Publication date: 22nd July 2026
Control of fundamental interfacial processes through electrode interface and microenvironment design is key to stable and scalable CO2 electrolyzers. In this presentation, I will report on recent advances in our design and understanding of cathode/catholyte and anode interfaces in efficient and scalable PTEFE-based one-gap as well as zero-gap CO2 electrolyzers. We will touch upon the opportunities and challenges associated with “zero-gap” vs “one-gap” cell designs based on the closed interconnection of ion and water movements across the membrane. Then, the surprising impact of the catholyte flow field design1 in one-gap cells on product efficiency will be addressed revealing the impact of interfacial flow velocity distributions. We will discuss a recent scalable hybrid catholyte flow field/current collector design2 for PTFE-based cathode interfaces for CO2 valorization into ethylene. Finally, we will give a comparative perspective on the design of AEM and BPM cell designs for zero-gap cells.3-5
References
- Filippi, M.; Möller, T.; Liang, L.; Strasser, P. Understanding the Impact of Catholyte Flow Compartment Design on the Efficiency of CO2 Electrolyzers. Energ Environ Sci 2023, 16, 5265-5273, 10.1039/D3EE02243A. DOI: 10.1039/D3EE02243A.
- Filippi, M.; Möller, T.; Pastusiak, R.; Magori, E.; Paul, B.; Strasser, P. Scale-Up of PTFE-Based Gas Diffusion Electrodes Using an Electrolyte-Integrated Polymer-Coated Current Collector Approach. Acs Energy Lett 2024, 1361-1368. DOI: 10.1021/acsenergylett.4c00114.
- Brückner, S.; Feng, Q.; Ju, W.; Galliani, D.; Testolin, A.; Klingenhof, M.; Ott, S.; Strasser, P. Design and diagnosis of high-performance CO2-to-CO electrolyzer cells. Nature Chemical Engineering 2024, 1 (3), 229-239. DOI: 10.1038/s44286-024-00035-3.
- Brückner, S.; Ju, W.; Strasser, P. Efficient Forward‐Bias Bipolar Membrane CO2 Electrolysis in Absence of Metal Cations. Advanced Energy Materials 2025, 15, 2500186. DOI: https://doi.org/10.1002/aenm.202500186.
- Brückner, S.; Bondarchuk, O.; Araújo, A.; Ju, W.; Cid, R.; Paz, E.; Krebs, F.; Soares, O.; Amorim, I.; Yu, Z. P.; et al. Failure mode diagnosis and stabilization of an efficient reverse-bias bipolar membrane CO2 to CO electrolyzer. Energy Environ Sci 2025, 18 (13), 6577-6586.
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