Highly n-Type Titanium Oxide as an Electronically Active Support for Platinum in the Catalytic Oxidation of Carbon Monoxide

Handle URI:
http://hdl.handle.net/10754/598506
Title:
Highly n-Type Titanium Oxide as an Electronically Active Support for Platinum in the Catalytic Oxidation of Carbon Monoxide
Authors:
Baker, L. Robert; Hervier, Antoine; Seo, Hyungtak; Kennedy, Griffin; Komvopoulos, Kyriakos; Somorjai, Gabor A.
Abstract:
The role of the oxide-metal interface in determining the activity and selectivity of chemical reactions catalyzed by metal particles on an oxide support is an important topic in science and industry. A proposed mechanism for this strong metal-support interaction is electronic activation of surface adsorbates by charge carriers. Motivated by the goal of using electronic activation to drive nonthermal chemistry, we investigated the ability of the oxide support to mediate charge transfer. We report an approximately 2-fold increase in the turnover rate of catalytic carbon monoxide oxidation on platinum nanoparticles supported on stoichiometric titanium dioxide (TiO2) when the TiO2 is made highly n-type by fluorine (F) doping. However, for nonstoichiometric titanium oxide (TiOX<2) the effect of F on the turnover rate is negligible. Studies of the titanium oxide electronic structure show that the energy of free electrons in the oxide determines the rate of reaction. These results suggest that highly n-type TiO2 electronically activates adsorbed oxygen (O) by electron spillover to form an active O- intermediate. © 2011 American Chemical Society.
Citation:
Baker LR, Hervier A, Seo H, Kennedy G, Komvopoulos K, et al. (2011) Highly n-Type Titanium Oxide as an Electronically Active Support for Platinum in the Catalytic Oxidation of Carbon Monoxide. The Journal of Physical Chemistry C 115: 16006–16011. Available: http://dx.doi.org/10.1021/jp203151y.
Publisher:
American Chemical Society (ACS)
Journal:
The Journal of Physical Chemistry C
Issue Date:
18-Aug-2011
DOI:
10.1021/jp203151y
Type:
Article
ISSN:
1932-7447; 1932-7455
Sponsors:
Deposition and processing of titanium oxide films took place in the Marvell Nanolab at the University of California, Berkeley (UCB). X-ray photoelectron spectroscopy and scattering electron microscopy took place in the Molecular Foundry at Lawrence Berkeley National Lab. This work was funded by the Helios Solar Energy Research Center and by the Chemical Sciences Division, which are supported by the Director, Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 and by the UCB-KAUST Academic Excellence Alliance (AEA) Program.
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Full metadata record

DC FieldValue Language
dc.contributor.authorBaker, L. Roberten
dc.contributor.authorHervier, Antoineen
dc.contributor.authorSeo, Hyungtaken
dc.contributor.authorKennedy, Griffinen
dc.contributor.authorKomvopoulos, Kyriakosen
dc.contributor.authorSomorjai, Gabor A.en
dc.date.accessioned2016-02-25T13:31:13Zen
dc.date.available2016-02-25T13:31:13Zen
dc.date.issued2011-08-18en
dc.identifier.citationBaker LR, Hervier A, Seo H, Kennedy G, Komvopoulos K, et al. (2011) Highly n-Type Titanium Oxide as an Electronically Active Support for Platinum in the Catalytic Oxidation of Carbon Monoxide. The Journal of Physical Chemistry C 115: 16006–16011. Available: http://dx.doi.org/10.1021/jp203151y.en
dc.identifier.issn1932-7447en
dc.identifier.issn1932-7455en
dc.identifier.doi10.1021/jp203151yen
dc.identifier.urihttp://hdl.handle.net/10754/598506en
dc.description.abstractThe role of the oxide-metal interface in determining the activity and selectivity of chemical reactions catalyzed by metal particles on an oxide support is an important topic in science and industry. A proposed mechanism for this strong metal-support interaction is electronic activation of surface adsorbates by charge carriers. Motivated by the goal of using electronic activation to drive nonthermal chemistry, we investigated the ability of the oxide support to mediate charge transfer. We report an approximately 2-fold increase in the turnover rate of catalytic carbon monoxide oxidation on platinum nanoparticles supported on stoichiometric titanium dioxide (TiO2) when the TiO2 is made highly n-type by fluorine (F) doping. However, for nonstoichiometric titanium oxide (TiOX<2) the effect of F on the turnover rate is negligible. Studies of the titanium oxide electronic structure show that the energy of free electrons in the oxide determines the rate of reaction. These results suggest that highly n-type TiO2 electronically activates adsorbed oxygen (O) by electron spillover to form an active O- intermediate. © 2011 American Chemical Society.en
dc.description.sponsorshipDeposition and processing of titanium oxide films took place in the Marvell Nanolab at the University of California, Berkeley (UCB). X-ray photoelectron spectroscopy and scattering electron microscopy took place in the Molecular Foundry at Lawrence Berkeley National Lab. This work was funded by the Helios Solar Energy Research Center and by the Chemical Sciences Division, which are supported by the Director, Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 and by the UCB-KAUST Academic Excellence Alliance (AEA) Program.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleHighly n-Type Titanium Oxide as an Electronically Active Support for Platinum in the Catalytic Oxidation of Carbon Monoxideen
dc.typeArticleen
dc.identifier.journalThe Journal of Physical Chemistry Cen
dc.contributor.institutionLawrence Berkeley National Laboratory, Berkeley, United Statesen
dc.contributor.institutionUC Berkeley, Berkeley, United Statesen
kaust.grant.programAcademic Excellence Alliance (AEA)en
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