Electrochemical CO2 capture is rapidly emerging as a next generation technology for mitigating greenhouse gas emissions. In this presentation I will review recent progress from our research group on understanding and improving electrochemical CO2 capture by (i) carbon-based supercapacitors, and (ii) quinone-based batteries. Carbon-based supercapacitors benefit from their simplicity and sustainable materials, but a major challenge is to increase electrochemical CO2 capture capacities, which currently lag far behind those of quinone systems. I will show that by varying the charging protocol, CO2 capacity increases can be obtained.1 At the same time, our measurements provide new insights into the molecular mechanisms of electrochemical capture which may aid the design of improved systems.1 Secondly, for the case of quinone-based batteries, a major pratical limitation is oxygen sensitivity. It has been proposed that this issue can be overcome by tuning the quinone chemistry, but we show that there exists a trade off between redox potential and CO2 capture strength.2 I will outline potential strategies to overcome performance trade-offs in electrochemical CO2 capture.

Understanding electrochemical carbon dioxide capture in supercapacitors and quinone-based batteries.

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ACS Fall 2022

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