Effects of the cooperative interaction on the diffusion of hydrogen on MgO(100)

Ivano E. Castelli, Stefan G. Soriga, Isabela C. Man*

*Corresponding author for this work

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Understanding hydrogen diffusion is important for applications such as hydrogen storage and spillover materials. On semiconductors, where paired electron acceptors and donors stabilize each other, the hydrogen diffusion depends on the number of adsorbed fragments. Using density functional theory, we investigate the effects of preadsorbed hydrogens on activation energy and reaction path for hydrogen diffusion on MgO(100): the presence of an unpaired hydrogen causes a diffusion, on O-sites, above the surface with a lower activation energy compared to the case of paired hydrogens where the diffusion distorts the surface. This effect is missing for diffusion on Mg-sites. Published by AIP Publishing.
Original languageEnglish
Article number034704
JournalJournal of Chemical Physics
Issue number3
Number of pages7
Publication statusPublished - 2018

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