Impact of alkoxy chain length on carbazole-based, visible light-driven, dye sensitized photocatalytic hydrogen production

Motonori Watanabe, Hidehisa Hagiwara, Yudai Ogata, Aleksandar Staykov, Sean R. Bishop, Nicola H. Perry, Yuan Jay Chang, Shintaro Ida, Keiji Tanaka, Tatsumi Ishihara

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Alkoxyphenyl-substituted carbazole-based metal-free organic dyes were synthesized and effectively used for dye-sensitized, visible-light-driven, photocatalytic hydrogen production. Photocatalytic hydrogen production was investigated using a TiO2/dye/Pt structure with triethanolamine as the sacrificial reagent. The dye-loaded TiO2 photocatalyst exhibited a high yield of hydrogen production when the length of the alkoxy chain was long enough to sufficiently improve the hydrophobicity at the interface between the dye-loaded TiO2 and the water medium. In the alkoxyphenyl-substituted carbazole dyes, the dye with the longest alkoxy chain (C22) exhibited the best hydrogen production performance, but it had a yield only slightly better than that of the dye with the second longest chain length (C16). The dye C22 displayed a turnover number (TON) of 3094 after 24 h of visible light irradiation (>420 nm). However, the compound with no hydrophobic substituent (C1), exhibited the lowest hydrogen production performance with a TON of 1497. Thus, a 207% increase in the hydrogen production yield was observed when hydrophobic substituents were present. Analysis of time-resolved absorption spectra, impedance spectra and incident photon conversion efficiency spectra revealed that the alkoxy chain has a hydrophobic effect at the interface between the dye-loaded TiO2 and the water. Specifically, the hydrophobicity of the dye improved the charge-recombination lifetime for electron injection from the dye into the TiO2 surface in the water for hydrogen production.

Original languageEnglish
Pages (from-to)21713-21721
Number of pages9
JournalJournal of Materials Chemistry A
Volume3
Issue number43
DOIs
Publication statusPublished - Jan 1 2015

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Hydrogen production
Chain length
Coloring Agents
Dyes
Hydrophobicity
carbazole
alkoxyl radical
Water
Triethanolamine
Electron injection
Photocatalysts
Conversion efficiency
Absorption spectra
Photons
Metals
Irradiation

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Impact of alkoxy chain length on carbazole-based, visible light-driven, dye sensitized photocatalytic hydrogen production. / Watanabe, Motonori; Hagiwara, Hidehisa; Ogata, Yudai; Staykov, Aleksandar; Bishop, Sean R.; Perry, Nicola H.; Chang, Yuan Jay; Ida, Shintaro; Tanaka, Keiji; Ishihara, Tatsumi.

In: Journal of Materials Chemistry A, Vol. 3, No. 43, 01.01.2015, p. 21713-21721.

Research output: Contribution to journalArticle

Watanabe, Motonori ; Hagiwara, Hidehisa ; Ogata, Yudai ; Staykov, Aleksandar ; Bishop, Sean R. ; Perry, Nicola H. ; Chang, Yuan Jay ; Ida, Shintaro ; Tanaka, Keiji ; Ishihara, Tatsumi. / Impact of alkoxy chain length on carbazole-based, visible light-driven, dye sensitized photocatalytic hydrogen production. In: Journal of Materials Chemistry A. 2015 ; Vol. 3, No. 43. pp. 21713-21721.
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