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Diffusion versus Desorption: Complex Behavior of H Atoms on an Oxide Surface
Author(s) -
Yin X.L.,
Calatayud M.,
Qiu H.,
Wang Y.,
Birkner A.,
Minot C.,
Wöll Ch.
Publication year - 2008
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200700612
Subject(s) - desorption , diffusion , rutile , adsorption , oxide , hydrogen , activation energy , chemical physics , thermal desorption spectroscopy , surface diffusion , chemistry , materials science , analytical chemistry (journal) , crystallography , thermodynamics , physics , organic chemistry , chromatography
Adsorption of atomic hydrogen on single‐crystalline rutile TiO 2 (110)‐(1×1) (see picture) at room temperature leads to ordered H adlayers with (1×1) periodicity and many vacancies. Unexpectedly, almost no recombinative desorption of H 2 (or H 2 O) occurs on heating to above 600 K, because the activation energy of 1.11 eV for H atoms migrating into the bulk is significantly smaller as shown by DFT calculations.