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Photocatalytic Production of H_2 on Nanocomposite Catalysts

Ryu, Su Young and Choi, Jina and Balcerski, William and Lee, Tai Kyu and Hoffmann, Michael R. (2007) Photocatalytic Production of H_2 on Nanocomposite Catalysts. Industrial & Engineering Chemistry Research, 46 (23). pp. 7476-7488. ISSN 0888-5885.

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The photocatalytic production of H_2 in water with visible light using nanocomposite catalysts, which include quantum-sized (Q-sized) CdS, CdS nanoparticles embedded in zeolite cavities (CdS/zeolite), and CdS quantum dots (Q-CdS) deposited on KNbO_3 (CdS/KNbO_3 and Ni/NiO/KNbO_3/CdS), is investigated. The rate of H_2 production in alcohol/water mixtures and other electron donors at λ ≥ 400 nm is the highest with the hybrid catalyst, Ni/NiO/KNbO_3/CdS with a measured quantum yield, φ, of 8.8%. The relative order of reactivity as a function of catalyst is Ni(0)/NiO/KNbO_3/CdS > Ni(0)/KNbO_3/CdS > KNbO_3/CdS > CdS/NaY-zeolite > CdS/TiY-zeolite > CdS, while the reactivity order with respect to the array of electron donors is 2-propanol > ethanol > methanol > sulfite > sulfide. In addition, the rates of H_2 production from water and water−alcohol mixtures are correlated with fluorescent emission spectra and fluorescence lifetimes. Irradiation of Ni/NiO/KNbO_3/CdS proceeds via the partial reduction of Cd(II) to Cd(0) on the surface of CdS. The coupling of Ni(0)/NiO and Cd(0) on the surface of KNbO_3 appears to have some of the chemical principles of a Ni/Cd battery at high overvoltages. Evidence for the formation of nickel hydride as an important intermediate has been obtained.

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Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 2007 American Chemical Society. Received for review February 28, 2007. Revised manuscript received May 1, 2007. Accepted May 3, 2007. Publication Date (Web): June 26, 2007. We are grateful to the Hydrogen Energy R&D Center of the 21st Century Frontier Research and Development Program of the Ministry of Science and Technology of Korea for financial support. Additional support was provided graciously by the Fellowship Program of the Korean Science & Engineering Foundation (KOSEF) and the Davidow Research Fund of the California Institute of Technology.
Funding AgencyGrant Number
Ministry of Science and Technology (Korea)UNSPECIFIED
Korean Science & Engineering Foundation (KOSEF)UNSPECIFIED
Caltech Davidow Research FundUNSPECIFIED
Issue or Number:23
Record Number:CaltechAUTHORS:20150806-062659639
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Official Citation:Photocatalytic Production of H2 on Nanocomposite Catalysts Su Young Ryu, Jina Choi, William Balcerski, Tai Kyu Lee, and Michael R. Hoffmann Industrial & Engineering Chemistry Research 2007 46 (23), 7476-7488 DOI: 10.1021/ie0703033
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59256
Deposited By: Ruth Sustaita
Deposited On:06 Aug 2015 21:19
Last Modified:03 Mar 2020 13:01

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