Atomic-Scale View on the H2O Formation Reaction from H2 on O-Rich RuO2(110)

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The H2O formation reaction from H-2 on O-rich RuO2(110) was studied by temperature-programmed desorption and reaction (TPD/TPR) and scanning tunneling microscopy (STM) measurements and density functional theory (DFT) calculations. On the one hand, following H-2 adsorption at 270 K, our TPD/TPR measurements reveal that the on-top O species (Oot) enhances the sticking probability of H-2, thus facilitating the H-2 adsorption and dissociation on O-rich RuO2(110). On the other hand, for low H-2 adsorption temperature (170 K), the limited mobility of Had species hinders H-2 adsorption at a high coverage of preadsorbed Oot. To better understand the strong influence of the adsorption temperature and the interplay between coadsorbed species, we conducted DFT calculations and high-resolution STM measurements. Two distinct adsorbate configurations, Had-Oot and Oot-Had-Oot, are identified by STM. Mechanisms and molecular models for H-2 dissociation and Had diffusion on O-rich RuO2(110) are proposed.
Original languageEnglish
JournalThe Journal of Physical Chemistry Part C
Volume118
Issue48
Pages (from-to) 27989-27997
Number of pages9
ISSN1932-7447
DOIs
Publication statusPublished - Nov 2014

    Research areas

  • SCANNING-TUNNELING-MICROSCOPY; SURFACE-CHEMISTRY; RUTHENIUM DIOXIDE, RuO2(110), PHOTOCATALYSIS, HYDROGEN, OXYGEN, water formation, OXIDE SURFACE

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