Reactivity of TiO2 with hydrogen and deuterium

Yang Y., Sushchikh M., Mills G., Metiu H. and McFarland E. (2004) Reactivity of TiO2 with hydrogen and deuterium. Applied Surface Science, 229 1-4: 346-351. doi:10.1016/j.apsusc.2004.02.018


Author Yang Y.
Sushchikh M.
Mills G.
Metiu H.
McFarland E.
Title Reactivity of TiO2 with hydrogen and deuterium
Journal name Applied Surface Science   Check publisher's open access policy
ISSN 0169-4332
Publication date 2004-05-15
Sub-type Article (original research)
DOI 10.1016/j.apsusc.2004.02.018
Open Access Status Not yet assessed
Volume 229
Issue 1-4
Start page 346
End page 351
Total pages 6
Language eng
Subject 1606 Political Science
2508 Surfaces, Coatings and Films
3104 Condensed Matter Physics
Abstract The reactivity of rutile phase TiO2 (110) and polycrystalline anatase surfaces with molecular and ionized deuterium and hydrogen was investigated. Thermal Desorption Spectroscopy (TDS), following exposure to more than 100kL of molecular deuterium, showed a D2 desorption peak at ∼440K on both single crystal rutile and polycrystalline anatase surfaces. The desorption peak was observed following exposure only at surface temperatures between 140-270K. Ionized D2 is significantly more reactive with the titania surface and two desorption peaks at 380K and ∼550K were observed together with a small D2O peak observed at ∼440K. Dosing the surfaces with hydrogen and deuterium either in succession or as a mixture showed HD desorption with no change in the desorption peaks, consistent with dissociative adsorption of both ionized and molecular species. The experimental data was compared to Density Functional Theory calculations and modeled as a two-step process of hydrogen dissociation at oxygen vacancy sites on TiO 2.
Keyword Deuterium
Hydrogen
TDS
TiO2
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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