Effect of CdS contents on H2 production from Pt-(CdS/TiO2) film-typed photocatalysts

Eunpyo Hong, Jin Hyun Kim, Sunhye Yu, Jung Hyeun Kim

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Pt-(CdS/TiO2) film-typed photocatalysts are prepared with a doctor-blade method followed by a chemical bath deposition (CBD) process, and the films are characterized by UV-vis spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy. The film-typed structure is composed of photocatalysts and Pt metal part on a FTO substrate without additional electric device, so it is relatively simpler than the conventional photoelectrochemical cell. CdS quantum dots are introduced as a sensitizer for visible light response. Amounts of CdS quantum dots on TiO2 surface are increased with increasing CBD cycles, but they start to aggregate after certain CdS concentration due to oversaturation phenomenon. This high CdS content induces high electron losses, and therefore it reduces amounts of hydrogen production. As a result, there is a saturation point of CdS content at Cd/Ti ratio of 0. 197, and the amounts of evolved hydrogen are 5. 407 μmol/cm2·h at this photocatalyst formulation.

Original languageEnglish
Pages (from-to)1684-1687
Number of pages4
JournalKorean Journal of Chemical Engineering
Volume28
Issue number8
DOIs
StatePublished - Aug 2011

Keywords

  • Cadmium Sulfide
  • Chemical Bath Deposition
  • Hydrogen Production
  • Photocatalyst
  • Titanium Dioxide

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