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Cyclic voltammetric behaviour of dimensionally stable anodes in the presence of C1 - C3 aldehydes

Author(s): Malpass Geoffroy R. P. | Motheo Artur J.

Journal: Journal of the Brazilian Chemical Society
ISSN 0103-5053

Volume: 14;
Issue: 4;
Start page: 645;
Date: 2003;
Original page

Keywords: formaldehyde | acetaldehyde | propionaldehyde | electrooxidation | DSA®

This work describes the cyclic voltammetry study of three aliphatic aldehydes: formaldehyde, acetaldehyde and propionaldehyde at dimensionally stable anodes (DSA®). Electrodes of nominal composition Ti/Ru0.3M0.7O2 (where M = Ti ou Sn) were used in 0.5 mol dm-3 H2SO4 in a filter-press cell. Both electrodes exhibit behaviour typical of such materials in the presence of formaldehyde. However, with acetaldehyde and propionaldehyde non-typical behaviour is observed. This is characterised by a fall in the normalised faradaic anodic charge (q nf) and also a decrease in the current density associated with the oxygen evolution reaction (OER). A possible reaction mechanism, considering the direct oxidation of the aldehyde at the electrode surface, is suggested.
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