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Development of electro-catalysts for the alcohol oxidation in anion exchange membrane direct alcohol fuel cells

: Cremers, C.; Bayer, D.; Meier, J.; Berenger, S.; Kintzel, B.; Joos, M.; 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 ()

The oxidation of ethanol and ethylene glycol at platinum as model catalyst was investigated in potassium hydroxide solution. Experiments comprised the investigation of formed adsorbates by stripping voltammetry of pre-adsorbed alcohols and the investigation of the bulk oxidation as function of the alcohol bulk concentration by cyclic voltammetry and chronoamperometry. For all measurements online mass spectrometry was used to detect the volatile reaction products. For both alcohols it was found that during stripping experiments only the C1 products methane and CO2 are formed. For the bulk oxidation of ethanol the CO2 current efficiency rapidly decreases with increasing ethanol concentration showing hardly any CO2 formation at technical relevant concentrations. Although CO2 current efficiencies also dropped for the ethylene glycol oxidation with increasing concentration,the effect was much less pronounced. CO2 formation was thus also observed at technical relevant ethylen e glycol concentrations even after longer times under potentiostatic conditions indicating true bulk oxidation of ethylene glycol to CO2.