Construction of a non-enzymatic electrochemical sensor based on CuO/g-C3N4 composite for selective detection of hydrogen peroxide

Highlights: • CuO/g-C₃N₄ composite was prepared via hydrothermal method and characterized. • CuO/g-C₃N₄ composite was dropped on GCE for electrochemical behaviors. • The detection of H₂O₂ was investigated by using CuO/g-C₃N₄/GCE. • The CuO/g-C₃N₄/GCE demonstrated a good activity and the detection limit was 0.31 μM of H₂O₂. The detection of hydrogen peroxide is very important in terms of hydrogen peroxide in biological systems. Therefore, the development of efficient electrochemical hydrogen peroxide sensors is of great interest by researchers. In this research, a CuO/g-C₃N₄ electrochemical sensor on a glassy carbon electrode was prepared and investigated for hydrogen peroxide detection. Firstly, CuO/g-C₃N₄ composite was synthesized via hydrothermal method and characterized. Secondly, the CuO/g-C₃N₄ composite was fabricated on glassy carbon electrodes for electrochemical measurements such as cyclic voltammetry and electrochemical impedance spectroscopy. Finally, the electrochemical behavior of the CuO/g-C₃N₄ on a glassy carbon electrode towards hydrogen peroxide was evaluated using differential pulse voltammetry. The obtained sensor exhibited a linear response for hydrogen peroxide detection in the range of 0.5–50 μM and the detection limit was found as 0.31 μM. In addition, the prepared electrode was also plausibly utilized for the determination of hydrogen peroxide in makeup remover as a real sample. This study highlights the CuO/g-C₃N₄ composite for electrochemical hydrogen peroxide detection.