Electrochemical Analysis of H2O2 and Nitrite Using Copper Nanoparticles/Poly(o-phenylenediamine) Film Modified Glassy Carbon Electrode

Abstract

Copper nanoparticles (Cu-NPs) have been electrochemically synthesized onto a poly(-phenylenediamine) (PoPD-) coated glassy carbon electrode (GCE). Electrochemical properties and surface characterizations were studied using cyclic voltammetry, atomic force microscopy (AFM), scanning electron microscopy (SEM), and X-ray diffraction (XRD) analysis. Cyclic voltammetry, AFM, SEM, and XRD confirmed the presence of Cu-NPs on the electrode surface. Cu-NPs are firmly stabilized by surface attachment of the PoPD functionality that can be attached to the electrode surface, thus becoming an integral part of the polymer backbone. The Cu-NPs–polymer film-coated GCE (Cu-NPs/PoPD/GCE) showed excellent electrocatalytic activity toward the reduction of hydrogen peroxide and nitrite . Amperometry was carried out to determine the concentration of and at −0.3 V. The dependence of the current response on the concentration was explored under neutral conditions, and an excellent linear concentration range from to was found. The Cu-NPs/PoPD/GCE allows highly sensitive, low working potential, stable, and fast amperometric sensing of and . This is promising for the future development of nonenzymatic sensors. The real-sample analysis of commercial samples was performed using the proposed method, and the obtained results are satisfactory.