Multiparametric, Spatially Resolved Detection of H2O2 and O2 with Electrochemical Microsensor Array in Synthesis Membrane Microreactors

We present an electrochemical microsensor system for the multiparametric detection of dissolved concentrations of hydrogen peroxide (H2O2) and oxygen (O2) inside a direct synthesis membrane microreactor. Both reactants are detected with high sensitivity on the same Pt-based electrode by changing the applied measurement potential in a chronoamperometric protocol. The robust integration of the electrochemical cell in the microreactor was demonstrated and allowed for in situ detection of the spatial gradient of the changing oxygen concentration diffusing through a membrane into the microreactor, emphasizing the capabilities of our monitoring system.