Electrocatalytic oxidation of ethylene glycol: Part III. In-situ infrared reflectance spectroscopic study of the strongly bound species resulting from its chemisorption at a platinum electrode in aqueous medium |
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| Affiliation: | 1. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;2. University of Chinese Academy of Sciences, Beijing 100039, China;3. Department of Chemistry and Physics, State University of New York at Stony Brook, New York, NY 11794-3400, USA;1. Instituto de Química, Universidade Federal de Mato Grosso do Sul, C.P. 549, 79070-900 Campo Grande, Brazil;2. Univ. Grenoble Alpes, LEPMI, F-38000 Grenoble, France;3. CNRS, LEPMI, F-38000 Grenoble, France;4. Institut Universitaire de France (IUF), Paris, France |
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| Abstract: | The adsorption of ethylene glycol (EG) at a platinum electrode in aqueous medium was investigated using Electrochemically Modulated Infrared Reflectance Spectroscopy.The adsorption appears to the dissociative at any pH. However, striking changes occur in the composition of the adsorbed layer when the pH is varied from acid to alkaline solutions. Thus, linearly bonded CO is dominant at pH ∼ 1, whereas almost equal amounts of bridge-bonded and linearly bonded CO species are found at pH ∼ 13.No other adsorbed residue has been detected in the experimental conditions observed and for the wavelength ranges investigated. But detailed analysis of the spectroscopic data leads to the conclusion that other adsorbed organic species might be present on the electrode surface, at least in acid medium. |
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