Abstract
Developments in polymer alkaline anion exchange membranes have led to their recent successful implementation in new and exciting electrochemical applications. Historically, the use of carbon dioxide in alkaline cells plagued performance through carbonate precipitation from the electrolyte on the electrodes. However, anion exchange membranes have allowed for the transport of carbonate and bicarbonate species without carbonate precipitation. This results in a mixed anionic conductivity, presenting new applications for their use in low temperature electrochemical reactions. For example, carbon dioxide can be separated and compressed from a gas stream in electrolysis (pumping) mode. Fuel cells that tolerate reduction of atmospheric air at the cathode and other oxidative conversions at the anode could also be feasible. Therefore, exploring the transport properties of bi/carbonate cells under differing half-reactions can elucidate limitations and possibilities for future use.
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