Non-enzymatic electrochemical sensors for the detection of hydrogen peroxide based on Cu2O/Cu nanocomposites

Abstract

In this article, Cu₂O/Cu NC nanocomposite catalysts on glass carbon electrodes have been synthesized by electrochemical deposition at −0.2 V versus silver/silver chloride and used to construct an electrochemical sensor for detection of hydrogen peroxide. The effects of deposition time and pH were investigated in detail. In 0.1 M phosphate buffer saline (PBS, pH = 6.5), the Cu₂O/Cu NC modified electrode exhibits a wide linear dependence (R = 0.996) at a concentration of H₂O₂ from 4.0 × 10⁻⁷ M to 1.0 × 10⁻² M, a high sensitivity of 870.4 μA mM⁻¹ cm⁻² and a detection limit of 2.0 × 10⁻⁷ M. Additionally, the sensor was applied for the determination of H₂O₂ in milk, showing its potential for practical applications.