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Received January 18, 2011
Accepted February 21, 2011
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Effect of CdS contents on H2 production from Pt-(CdS/TiO2) film-typed photocatalysts
Department of Chemical Engineering, University of Seoul, 90 Jeonnong-dong, Dongdaemun-gu, Seoul 130-743, Korea
jhkimad@uos.ac.kr
Korean Journal of Chemical Engineering, August 2011, 28(8), 1684-1687(4), 10.1007/s11814-011-0045-1
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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_x000D_
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_x000D_
of evolved hydrogen are 5.407 μmol/cm2 ·h at this photocatalyst formulation.
Keywords
References
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