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The reaction of O2 and residual H over platinum in high vacuum, at temperatures from 60 K to room temperature, was studied by using field-evaporation techniques, including field ion microscopy (FIM) and atom probe (AP), which enabled in-situ analysis of surface structure and chemical composition analysis at atomic scale. This study aimed to obtain detailed information about the reaction of O2 and residual H on a Pt surface. Hydrogen is a near-ubiquitous element and field-evaporation technique can be used to study the residual H in high vacuum conditions. Three H species on a Pt surface were observed H, H2, and H3 in high vacuum (10 Pa). Upon the exposure of the nanoscale Pt surface to O2 atmosphere (10 Pa), H2O was produced for the temperatures above 135 K. According to the peak intensity ratio between H2-3O and O2 during the warming up process, H2 surface diffusion along the shank and the bulk H diffusion were faster at higher temperatures. In addition, we found that the planes surrounding the {111} plane, such as the {240} plane, were more active owning to their particularly rough atomic corrugation.

journal of surface analysis

The Interaction of O&lt;sub&gt;2&lt;/sub&gt; and Residual H on Pt Surface Studied by Field Ion Microscopy and &lt;i&gt;in-situ&lt;/i&gt; Surface Atom Probe