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“In situ” analysis by infrared reflectance spectroscopy of the adsorbed species resulting from the electrosorption of ethanol on platinum in acid medium

Authors
Journal
Journal of Electroanalytical Chemistry
0022-0728
Publisher
Elsevier
Publication Date
Volume
229
Identifiers
DOI: 10.1016/0022-0728(87)85152-5
Disciplines
  • Physics

Abstract

Abstract The adsorption of ethanol at a platinum electrode from a perchloric acid electrolytic solution has been investigated thoroughly, using infrared reflectance spectroscopy. Depending on the electrode potential, numerous infrared bands were detected, which could be attributed to various potential-dependent co-existing species. Among them, adsorbed CO, mainly linearly bonded to the surface, was detected unambiguously, giving rise to a strong absorption band at 2070 cm −1. when the potential range was chosen so that the CO species did not cover the whole surface, new bands appeared, due to various CH stretches together with a strong CO stretch at 1055 cm −1. Different models for the adsorbed species are discussed, including molecular adsorption of ethanol (evidence of weak infrared bands), adsorption of the ethoxy group [CH 3CH 2O] −, and the adsorbed ethylate species [CH 3CO] −.

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