20.500.12556/RUL-175775 A parallel-plate electrochemical microreactor for the continuous production of hydrogen peroxide This study presents a comprehensive evaluation of a microfluidic electrochemical system for the controlled generation and detection of hydrogen peroxide (H$_2$O$_2$). The integrated microreactor with a three-electrode configuration in combination with optical sensors enabled real-time monitoring of dissolved oxygen and H$_2$O$_2$ concentrations during chronoamperometric operation. Glassy carbon (GC) electrodes exhibited high selectivity toward the two-electron oxygen reduction reaction (2e$^−$ ORR), a key requirement for efficient H$_2$O$_2$ electrosynthesis. Cyclic voltammetry (CV), rotating ring-disk electrode (RRDE) analyses and electrochemical testing in real system identified 0.4 V vs. RHE as the optimal working potential. Flow rate experiments revealed a decline in H$_2$O$_2$ production with increasing flow rates, consistent with electrical charge measurements and oxygen consumption data. A mathematical model, validated with experimental data, reliably predicted H$_2$O$_2$ outlet concentration as a function of flow rate (residence time). The model captured the interplay between mass transport and surface electrocatalytic reactions and enabled the identification of an optimal operating window (25–50 μL min$^{−1}$), supporting model-based reaction optimization. Post-experiment surface characterization using SEM-EDS, XPS, and μ-FTIR revealed increased oxygen-containing functional groups on the GC working electrode, indicating surface oxidation that may enhance catalytic performance. Overall, this system offers a scalable, sustainable platform for on-demand H$_2$O$_2$ production, supporting cleaner, decentralized electrochemical synthesis with reduced environmental impact and greater adaptability for modern industrial applications. electrosynthesis hydrogen peroxide two-electron oxygen reduction reaction carbon electrocatalysts electrochemical microreactor continuous flow microreactor elektrosinteza vodikov peroksid dvoelektronska reakcija redukcije kisika ogljikovi elektrokatalizatorji elektrokemijski mikroreaktor pretočni mikroreaktor true false true Angleški jezik Slovenski jezik Članek v reviji 2025-11-07 10:12:51 2025-11-07 10:12:53 2026-06-17 04:10:52 0000-00-00 00:00:00 2025 0 0 11 str. Vol. 525, art. 170301 1 Dec. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 661.491.087 1385-8947 10.1016/j.cej.2025.170301 256282115 1-s2.0-S1385894725111455-main.pdf 1-s2.0-S1385894725111455-main.pdf 1 888FB01FB65A76A709A1CA2E3275D90D 1a4f81bcc93fbe4fee67f46afe988bdc68b96fda7feaf492cfc17242def8db59 b4ce94a2-697f-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=235740 https://www.sciencedirect.com/science/article/pii/S1385894725111455 1 9fa3796c-bbb9-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=221627 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0