Nonenzymatic Electrochemical Sensors for Hydrogen Peroxide Using a Cu-TCPP/rGO Nanocomposite

Nonenzymatic electrochemical methods offer significant advantages for hydrogen peroxide (H2O2) detection. However, the sensitivity must be improved for practical applications. In this study, we developed a novel electrochemical sensor for H2O2 based on a Cu-TCPP/reduced graphene oxide (rGO) nanocomposite synthesized via a surfactant-assisted method. Comprehensive structural and morphological analyses, including TEM, SEM, EDS, XRD, UV–vis, and FTIR, demonstrated uniform dispersion of Cu-TCPP on the rGO surface via π–π interactions. Electrocatalytic reduction of H2O2 at the Cu-TCPP/rGO-modified electrode showed a linear range of 0.10–6.30 mM and a detection limit of 0.03 mM (S/N = 3). The practical applicability of the sensor was demonstrated by the detection of H2O2 in commercial disinfectant samples, yielding recovery rates in the range of 99.7–104.0%. These results highlight the capabilities of Cu-TCPP/rGO nanocomposites as reliable platforms for the sensitive, nonenzymatic electrochemical detection of H2O2, making them a valuable potential tool for environmental monitoring.