Comparative study of the electrocatalytic activity of cobalt phthalocyanine and cobalt naphthalocyanine for the reduction of oxygen and the oxidation of hydrazine

Cobalt phthalocyanine (CoPc) and cobalt naphthalocyanine (CoNPc) exhibit different redox and electronic properties. Redox processes on CoPc are more reversible than on CoNPc. The pH dependence of those processes is also different for these complexes, which could indicate that in the case of CoNPc, t...

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Bibliographic Details
Published in:Electrochimica acta 1998-01, Vol.43 (12), p.1821-1827
Main Authors: Isaacs, M., Aguirre, M.J., Toro-Labbé, A., Costamagna, J., Páez, M., Zagal, J.H.
Format: Article
Language:English
Subjects:
Chemistry
cobalt naphthalocyanine
cobalt phthalocyanine
electrocatalysis
Electrochemistry
Exact sciences and technology
General and physical chemistry
hydrazine
Kinetics and mechanism of reactions
O 2 reduction
oxidization
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Summary:Cobalt phthalocyanine (CoPc) and cobalt naphthalocyanine (CoNPc) exhibit different redox and electronic properties. Redox processes on CoPc are more reversible than on CoNPc. The pH dependence of those processes is also different for these complexes, which could indicate that in the case of CoNPc, the redox couples observed involve the macrocyclic ligand and not the metal as with CoPc. This seems to explain the different redox properties and kinetics for O 2 reduction and N 2H 4 oxidation of these two macrocyclics. In this study we compare the electrocatalytic activity of these two phthalocyanines, adsorbed on glassy carbon, for the electrochemical reduction of O 2 and for the oxidation of hydrazine.
ISSN:0013-4686
1873-3859
DOI:10.1016/S0013-4686(97)00314-9