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Morphology-dependent activity of Pt nanocatalysts for ethanol oxidation in acidic media: Nanowires versus nanoparticles |
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| Authors: | Wei-Ping Zhou Meng Li Christopher Koenigsmann Chao Ma Stanislaus S Wong Radoslav R Adzic |
| Affiliation: | aChemistry Department, Brookhaven National Laboratory, Upton, NY 11973, United States;bDepartment of Chemistry, State University of New York at Stony Brook, Stony Brook, NY 11794, United States;cCondensed Matter Physics and Materials Sciences Department, Brookhaven National Laboratory, Building 480, Upton, NY 11973, United States |
| Abstract: | The morphology of nanostructured Pt catalysts is known to affect significantly the kinetics of various reactions. Herein, we report on a pronounced morphology effect in the electrooxidation of ethanol and carbon monoxide (CO) on Pt nanowires and nanoparticles in an acidic solution. The high resolution transmission electron microscopy analysis showed the inherent morphology difference between these two nanostructured catalysts. Voltammetric and chronoamperometric studies of the ethanol electrooxidation revealed that these nanowires had a higher catalytic activity by a factor of two relative to these nanoparticles. The rate for CO monolayer oxidation exhibits similar morphology-dependent behavior with a markedly enhanced rate on the Pt nanowires. In situ infrared reflection–absorption spectroscopy measurements revealed a different trend for chemisorbed CO formation and CO2-to-acetic acid reaction product ratios on these two nanostructures. The morphology-induced change in catalytic activity and selectivity in ethanol electrocatalysis is discussed in detail. |
| Keywords: | Fuel cell Heterogeneous catalysis Platinum Nanowires Ethanol oxidation |
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