Diffusion versus Desorption: Complex Behavior of H Atoms on an Oxide Surface

  • chair: Yin, X. -L. / Calatayud, M. / Qiu, H. / Wang, Y. / Birkner, A. / Minot, C. / Wöll, Ch. (2008)

  • place: ChemPhysChem 9 (2008), 2, 253-256

  • Date: 2008

  • Yin, X. -L. / Calatayud, M. / Qiu, H. / Wang, Y. / Birkner, A. / Minot, C. / Wöll, Ch. (2008): „Diffusion versus Desorption: Complex Behavior of H Atoms on an Oxide Surface“. In: ChemPhysChem 9 (2008), 2, 253-256

Abstract

Adsorption of atomic hydrogen on single-crystalline rutile TiO2(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 H2 (or H2O) 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.

 

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