumination (> 420 nm) than pure TiO 2 nanotube arrays. The total photocurrent was more than 20 times higher than that with a P-25 nanoparticulate film under white-light illumination.

Original languageEnglish
Pages (from-to)24-28
Number of pages5
JournalNano letters
Issue number1
Publication statusPublished - 2006 Jan

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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