Abstract
Renewably powered CO2 electrocatalysis presents an opportunity to de-carbonize fuel and chemical production. Commercial application of CO2 reduction will require electrocatalytic systems that provide reactants, electrons, and products at high rate and efficiency, and that are compatible with established upstream and downstream processes. I will outline our progress on membrane electrode assembly based cells to meet this challenge. To accommodate O2 impurities from upstream processes we develop a hydrated ionomer catalyst coating that selectively slows O2 transport and stabilizes the copper catalyst. To increase reaction rate and energy efficiency we develop an adlayer catalyst strategy that increases local CO2 availability and tunes intermediate adsorption for ethylene production. For ethanol production we focus on minimizing product cross-over to the anode, targeting ethanol production in excess of the 10wt% - comparable to bio-ethanol production and compatible with downstream processes. I will highlight learnings, challenges and opportunities arising from scaling our membrane electrode assembly based cells in a pilot plant.
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