Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 27, Pages 9824-9830Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.08.055
Keywords
Fuel cell; Heterogeneous catalysis; Platinum; Nanowires; Ethanol oxidation
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Funding
- U.S. Department of Energy, Divisions of Chemical and Material Sciences [DE-AC02-98CH10886]
- U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division
- Brookhaven National Laboratory
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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. (C) 2011 Elsevier Ltd. All rights reserved.
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