Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 12, Pages 4549-4553Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.02.076
Keywords
Glycerol electrooxidation; CO(2) production; Spectroelectrochemistry; FTIR in situ; Direct alcohol fuel cells
Categories
Funding
- CNPq
- FUNDECT
- CAPES
- FINEP
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In this work we investigate the glycerol electrooxidation reaction on polycrystalline platinum in acid media. Cyclic voltammetry shows the existence of multiple oxidation peaks, which are related with a complex electrooxidation mechanism. We follow the voltammetric response of Pt in the presence of glycerol by using FIR in situ. Results show that during glycerol electrooxidation massive amounts of CO(2) are produced. The production of CO(2) begins at low potentials and depends on the previous formation of adsorbed CO. This pathway is accelerated at high potentials and seems to be the main responsible for the rising of the currents observed in the cyclic voltammogram for potentials up to 1.0V. Moreover, there is a parallel pathway involving the production of a carboxylic acid (probably glyceric acid), but the relative magnitudes of CO(2) bands and acid bands makes clear that the production of CO(2) is the dominant feature of the spectra, suggesting that glycerol can be a suitable candidate for use in direct alcohol fuel cells. (c) 2011 Elsevier Ltd. All rights reserved.
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