Ab initio theory of Cr$_2$O$_3$ surface chemistry in solution

Details Ab initio theory of Cr$_2$O$_3$ surface chemistry in solution Ab initio theory of Cr$_2$O$_3$ surface chemistry in solution

2004-11-19

arxiv.org/abs/cond-mat/0411523v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

Using a new form of density functional theory for the {\em ab initio} description of electronic systems in contact with a dielectric environment, we present the first detailed study of the impact of a solvent on the surface chemistry of Cr$_2$O$_3$, the passivating layer of stainless steel alloys. Compared to vacuum, we predict that the presence of water has little impact on the adsorption of chloride ions to the oxygen-terminated surface but a dramatic effect on the binding of hydrogen to that surface. These results indicate that the dielectric screening properties of water are important to the passivating effects of the oxygen-terminated surface.

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