Journal
CHEMPHYSCHEM
Volume 16, Issue 17, Pages 3642-3651Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201500619
Keywords
metal nanoparticles; nucleation; oxides; self-assembly; stepped surfaces
Funding
- European Community [604307]
- Italian MIUR through the FIRB Project [RBAP115AYN]
- COST Action [CM1104]
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It is generally assumed that low-coordinated sites at extended defects of oxide surfaces like steps or edges are more reactive than the regular, fully coordinated sites at the flat terraces. In this work we have considered the properties of stepped surfaces of anatase TiO2 and tetragonal ZrO2 by means of periodic DFT+U calculations. For both oxides, the stability of oxygen vacancies located near the step edges is compared to that of the same defects at the regular terraces. The capability of the steps to induce nucleation of metal nanoparticles on the surface has been evaluated by simulating the adsorption of a single ruthenium adatom. We conclude that, for anatase, step edges have no particular role in favouring the reduction of the oxide by reducing the cost for oxygen abstraction; in the same way, there is no special role of the stepped anatase surface in stabilizing adsorbed Ru atoms. On the contrary, step edges on zirconia display some capability to stabilise oxygen vacancies and ruthenium adatoms.
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