Previous works has shown that CO2 electrolyzers using Sustainion® anion exchange membranes can produce CO at industriallyt relevant currrents at 3.3V or below. When pure CO2 is fed into the cell, the cell can run up to 4000 hrs with &gt;95% faradaic efficiency and negligible degradation. The objective of the work reported here is to determine how the cells perform when dilute CO2, such as that from flue gas is fed into the cell. Initial work shows that the selectivity decreases when the CO2 is diluted, due to reduced mass transfer to the electrode. In this talk, we will present some results with CO2-rich flue gas rather than pure CO2 and discuss the effect of CO2 concentration and impurities in flue gas on CO2 electrolysis.

Effect of CO2 concentration on the electrolytic conversion of CO2 to CO

2019 Spring National Meeting

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