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Concentration dependence of the electro-oxidation of ethanol and ethylene glycol at platinum in alkaline medium

: Bayer, D.; Berenger, S.; Cremers, C.; Tübke, J.


Chu, D. ; Electrochemical Society -ECS-, Energy Technology Division; Electrochemical Society -ECS-, Physical and Analytical Electrochemistry Division; Electrochemical Society -ECS-, Battery Division:
Alkaline electrochemical power sources : Originally presented in the Symposium "Alkaline Electrochemistry in Fuel Cells" held during the 216th meeting of the Electrochemical Society, in Vienna, Austria from October 4 to 9, 2009
Pennington, NJ: ECS, 2010 (ECS transactions 25, 13)
ISBN: 978-1-607-68130-4
ISBN: 978-1-56677-780-3
ISSN: 1938-5862
Symposium "Alkaline Electrochemistry in Fuel Cells" <2009, Vienna>
Electrochemical Society (Meeting) <216, 2009, Vienna>
Conference Paper
Fraunhofer ICT ()

In the present work, the electro-oxidation of ethanol and ethylene glycol in alkaline medium is studied depending on their concentration by cyclic voltammetry, chronoamperometry and differential electrochemical mass spectrometry (DEMS). It is shown that in the case of ethanol, carbon dioxide as product of the oxidation can only be found during cyclic voltammetry. Within the investigated concentration range, potentiostatic experiments do not indicate bulk oxidation of ethanol to carbon dioxide. For ethylene glycol, the oxidation in cyclic voltammetry as well as in chronoamperometric experiments leads to significant carbon dioxide formation with the tendency that low concentrations and low potentials yield high carbon dioxide current efficiencies. Furthermore, comparatively higher current densities in cyclic voltammetry and chronoamperometric experiments indicate that with respect to ethanol, ethylene glycol is more active and the poisoning effect on platinum in alkaline medium is less severe.