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Optimizing the Electrocatalytic Activity of Surface Confined Co Macrocyclics for the Electrooxidation of Thiocyanate at pH 4
Author(s) -
Sancy Mamie,
Pavez Jorge,
Gulppi Miguel A.,
de Mattos Ivanildo Luiz,
ArratiaPerez Ramiro,
LinaresFlores Cristian,
Paez Maritza,
Nyokong Tebello,
Zagal José H.
Publication year - 2011
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201000599
Subject(s) - thiocyanate , chemistry , inorganic chemistry , graphite , electrochemistry , electrocatalyst , catalysis , amperometry , redox , reactivity (psychology) , electrode , reaction rate constant , kinetics , organic chemistry , medicine , alternative medicine , pathology , physics , quantum mechanics
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 pH 4 exhibit linear amperometric response for thiocyanate concentration in the range 10 −7 and 10 −3 M. 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.
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