Hydrogen peroxide (H$_2$O$_2$) is a strong liquid oxidant that plays an important role in sustainable industrial oxidation processes such as wastewater treatment, industrial bleaching, chemical synthesis, and medical disinfection. Due to its high demand in industry, its production and detection are of crucial importance. One of the most effective detection methods includes electrochemical sensors, which show particularly promising results when made from nanomaterials such as graphene and borophene. Electrochemical sensors in a batch system operate within a three-electrode system and vary based on the preparation and modification of the working electrode, with an emphasis on the difference in performance between disc and screen-printed electrodes, especially in terms of sensitivity, stability and efficiency. For industrial applications , the transition from batch to flow reactors is crucial. In this context, real-time monitoring and measurement of analytes concentrations within the system are of utmost importance. For the electrochemical production of H$_2$O$_2$ through the oxygen reduction reaction in a flow system, an optical sensor is usually used for its real-time detection.
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