Hydrogen peroxide is an important analyte in analytical chemistry because of its presence in both textile and paper industries, as well as in healthcare and households due to antimicrobial properties. As a strong oxidant, it requires precise concentration regulation in all processes, making accurate and reliable determination of hydrogen peroxide very important. Due to their high sensitivity and simplicity, electrochemical methods, especially amperometric sensors, have proven to be very effective. The use of nanoparticles, such as metal oxides and graphene nanomaterials, further enhances the efficiency of these sensors. Nanoparticles increase the surface activity of the electrodes, improve conductivity, and enable faster electron transfer, leading to higher sensitivity and precision in the analysis of hydrogen peroxide.
In this work, I focused on modifications of screen-printed electrodes (SPE) for the analysis of hydrogen peroxide. Through measurements, I studied the response of the SPE electrode in various solutions. I modified the surface of the working electrode with turbostratic graphene, obtained through flash Joule heating, to increase the electrode surface area and improve electrochemical properties, and with manganese dioxide, which acts as a catalyst for the decomposition of hydrogen peroxide. I chose the best modification and determined the most suitable solution for determination of hydrogen peroxide in a real sample. I examined the linear range of electrode, the limit of detection (LOD), the reproducibility, and lifetime of electrodes. The method was successfully validated by analyzing a real hydrogen peroxide sample.
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