Photocatalytic Production of Hydrogen from Water with Visible Light Using Hybrid Catalysts of CdS Attached to Microporous and Mesoporous Silicas
Abstract
Microporous and mesoporous silicas are combined with nanoparticulate CdS particles to form hybrid photocatalysts that produce H_2 from water/ethanol solutions under visible light irradiation. Catalyst structures are characterized by XRD and SEM. All hybrid materials are active photocatalysts for water splitting, and the order of photoactivity is found to be zeolite-Y > SBA-15 > zeolite-L. Silica cavity size, which determines, in part, CdS particle size, and photocatalytic activity are found to be correlated. Photocatalytic activity is seen to decrease under acidic or basic conditions with associated negative ionic strength effects. In addition, XPS analysis indicates loss of ion-exchanged and Cd^(2+) ion from the silicate supports occurs during the course of the photochemical reaction in solution with the complete retention of preformed and surface-bound CdS.
Additional Information
© 2007 American Chemical Society. Received: June 21, 2007; In Final Form: August 10, 2007. Publication Date (Web): November 13, 2007. We are grateful to the Hydrogen Energy Research & Development Center and 21st Century Frontier Research and Development Program of the Ministry of Science and Technology of Korea for research support.Additional details
- Eprint ID
- 59253
- Resolver ID
- CaltechAUTHORS:20150806-062658852
- Ministry of Science and Technology (Korea)
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2015-08-06Created from EPrint's datestamp field
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2021-11-10Created from EPrint's last_modified field