Oxygen reduction at polypyrrole electrodes—I. Theory and evaluation of the rrde experiments

The rotating ring-disc electrode ( rrde) is used to determine the heterogeneous reaction rate constants for the cathodic reduction of molecular oxygen at a polypyrrole electrode in 0.5 M H 2SO 4. During the rrde experiments, a substantial concentration of hydrogen peroxide is built up in the bulk el...

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Bibliographic Details
Published in:Electrochimica acta 1985, Vol.30 (8), p.1085-1091
Main Authors: Jakobs, R.C.M., Janssen, L.J.J., Barendrecht, E.
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:The rotating ring-disc electrode ( rrde) is used to determine the heterogeneous reaction rate constants for the cathodic reduction of molecular oxygen at a polypyrrole electrode in 0.5 M H 2SO 4. During the rrde experiments, a substantial concentration of hydrogen peroxide is built up in the bulk electrolyte. The theory is adapted to these circumstances and from the results, the various reaction rate constants are calculated. In the modified theory, the bulk peroxide is used to determine the activity of the ring electrode and it is possible to correct the ring current in situations where no diffusion limitation of the peroxide oxidation occurs.
ISSN:0013-4686
1873-3859
DOI:10.1016/0013-4686(85)80177-8