Step-Type Selective Oxidation of Platinum Surfaces

• DOI: 10.1021/acs.jpcc.6b05482
• Publication Date: 2016-09-22T01:48:32Z
• Authors: Cansin Badan; Rachael G. Farber; Yasmine Heyrich; Marc T. M. Koper; Daniel R. Killelea; Ludo B. F. Juurlink
• Keywords: 01 natural sciences; 0104 chemical sciences

We report on a combined TPD and STM study of O2 adsorption dissociation various Pt surfaces with varying (111) terrace widths either (110) or (100) step geometries. Our quantitative results show that stepped adsorb considerably more oxygen at 100 K, regardless width, than planar Pt(111). These suggest dissociates the well lower required for temperature-induced planes. The amount desorbing from recombinative desorption adsorbed atoms is also greater surfaces. In addition, partitioning between molecular dissociative states depends geometry; an uptake plateau indicative threshold surface concentration low-temperature dissociation, whereas do not. Scanning tunneling microscope (STM) images O coverages deposition temperatures confirm surface. width not factor in lowered barriers