COLL 80 |
| Sungho Park1, Panakkattu K. Babu2, Andrzej Wieckowski2, and Michael J. Weaver1. (1) Dept of Chemistry, Purdue University, West Lafayette, IN 47907, (2) Dept of Chemistry, University of Illinois, 600 S. Mathews Ave, Urbana, IL 61801 |
| Spectra obtained by electrochemical infrared reflection absorption spectroscopy (EC-IRAS) for carbon monoxide (CO) adlayers formed on various ruthenium-decorated platinum nanoparticle films are reported. The need to achieve a well distributed rather than aggregated metal nanoparticle array is demonstrated, the strategy here is to use an "organic glue matrix" between the nanoparticles and the gold substrates. The observed promotion in CO electrooxidation by the existence of Ru island on Pt nanoparticles, of interest to fuel-cell catalysis, showed a strong relationship with Ru surface concentrations, consistent with previous studies on single crystal or polycrystalline bimetallic surfaces. Two distinctive CO infrared bands, one for Pt-CO and one for Ru-CO, could be distinguished after minimizing the dipole coupling of CO between two domains. Interestingly, those two CO bands showed independent electrooxidation behavior with electrode potential changes. The activity of commercial Pt/Ru alloy nanoparticles was tested as a comparison to our Ru-decorated Pt nanoparticles. Comparison with the EC-NMR data for equivalent Pt/Ru systems will be made. |
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Electrochemistry and Surface Science Symposium in Memory of Mike Weaver
Division of Colloid and Surface Chemistry |