Rapid preparation of Ag/CoO/rGO composites for electrochemical detection of hydrogen peroxide

Hydrogen peroxide is a vital intermediate product in human metabolism and actively participates in numerous physiological processes. Its detection enables the monitoring of various physiological parameters relevant to conditions such as cancer, diabetes, and kidney failure. Consequently, the development of affordable, rapid, and highly sensitive hydrogen peroxide detection methods holds significant importance in the context of maintaining human health. This study employs a one-pot synthesis method to fabricate a screen-printed electrode (SPE) modified with Ag/CoO/rGO composite materials for the detection of H2O2. The structure and composition of Ag/CoO were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The electrochemical performance of the sensor was assessed utilizing electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and chronoamperometry (CA) techniques. Initially, we performed CA tests on screen-printed electrodes (SPEs) to detect H2O2, and the linear ranges of measurements were found to be 0.1-150 mu M and 100-600 mu M, with sensitivities of 391.8 and 514.1 mu A mM-1 cm-2, respectively. This non-enzyme-catalyzed H2O2 sensor exhibited excellent anti-interference properties and high selectivity, providing a new pathway for portable and rapid hydrogen peroxide detection devices. The preparation process of the Ag/CoO/rGO SPE was described, along with the material characterization and electrochemical performance using laser etching technology.