Abstract: A membrane electrode assembly for an electrochemical cell, in particular a co-electrolysis cell for CO2 reduction reaction, can overcome the problem of parasitic CO2 pumping from cathode to anode side and, at the same time, maintain good Faradaic efficiency towards CO2 reduction reaction in a co-electrolysis system where pure or diluted gaseous CO2 is used. The assembly includes an MEA, having an anode, a cathode, a polymer ion exchange membrane between cathode and anode, an additional ion exchange polymer film between the cathode and the polymer ion exchange membrane and a discontinuous interface formed between the additional polymer film located at the cathode side and the ion exchange membrane.