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Hydrogenation of O and OH on Pt(111): A comparison between the reaction rates of the first and the second hydrogen addition steps
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, United States.
2014 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 140, no 10, 104701- p.Article in journal (Refereed) Published
Abstract [en]

The formation of water through hydrogenation of oxygen on platinum occurs at a surprisingly low reaction rate. The reaction rate limited process for this catalytic reaction is, however, yet to be settled. In the present work, the reaction rates of the first and the second hydrogen addition steps are compared when hydrogen is obtained through intense synchrotron radiation that induces proton production in a water overlayer on top of the adsorbed oxygen species. A substantial amount of the produced hydrogen diffuses to the platinum surface and promotes water formation at the two starting conditions O/Pt(111) and (H 2O+OH)/Pt(111). The comparison shows no significant difference in the reaction rate between the first and the second hydrogen addition steps, which indicates that the rate determining process of the water formation from oxygen on Pt(111) is neither the first nor the second H addition step or, alternatively, that both H addition steps exert rate control. © 2014 AIP Publishing LLC.

Place, publisher, year, edition, pages
American Institute of Physics (AIP) , 2014. Vol. 140, no 10, 104701- p.
National Category
Physical Sciences
URN: urn:nbn:se:liu:diva-116405DOI: 10.1063/1.4867535ISI: 000334120300046PubMedID: 24628190ScopusID: 2-s2.0-84896327894OAI: diva2:798737
Available from: 2015-03-27 Created: 2015-03-26 Last updated: 2015-06-01

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