CaltechAUTHORS
  A Caltech Library Service

Effects of the preparation method of the ternary CdS/TiO_2/Pt hybrid photocatalysts on visible light-induced hydrogen production

Park, Hyunwoong and Choi, Wonyong and Hoffmann, Michael R. (2008) Effects of the preparation method of the ternary CdS/TiO_2/Pt hybrid photocatalysts on visible light-induced hydrogen production. Journal of Materials Chemistry, 18 (20). pp. 2379-2385. ISSN 0959-9428. https://resolver.caltech.edu/CaltechAUTHORS:PARjmc08

[img]
Preview
PDF - Published Version
See Usage Policy.

859Kb
[img]
Preview
Cover Image
See Usage Policy.

17Kb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:PARjmc08

Abstract

A variety of combinations of CdS, TiO2, and Pt in preparing the hybrid catalysts were studied for hydrogen production under visible light ( > 420 nm) irradiation. The preparation method sensitively influenced the activity of the ternary hybrid catalysts. The formation of the potential gradient at the interface between CdS and TiO2 is necessary in achieving the efficient charge separation and transfer and how the platinum as a cocatalyst is loaded onto the CdS/TiO2 hybrid catalysts determines the overall hydrogen production efficiency. The common method of photoplatinization of CdS/TiO2 hybrid [Pt-(CdS/TiO2)] was much less efficient than the present method in which Pt was photodeposited on bare TiO2, which was followed by the deposition of CdS [CdS/(Pt-TiO2)]. The CdS/(Pt-TiO2) has the hydrogen production rate ranging (6–9) × 10-3 mol h-1 g-1, which is higher by a factor of 3–30 than that of Pt-(CdS/TiO2). The photocatalytic activity of the ternary hybrid catalysts was extremely sensitive to where the platinum is loaded. The photoactivity of the hybrid catalyst was also assessed in terms of the photocurrent collected by the methyl viologen electron shuttle in the catalyst suspension. CdS/(Pt-TiO2) generated higher photocurrents than Pt-(CdS/TiO2) by a factor of 2–7. The extreme sensitivity of the preparation method to the hydrogen production activity should be taken into account when hybrid photocatalysts are designed and prepared.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1039/b718759aDOIUNSPECIFIED
ORCID:
AuthorORCID
Park, Hyunwoong0000-0002-4938-6907
Hoffmann, Michael R.0000-0001-6495-1946
Alternate Title:Effects of the preparation method of the ternary CdS/TiO2/Pt hybrid photocatalysts on visible light-induced hydrogen production
Additional Information:This journal is © The Royal Society of Chemistry 2008. Received 4th December 2007, Accepted 18th February 2008. First published on the web 14th March 2008. This work was supported by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2005-214-D00259). This paper is part of a Journal of Materials Chemistry theme issue on hydrogen storage and generation. Guest editor: John Irvine.
Funders:
Funding AgencyGrant Number
Korea Research Foundation (KRF)KRF-2005-214-D00259
Subject Keywords:CADMIUM-SULFIDE PHOTOCATALYSTS; COMPLEX-SENSITIZED TIO2; ELECTRON-TRANSFER; SEMICONDUCTOR PHOTOCATALYSTS; CDS NANOPARTICLES; AQUEOUS-SOLUTIONS; SUSPENSIONS; WATER; PARTICLES; MECHANISM
Issue or Number:20
Record Number:CaltechAUTHORS:PARjmc08
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:PARjmc08
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10951
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:20 Jun 2008
Last Modified:09 Mar 2020 13:19

Repository Staff Only: item control page