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

Copper nanoparticles (Cu-NPs) have been electrochemically synthesized onto a poly(o-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 (H 2 O 2 ) and nitrite (NO ― 2 ). Amperometry was carried out to determine the concentration of H 2 O 2 and NO ― 2 at ―0.3 V. The dependence of the current response on the H 2 O 2 concentration was explored under neutral conditions, and an excellent linear concentration range from 1.0 × 10 ―6 to 1.0 × 10 ―3 M was found. The Cu-NPs/PoPD/GCE allows highly sensitive, low working potential, stable, and fast amperometric sensing of H 2 O 2 and NO ― 2 . This is promising for the future development of nonenzymatic sensors. The real-sample analysis of commercial H 2 O 2 samples was performed using the proposed method, and the obtained results are satisfactory.

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