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Using an experimentally validated, flow\u2010direction\u2010resolved continuum model of a Cu\u2010based gas\u2010diffusion\u2010electrode (GDE) flow\u2010cell system, we demonstrate that gas\u2010fed  electrolysers behave as reacting\u2010flow electrochemical reactors in which electrochemical conversion transforms the gas phase in the cathode compartment and makes it part of the reactor response. As cathode potential becomes more negative,  consumption, CO formation and consumption, and gaseous product evolution progressively dilute the \u2010rich reacting gas phase, altering gas composition, density and velocity and feeding back into reactant delivery and intermediate availability. This reaction\u2010induced hydrodynamic response creates an operating window favoring ethylene formation and reveals a conservation\u2010driven feedback that becomes unavoidable during scale\u2010up: as electrode length, conversion and gaseous product formation increase, extended electrodes must preserve the spatial overlap between  delivery, CO generation, controlled CO consumption and limited dilution of the reacting gas\u00a0phase.<\/jats:p>","DOI":"10.1002\/advs.78274","type":"journal-article","created":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T03:41:47Z","timestamp":1792035707000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Product\u2010Reshaped Gas\u2010Phase Hydrodynamics Govern CO\n                    <sub>2<\/sub>\n                    Electrolysis in Gas Diffusion Electrodes"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-5252-0167","authenticated-orcid":false,"given":"Abdullah A.","family":"Alyahya","sequence":"first","affiliation":[{"name":"School of Engineering, Institute for Materials and Processes, Edinburgh Electrochemical Engineering Group (e3 Group) The University of Edinburgh Edinburgh United Kingdom"},{"name":"Centre of Excellence for Nanomaterials for Clean Energy Applications King Abdulaziz City for Science and Technology (KACST) Riyadh Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mayra S.","family":"Tovar\u2010Oliva","sequence":"additional","affiliation":[{"name":"School of Engineering, Institute for Materials and Processes, Edinburgh Electrochemical Engineering Group (e3 Group) The University of Edinburgh Edinburgh United 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