Ru-modified Pt(100) surfaces: Effect of annealing on the adsorption of CO as monitored by Infrared Reflection Absorption Spectroscopy (IRAS) in ultrahigh vacuum

Nelson C. Yee, Gary S. Chottiner, Daniel Alberto Scherson

Research output: Contribution to conferencePaper

Abstract

Time-resolved IRAS spectra were collected during the adsorption of CO at 105K on Ru-modified Pt(100) (Ru/Pt) surfaces prepared by chemical vapor deposition in ultrahigh vacuum (UHV). Two linear CO-stretching features centered at about 2085-2100 cm -1 and 2068-2092 cm -1 were identified over a wide range of CO exposures on a Ru/Pt surface initially θ Ru = 0.52, as determined by XPS, and attributed to CO adsorption on bare Pt(100) and Ru-induced Pt sites, respectively. Changes in the relative magnitudes of these features were observed following annealing of θ Ru = 0.52 Ru/Pt surface at 2.5h intervals, while the amount of Ru detected by XPS remained constant. Plots of the IRAS spectra obtained after each annealing step displayed an isosbestic point consistent with a progressive interconversion of the two adsorption sites identified on the initially prepared surface. This behavior was attributed to a thermally-induced surface incorporation of Ru into Pt, as evidenced from low energy ion scattering spectroscopy (LEISS) for other Ru-modified low index single crystal Pt surfaces (Davies, et al. Electrochim. Acta. 1998, 44, 1181).

Original languageEnglish
Pages1-6
Number of pages6
Publication statusPublished - 2004 Dec 1
Externally publishedYes
Event206th ECS Meeting - Honolulu, HI, United States
Duration: 2004 Oct 32004 Oct 8

Conference

Conference206th ECS Meeting
CountryUnited States
CityHonolulu, HI
Period04/10/304/10/8

ASJC Scopus subject areas

  • Engineering(all)

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    Yee, N. C., Chottiner, G. S., & Scherson, D. A. (2004). Ru-modified Pt(100) surfaces: Effect of annealing on the adsorption of CO as monitored by Infrared Reflection Absorption Spectroscopy (IRAS) in ultrahigh vacuum. 1-6. Paper presented at 206th ECS Meeting, Honolulu, HI, United States.