In Situ Mapping of H2, O2, and H2O2 in Microreactors: A Parallel, Selective Multianalyte Detection Method

• DOI: 10.1021/acssensors.0c02509
• Publication Date: 2021-01-23T05:22:57Z
• Authors: Sebastian Urban; Benedikt J. Deschner; Laura L. Trinkies; Jochen Kieninger; Manfred Kraut; Roland Dittmeyer; Gerald A. Urban; Andreas Weltin
• Keywords: Microreactor

Determining local concentrations of the analytes in state-of-the-art microreactors is essential for development optimized and safe processes. However, selective, parallel monitoring all relevant reactants products a multianalyte environment challenging. Electrochemical microsensors can provide unique information on reaction kinetics overall performance hydrogen peroxide synthesis process microreactors, thanks to their high spatial temporal resolution ability measure situ, contrast other techniques. We present chronoamperometric approach which allows selective detection dissolved gases oxygen product same platinum microelectrode an aqueous electrolyte. The method enables us obtain concentration each analyte using three specific potentials subtract interfering currents from mixed signal. While be detected independently, no found direct, measurement peroxide. Instead, it was that combined signals, individual contribution superimposes linearly additive. showed determined subtracted signals correlate very well with results obtained without present. For first time, this allowed mapping distribution hydrogen, oxygen, inside multiphase membrane microreactor, paving way online control.