Synthesis of CuO/WO3/gC3N4 nanocomposite for the sensitive and selective electrochemical detection of H2O2

In this paper, we present, for the first time, research on a CuO/WO3/g-C3N4 nanocomposite for use as an electrochemical sensing material for hydrogen peroxide (H2O2). The crystal structure, the morphology, and the electrochemical properties are properly examined using numerous scientific tools that include infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Following systematic characterization, the CuO/WO3/g-C3N4 is employed to modify ITO electrodes for H2O2 concentration determination via cyclic voltammetry and amperometry techniques. The findings demonstrate that the dispersion of CuO and WO3 nanoparticle oxides on the g-C3N4 nanosheet surfaces effectively improves the electro-oxidation signal and the overall performance of the hybrid material. A linear relationship is observed between the peak current and the H2O2 concentration in the linear range of 0.5 to 1400 mu M. Based on the amperometric study, the modified hybrid electrode exhibits a high sensitivity of 1720 mu A center dot mM(-1)center dot cm(-2) with a low detection limit of 0.5 mu M. The selectivity and accuracy of the prepared material are also investigated. The constructed electrode has been successfully applied for testing H2O2 concentrations in real water samples. These combined results pave the way for the design of novel heterostructures for applications in environmental and health monitoring.