Abstract

Iron (II) tetrasulphophthalocyanine complex was adsorbed on a 3- n-propylpyridinium chloride functionalized silica gel surface by means an ion exchange reaction. The amount of the complex bonded to the substrate surface, by electrostatic interaction, is 25 μmol g −1 and the specific surface area S BET=320 m 2 g −1. A carbon paste electrode made with the material can electrocatalytically reduce dissolved oxygen to water at a potential Ep c=−140 mV in 0.5 M KCl solution. The plot of the cathodic current against dissolved oxygen concentrations between 0.65 and 14.4 mg dm −3 showed a linear correlation at 298 K and pH 5. The electrode presented a reproducible response and chemically it was stable under various oxidation–reduction cycles.

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