Activation of Cu(111) surface by decomposition into nanoclusters driven by CO adsorption

Eren, B.; Zherebetskyy, D.; Patera, L. L.; Wu, C. H.; Bluhm, H.; Africh, C.; Wang, L. -W.; Somorjai, G. A.; Salmeron, M.

doi:10.1126/science.aad8868

Activation of Cu(111) surface by decomposition into nanoclusters driven by CO adsorption

Journal Article · Thu Jan 28 23:00:00 EST 2016 · Science

DOI:https://doi.org/10.1126/science.aad8868· OSTI ID:1434969

Eren, B.; Zherebetskyy, D.; Patera, L. L.; Wu, C. H.; Bluhm, H.; Africh, C.; Wang, L. -W.; Somorjai, G. A.; Salmeron, M.

The (111) surface of copper (Cu), its most compact and lowest energy surface, became unstable when exposed to carbon monoxide (CO) gas. Scanning tunneling microscopy revealed that at room temperature in the pressure range 0.1 to 100 Torr, the surface decomposed into clusters decorated by CO molecules attached to edge atoms. Between 0.2 and a few Torr CO, the clusters became mobile in the scale of minutes. Density functional theory showed that the energy gain from CO binding to low-coordinated Cu atoms and the weakening of binding of Cu to neighboring atoms help drive this process. Particularly for softer metals, the optimal balance of these two effects occurs near reaction conditions. Finally, cluster formation activated the surface for water dissociation, an important step in the water-gas shift reaction.

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1434969

Alternate ID(s):: OSTI ID: 1608256
OSTI ID: 1565513

Journal Information:: Science, Journal Name: Science Journal Issue: 6272 Vol. 351; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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