Photocatalytic hydrogen evolution on dye-sensitized mesoporous carbon nitride photocatalyst with magnesium phthalocyanine

Kazuhiro Takanabe, Kumiko Kamata, Xinchen Wang, Markus Antonietti, Jun Kubota, Kazunari Domen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

274 Scopus citations

Abstract

Spectral sensitization of a mesoporous graphite carbon nitride (mpg-C 3N4) photocatalyst was investigated by depositing magnesium phthalocyanine (MgPc) to expand the absorption to wavelengths longer than those of the principal mpg-C3N4. The obtained sample, MgPc/Pt/mpg-C3N4 (Pt as a cocatalyst) showed stable photocatalytic evolution of hydrogen from aqueous solution in the presence of sacrificial reagents (triethanolamine), even under irradiation at wavelengths longer than 600 nm. Increasing the amount of MgPc led to ordered MgPc aggregation on the photocatalyst surfaces. The rate of photocatalytic hydrogen evolution was highest on a sample with an amount of MgPc corresponding to a monolayer on the Pt/mpg-C3N4 photocatalyst surface. The obtained action spectra of hydrogen evolution and the observation that the amount of evolved hydrogen substantially surpassed the amount of MgPc, confirm that the introduced MgPc functioned as a photocatalytic sensitizer.

Original languageEnglish (US)
Pages (from-to)13020-13025
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume12
Issue number40
DOIs
StatePublished - Oct 28 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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