Abstract
Abstract : This project has focused on a detailed study of electrocatalysis of organic fuels and important intermediates (COads) on platinum and platinum alloy electrocatalysts, using advanced NMR tools developed in our laboratory. The highlights of the results include: * CO(g) and CH30H adsorb onto and are oxidized from two types of Pt sites: weakly-bound (WB) hydrogen closely-packed sites, and strongly-bound (SB) hydrogen loosely-packed sites. * Relative rates of adsorption have been measured for CO(g) and CH30H on the two types of Pt sites. * The CV for COacts oxidation has been modeled and deconvoluted, and COads oxidation rate constants have been measured for various surface coverages. * The 13COads NMR results are consistent with the two-site model. The NMR peak shift quantitatively indicates the relative occupancy of the two types of sites. * The 13COads NMR peak shape and relaxation times are consistent with a two-site exchange model for COads mobility on Pt surfaces. The exchange rate constant has been measured, and the frequency difference for the 13CO NMR lines corresponding to the two types of sites has been determined.
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