Electronic Control of pH at Sulfonated Polyaniline Electrodes.

摘要

The pH of aqueous solutions in the vicinity of a thin self-doped conducting polyaniline electrode was electrochemically modulated using both cyclic voltammetry and step potential techniques. Changes in pH were measured directly by using a microcombination pH probe. The experimental results demonstrate that the polymer behaves as a proton ejector during oxidation and a proton absorber during reduction. This potential-controlled pH change near the polymer coated electrode may be applied to many fields benefitting from electronic control of the proton environment near an electrode surface, for example, control of enzyme activity.