Photocatalytic Activity of Bulk TiO{sub 2} Anatase and Rutile Single Crystals Using Infrared Absorption Spectroscopy

Journal Article · Fri Apr 01 04:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.138302· OSTI ID:21550265

Mingchun, Xu; Youkun, Gao ^[1]; Moreno, Elias Martinez; Kunst, Marinus ^[2]; Muhler, Martin ^[3]; Yuemin, Wang ^[1]; Idriss, Hicham ^[4]; Woell, Christof ^[5]

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1. Department of Physical Chemistry I, Ruhr-Universitaet Bochum, 44780 (Germany)
2. Hahn-Meitner-Institut, Glienicker Strasse 100, D-1000 Berlin 39 (Germany)
3. Laboratory of Industrial Chemistry, Ruhr-Universitaet Bochum, 44780 (Germany)
4. Department of Chemistry, University of Aberdeen and School of Engineering, Robert Gordon University, AB24 3EU Aberdeen, Scotland (United Kingdom)
5. Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe (Germany)

A systematic study on the photocatalytic activity of well-defined, macroscopic bulk single-crystal TiO{sub 2} anatase and rutile samples has been carried out, which allows us to link photoreactions at surfaces of well-defined oxide semiconductors to an important bulk property with regard to photochemistry, the life time of e-h pairs generated in the bulk of the oxides by photon absorption. The anatase (101) surface shows a substantially higher activity, by an order of magnitude, for CO photo-oxidation to CO{sub 2} than the rutile (110) surface. This surprisingly large difference in activity tracks the bulk e-h pair lifetime difference for the two TiO{sub 2} modifications as determined by contactless transient photoconductance measurements on the corresponding bulk materials.

• OSTI ID: 21550265
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 106; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ABSORPTION SPECTROSCOPY
BOSONS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTARY PARTICLES
LIFETIME
MASSLESS PARTICLES
MATERIALS
MINERALS
MONOCRYSTALS
OXIDATION
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE TRACKS
PHOTOCATALYSIS
PHOTOCHEMISTRY
PHOTOCONDUCTIVITY
PHOTONS
PHYSICAL PROPERTIES
RADIOACTIVE MATERIALS
RADIOACTIVE MINERALS
RUTILE
SEMICONDUCTOR MATERIALS
SORPTION
SPECTROSCOPY
SURFACES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSIENTS
TRANSITION ELEMENT COMPOUNDS