We devised a trilayer polymer electrolyte comprising a perforated anion exchange membrane and a bipolar membrane to facilitate alkaline CO2 electroreduction. This trilayer polymer electrolyte enables the coexistence of high alkalinity near the catalyst surface and the H+ flux at the interface between the perforated anion exchange membrane and the cation exchange layer of the bipolar membrane, conditions favoring both CO2 reduction to multicarbon products and (bi)carbonate removal in KOH-fed membrane electrode assembly reactors. Read the full paper in Angew. Chem.
