A detailed TPD study of H2O and pre-adsorbed O on the stepped Pt(553) surface
Literature Information
Maria J. T. C. van der Niet, Angela den Dunnen, Ludo B. F. Juurlink, Marc T. M. Koper
Water molecules desorbing from the bare Pt(553) surface desorb in a three peak structure, associated with, respectively, desorption from step and terrace sites and the water multilayer. Upon pre-covering the step sites with Oad we mainly observe OH formation on step sites. When terrace sites are also pre-covered with Oad, OHterrace formation is favored over OHstep formation, presumably because OH formed at terrace sites is more easily incorporated in a hydrogen bonded network of OH/H2O. This is a gradual process: with increasing θO less OHstep is formed. Thus, in spite of the fact that OH at step sites has a higher binding energy than OH at terrace sites, the possibility of the formation of OH at terrace sites actually inhibits the formation of OH at step sites, leaving Ostep as the most stable water dissociation product on the step.
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