Reviewing anion exchange membrane (AEM) development for CO2 electrolyzers
A broad group of experts in the field provide an excellent review published in Nature Energy on the potential, recent advances, and future recommendations of the design of AEMs for mediating the electrochemical CO2 reduction. The underlying goal is to enable CO2 reduction reaction at low cell voltages whilst maintaining high conversion efficiencies. Anion exchange membranes (AEMs) in zero-gap reactors offer promise in this direction.
There remain substantial obstacles to be overcome in tailoring the membranes and other cell components and the paper also provides an excellent discussion on them. The authors also provide a discussion on existing commercial AEM options among which Sustainion membranes are touted for providing commercially relevant current densities (200 mA cm–2) and sustaining >95% CO selectivity at 3 V for long term studies (3,800 h).
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