Composite Materials Based on Prussian Blue Nanopartides and Polypyrrole for Design of a Highly Stable Sensor for Hydrogen Peroxide

摘要

A redox process in a mixed solution of iron(III) hexacyanoferrate(III) and pyrrole with a chloride or nitrate supporting electrolyte resulted in Prussian Blue-polypyrrole composite materials. Transmission electron microscopy (TEM) demonstrated that the synthesized composites are composed of Prussian Blue nanopartides distributed inside polypyrrole globules. The morphology of the resulting composite films turned out to depend on the composition of the supporting electrolyte. It was studied whether the prepared composite can be used as an electrocatalyst of hydrogen peroxide reduction in weak acid media (pH 6). It was shown that the preparation of the composite in nitrate media leads to formation of high-quality electrocatalyst films suitable for creation of a highly stable sensor for hydrogen peroxide retaining its activity under severe conditions of continuous monitoring of 1 mM H2O, for 150-160 min, which is 80 times longer than the stable response time of electrodes modified with pure Prussian Blue.