Graphite Electrode Modified by Poly(Methylene Blue) and its Electrocatalytic Activity towards Hydrogen Sulfide Oxidation

Abstract

This research is focused on the electrochemical synthesis and characterization of poly(methylene blue) (pMB). Two different carbon-based electrode substrates, basal plane highly oriented pyrolytic graphite (HOPG) and pencil graphite electrode (PGE), have been modified by conductive film of pMB.

Electrochemical properties and nanomorphological changes have been investigated by cyclic voltammetry and atomic force microscopy. Improved electroactivity of the modified electrodes (PGE/pMB and HOPG/pMB) towards sulfhydryl group has been observed and examined modified electrodes were researched for their possible application in electrochemical sensor for hydrogen sulfide in aqueous solutions.

Keywords

• atomic force misroscopy
• cyclic voltammetry
• electropolymerization
• HOPG hydrogen sulfide
• poly(methylene blue)
• PGE
• potentiommetry.