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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Yin et al. (2008) studied this question.
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