Electrochemical Detection of HO Using BiO/BiOSe Nanocomposites.

The development of high-performance hydrogen peroxide (HO) sensors is critical for various applications, including environmental monitoring, industrial processes, and biomedical diagnostics. This study explores the development of efficient and selective HO sensors based on bismuth oxide/bismuth oxyselenide (BiO/BiOSe) nanocomposites. The BiO/BiOSe nanocomposites were synthesized using a simple solution-processing method at room temperature, resulting in a unique heterostructure with remarkable electrochemical characteristics for HO detection. Characterization techniques, including powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM), confirmed the successful formation of the nanocomposites and their structural integrity. The synthesis time was varied to obtain the composites with different Se contents. The end goal was to obtain phase pure BiOSe. Electrochemical measurements revealed that the BiO/BiOSe composite formed under optimal synthesis conditions displayed high sensitivity (75.7 µA µM cm) and excellent selectivity towards HO detection, along with a wide linear detection range (0-15 µM). The superior performance is attributed to the synergistic effect between BiO and BiOSe, enhancing electron transfer and creating more active sites for HO oxidation. These findings suggest that BiO/BiOSe nanocomposites hold great potential as advanced HO sensors for practical applications.