Optimizing the Electrocatalytic Activity of Surface Confined Co Macrocyclics for the Electrooxidation of Thiocyanate at pH4

We have studied the trends in catalytic activity of several Co macrocyclics confined on the surface graphite electrodes for the oxidation of thiocyanate. A plot of log i (at constant E) versus the formal potential of the catalyst gives a volcano correlation, indicating that the Co(II/I) redox potent...

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Bibliographic Details
Published in:Electroanalysis (New York, N.Y.) N.Y.), 2011-03, Vol.23 (3), p.711-718
Main Authors: Sancy, Mamie, Pavez, Jorge, Gulppi, Miguel A, deMattos, Ivanildo Luiz, Arratia-Perez, Ramiro, Linares-Flores, Cristian, Paez, Maritza, Nyokong, Tebello, Zagal, Jose H
Format: Article
Language:English
Subjects:
Anodizing
Correlation
Electrodes
Graphite
Macrocyclic compounds
Mathematical analysis
Optimization
Surface chemistry
Thiocyanates
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Summary:We have studied the trends in catalytic activity of several Co macrocyclics confined on the surface graphite electrodes for the oxidation of thiocyanate. A plot of log i (at constant E) versus the formal potential of the catalyst gives a volcano correlation, indicating that the Co(II/I) redox potential needs to be tuned, in order to achieve maximum reactivity. Graphite electrodes modified with Co phthalocyanine at pH4 exhibit linear amperometric response for thiocyanate concentration in the range 10-7 and 10-3M. Theoretical calculations show that electrocatalytic activity (as log i at constant E) plotted versus the energy of the LUMO of the Co complex also gives a volcano correlation.
ISSN:1521-4109
DOI:10.1002/elan.201000599