Impedance study of methanol oxidation on platinum electrodes
2006; Elsevier BV; Volume: 51; Issue: 18 Linguagem: Inglês
10.1016/j.electacta.2005.10.050
ISSN1873-3859
AutoresFrode Seland, Reidar Tunold, David A. Harrington,
Tópico(s)Corrosion Behavior and Inhibition
ResumoMethanol oxidation on Pt electrodes is studied by ac voltammetry. Data from voltammograms at frequencies from 0.5 Hz to 20 kHz are assembled into electrochemical impedance spectra and analysed using equivalent circuits. Inductive behavior and negative relaxation times are attributed to nucleation and growth behavior. The rate-determining step is proposed to be the reaction of adsorbed CO and OH at the edge of islands of OH, with competition between OH and CO adsorption for the released reaction sites.
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