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

Fingerprint

Ultrahigh vacuum
Absorption spectroscopy
Annealing
Infrared radiation
Adsorption
X ray photoelectron spectroscopy
Single crystal surfaces
Stretching
Chemical vapor deposition
Spectroscopy
Scattering
Ions

ASJC Scopus subject areas

  • Engineering(all)

Cite this

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.

Ru-modified Pt(100) surfaces : Effect of annealing on the adsorption of CO as monitored by Infrared Reflection Absorption Spectroscopy (IRAS) in ultrahigh vacuum. / Yee, Nelson C.; Chottiner, Gary S.; Scherson, Daniel Alberto.

2004. 1-6 Paper presented at 206th ECS Meeting, Honolulu, HI, United States.

Research output: Contribution to conferencePaper

Yee, NC, Chottiner, GS & Scherson, DA 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', Paper presented at 206th ECS Meeting, Honolulu, HI, United States, 04/10/3 - 04/10/8 pp. 1-6.
Yee NC, Chottiner GS, Scherson DA. Ru-modified Pt(100) surfaces: Effect of annealing on the adsorption of CO as monitored by Infrared Reflection Absorption Spectroscopy (IRAS) in ultrahigh vacuum. 2004. Paper presented at 206th ECS Meeting, Honolulu, HI, United States.
Yee, Nelson C. ; Chottiner, Gary S. ; Scherson, Daniel Alberto. / Ru-modified Pt(100) surfaces : Effect of annealing on the adsorption of CO as monitored by Infrared Reflection Absorption Spectroscopy (IRAS) in ultrahigh vacuum. Paper presented at 206th ECS Meeting, Honolulu, HI, United States.6 p.
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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).",
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