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

Autor(es)

Geoffroy R. P. Malpass ^[1] ; Artur J. Motheo ^[2]

Afiliação do(s) autor(es)

^[1] Universidade de São Paulo. Instituto de Química de São Carlos - Brasil

^[2] Universidade de São Paulo. Instituto de Química de São Carlos - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 14, n. 4, p. 645-650, 2003-08-00.

Resumo

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. (AU)

• Processo FAPESP: 99/07599-6 - Eletroxidação de aldeídos sobre ânodos do tipo dimensionalmente estáveis
• Beneficiário: Geoffroy Roger Pointer Malpass
• Modalidade de apoio: Bolsas no Brasil - Doutorado