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

Journal Article · Fri Apr 01 00:00:00 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, Vol. 106, Issue 13; Other Information: DOI: 10.1103/PhysRevLett.106.138302; (c) 2011 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

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