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 journalArticle

1493 Citations (Scopus)

Abstract

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
Volume6
Issue number1
DOIs
Publication statusPublished - 2006 Jan 1

Fingerprint

water splitting
high aspect ratio
Nanotubes
Aspect ratio
nanotubes
Carbon
Water
carbon
Photocurrents
photocurrents
Lighting
illumination
hydrogen fuels
Hydrogen fuels
solar energy
metal oxide semiconductors
Solar energy
water
Hydrogen
Metals

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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abstract = "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.",
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Novel carbon-doped TiO 2 nanotube arrays with high aspect ratios for efficient solar water splitting. / Park, Jong Hyeok; Kim, Sungwook; Bard, Allen J.

In: Nano letters, Vol. 6, No. 1, 01.01.2006, p. 24-28.

Research output: Contribution to journalArticle

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