COLL 260 |
| Andrzej Wieckowski1, Lajos Gancs1, Matthew McGovern1, Guo-Qiang Lu1, Radoslav Atanasoski2, and Mark K. Debe2. (1) Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, (2) Corporate Research Labs, 3M Company, St. Paul, MN 55144 |
| Adsorption of carbon monoxide (CO) is a broadly utilized vibrational probe to examine electrode surface properties in relation to surface structure and catalytic activity. In this presentation, electrochemical infrared reflection-absorption spectroscopy (IRAS) has been applied to study Pt-based nanoparticles as well as fuel-cell catalyst coated membranes produced in the 3M-research center. The 3M materials display unique nanoscale morphologies not fundamentally investigated before. Well distributed rather than aggregated metal nanoparticle arrays are achieved via a special nanoparticle immobilization technique previously developed for infrared studies by Mike Weaver. The decreased Stark tuning rate in the hydrogen region suggests a strong interaction between the nanoparticles and the underlying support, which can alter the catalyst activity behavior. As a model system for the nanoparticle catalysts, single crystal surfaces of Pt(111) Pt(111)/Ru are studied using sum frequency generation (SFG), and data from that end will also be presented. |
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Vibrational Analyses of Dry and Wet Surfaces
6:00 PM-8:00 PM, Monday, March 29, 2004 Disneyland -- North Exhibit Hall, Poster
Division of Colloid and Surface Chemistry |