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Influence of the nature of the carbon support on the activity of Pt/C catalysts for ethanol and carbon monoxide oxidation

AuthorsRizo, Rubén; Sebastián del Río, David ; Lázaro Elorri, María Jesús ; Rodríguez, José Luis; Pastor Tejera, Elena
KeywordsEthanol electrooxidation
Pt electrocatalysts
Differential electrochemical mass spectrometry
Fourier transform infrared spectroscopy
Direct ethanol fuel cell
Issue Date3-Mar-2017
CitationJournal of Catalysis 348: 22-28 (2017)
AbstractThe electrooxidation of ethanol and carbon monoxide on Pt nanoparticles (NPs) supported on carbon nanofibers (CNFs) and carbon blacks (oxidized and non-oxidized) is studied. Quite similar characteristics are found for Pt NPs, including particle size and crystal phases, regardless of the nature of carbon support. Cyclic voltammetries and current-transient curves show higher ethanol oxidation current density for Pt/CNF than for Pt/Vulcan. In situ spectroelectrochemical techniques including Fourier transform infrared spectroscopy (FTIR) and differential electrochemical mass spectrometry (DEMS), are employed in order to identify adsorbed reaction intermediates and products. Pt/CNF results in a lower CO poisoning of the NP surface compared to Pt/Vulcan, allowing higher amount of free Pt active sites for the oxidation of ethanol which leads to the formation of acetic acid during the reaction.
Publisher version (URL)https://doi.org/10.1016/j.jcat.2017.02.007
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