Electrochemical conversion of CO2 to formic acid under reduced CO2 concentration
Abstract
Electrochemical reduction of CO2 to formic acid has been attracting increasing interest in recent years due to the unique properties and potential applications of formic acid. Dioxide Materials has demonstrated the direct formation of formic acid in a 3-compartment CO2 electrolyzer with good performance. The electrolyzer was previously run with pure CO2. In the present work, the electrolyzer is operated with reduced CO2 concentration and the performance of electrolyzer is tested as a function of CO2 concentration. The testing results indicate decreased formic acid selectivity with reduced CO2 concentration. To improve the electrolyzer performance, a variety of strategies has been employed, including modification of electrolyzer design and components, adjustment of electrolyzer operation conditions. The electrolyzer performance (voltage, current, formic acid selectivity and production, and Faraday Efficiency) after modification has been evaluated and the results will be presented and discussed.
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