Journal
JOURNAL OF POWER SOURCES
Volume 161, Issue 2, Pages 761-767Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2006.05.002
Keywords
2-propanol; methanol; direct alcohol fuel cell; alkaline
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The potentiodynamic and potentiostatic electro-oxidations of 2-propanol over rough platinum electrodes were carried out in alkaline electrolytes. A substantive current maximum occurs at low potentials during potentiostatic electro-oxidations of 2-propanot in the presence of base. The magnitude of this current maximum increases as the concentration of either 2-propanol or hydroxide is increased, while increasing the concentration of hydroxide also causes a Nerstian shift in the peak potential to lower values. Experiments were carried out that indicate the high currents observed at low potentials are due to a rapid electro-oxidation of 2-propanol to acetone that proceeds through intermediates that are weakly adsorbed to the platinum surface. The electro-oxidation of acetone commences at potentials higher than the electro-oxidation of 2-propanol to acetone, and it proceeds through strongly adsorbed intermediates. (c) 2006 Elsevier B.V. All rights reserved.
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