Abstract
A room-temperature zero-gap, KOH anolyte CO2 electrolyzer demonstrating 40% energetic conversion efficiency (EE) for CO2 to CO using AEMION anion-exchange membranes is achieved at an industrially relevant current density of 200 mA cm–2. The concentration and volume of the anolyte are found to be critical to the determination of EE as carbonate ion crossover is shown to cause a significant increase in ECell during continuous operation. Using thicker and/or lower ion-exchange capacity variant membranes results in an approximately 20% reduction in carbonate ion crossover, which is critical for the economic viability of direct CO2 electrolysis systems. It is proposed that future membrane designs must reduce carbonate crossover without compromising the electrolyzer efficiency and stability.
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