Study of the preparation and electrochemical properties of cobalt(II) methyl pyridyl porphyrin adsorbed on the SiO2/TiO2/Sb2O5 matrix prepared by sol-gel method

摘要

This work describes the use of the mixed oxide SiO2/TiO2/Sb2O5 (STSb) prepared by the sol-gel processing method. The material had an ion exchanger capacity of 2.0 mmol g(-1) and was used to absorb a Co(H) methyl-pyridyl-porphyrin complex (CoTmPyP) by an ion exchange reaction. The resulting material, STSb/CoTmPyP, showed a specific surface area of 554 m(2) g(-1) and 84 mu mol g(-1) of adsorbed cobalt complex. A carbon paste electrode made with STSb/CoTmPyP showed that, in a cyclic voltammetry experiment, it can electrocatalytically reduce dissolved oxygen in water solution (pH between 3 and 6.8) under a cathodic potential of -170 mV. The electrode showed a linear response for dissolved O-2 concentration in water between I and 10.1 ppm. [References: 26]