A parallel-plate electrochemical microreactor for the continuous production of hydrogen peroxide : research data underlying the article

Yordanova Apostolov, Desislava (author), Bardarov, Ivo (author), Tjell, Anders Ø. (author), Gričar, Ema (author), Starin, Mark (author), Farinazzo Bergamo Dias Martins, Pedro (author), Nosan, Miha (author), Mayr, Torsten (author), Strmčnik, Dušan (author), Plazl, Igor (author), Genorio, Boštjan (author)

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$_2$ electro- synthesis. 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 electro- chemical synthesis with reduced environmental impact and greater adaptability for modern industrial applications.

• Language: English
• Keywords: electrosynthesis, hydrogen peroxide, two-electron oxygen reduction reaction carbon electrocatalysts, electrochemical microreactor, continuous flow microreactor
• Typology: 2.20 - Complete scientific database of research data
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2026
• PID: 20.500.12556/RUL-181479
• Data col. methods: Measurements and tests

Note

Connected article/Povezan članek: Ivo Bardarov, Anders Ø. Tjell, Ema Gričar, Mark Starin, Pedro Farinazzo Bergamo Dias Martins, Miha Nosan, Torsten Mayr, Dušan Strmčnik, Igor Plazl, Boštjan Genorio. A parallel-plate electrochemical microreactor for the continuous production of hydrogen peroxide. Chemical engineering journal, vol. 525, 170301, 1 Dec. 2025, str. 1-11. https://doi.org/10.1016/j.cej.2025.170301.

• Publication date in RUL: 08.04.2026

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.