Benchmarking anion-exchange membranes for electrocatalytic carbon monoxide reduction

Performing carbon monoxide reduction in membrane electrode assembly configuration (MEA) is critical to achieving a high reaction rate while reducing cell resistance. Most studies examine the role of the cathode on product selectivity and cell stability, and comparatively little attention has been given to the membrane impact on cell performance. This study demonstrates that membrane properties such as water uptake, ion-exchange capacity, and functional groups alter the liquid product selectivity. Interestingly, we show that high ethanol crossover in conjunction with a suitable anode (NiFeOx) tunes the acetate selectivity. Overall, membrane properties significantly affect cell stability and product selectivity in a membrane electrode assembly configuration.