BiOCl–CuO nanocomposite as a bifunctional material for glucose detection and energy storage

A BiOCl–CuO (BCC) nanocomposite was synthesized via a solvothermal method and characterized for its dual electrochemical applications in glucose sensing and supercapacitors. High-resolution scanning electron microscopy (HR-SEM) revealed a nanosphere morphology, while electrochemical impedance spectroscopy (EIS) and Brunauer–Emmett–Teller (BET) analysis demonstrated a low charge transfer resistance (6.95 Ω) and a high specific surface area (124.5 m²/g), respectively. The synergistic interaction between BiOCl and CuO enhanced glucose adsorption and oxidation, yielding a sensitivity of 0.718 mA mM⁻¹ cm⁻² and a detection limit of 0.48 mM, as determined by chronoamperometry. In supercapacitor applications, BCC exhibited superior electrochemical performance compared to pure BiOCl, with a higher specific capacitance of 684.92 Fg⁻¹, prolonged discharge time, and excellent cycling stability. These findings highlight the potential of BCC as a multifunctional material for high-performance glucose sensors and energy storage devices.