Chemical states of surface oxygen during CO oxidation on Pt(1 1 0) surface revealed by ambient pressure XPS

Youngseok Yu, Yoobin Esther Koh, Hojoon Lim, Beomgyun Jeong, Kazuhisa Isegawa, Daehyun Kim, Kohei Ueda, Hiroshi Kondoh, Kazuhiko Mase, Ethan J. Crumlin, Philip N. Ross, Jean Jacques Gallet, Fabrice Bournel, Bongjin Simon Mun

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8 Citations (Scopus)

Abstract

The study of CO oxidation on Pt(1 1 0) surface is revisited using ambient pressure x-ray photoemission spectroscopy. When the surface temperature reaches the activation temperature for CO oxidation under elevated pressure conditions, both the α-phase of PtO2 oxide and chemisorbed oxygen are formed simultaneously on the surface. Due to the exothermic nature of CO oxidation, the temperature of the Pt surface increases as CO oxidation takes place. As the CO/O2 ratio increases, the production of CO2 increases continuously and the surface temperature also increases. Interestingly, within the diffusion limited regions, the amount of surface oxide changes little while the chemisorbed oxygen is reduced.

Original languageEnglish
Article number464001
JournalJournal of Physics Condensed Matter
Volume29
Issue number46
DOIs
Publication statusPublished - 2017 Oct 20

Keywords

  • CO oxidation
  • Pt(1 1 0)
  • ambient pressure XPS
  • surface oxide

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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    Yu, Y., Koh, Y. E., Lim, H., Jeong, B., Isegawa, K., Kim, D., Ueda, K., Kondoh, H., Mase, K., Crumlin, E. J., Ross, P. N., Gallet, J. J., Bournel, F., & Mun, B. S. (2017). Chemical states of surface oxygen during CO oxidation on Pt(1 1 0) surface revealed by ambient pressure XPS. Journal of Physics Condensed Matter, 29(46), [464001]. https://doi.org/10.1088/1361-648X/aa889e