Symmetry factor and transfer coefficient in analysis of enthalpies of activation and mechanisms of oxygen reduction at platinum electrodes

Oxygen reduction at Pt electrodes is characterized by two linear E-log i regions. Tafel slopes of - RT/β F in the high current density ( cd) region and of - RT/α F in the low cd region increase with temperature as predicted for the temperature independent symmetry factor β(=1/2) and transfer coeffic...

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Bibliographic Details
Published in:Electrochimica acta 1986-11, Vol.31 (11), p.1401-1402
Main Authors: Sepa, D.B., Vracar, L.M., Vojnovic, M.V., Damjanovic, A.
Format: Article
Language:English
Subjects:
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
Kinetics and mechanism of reactions
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Summary:Oxygen reduction at Pt electrodes is characterized by two linear E-log i regions. Tafel slopes of - RT/β F in the high current density ( cd) region and of - RT/α F in the low cd region increase with temperature as predicted for the temperature independent symmetry factor β(=1/2) and transfer coefficient α(=1). Enthalpies of activation based on these data support the conclusion that in both cd regions the first electron transfer step is rate determining irrespective of the difference in the Tafel slopes.
ISSN:0013-4686
1873-3859
DOI:10.1016/0013-4686(86)87051-7