Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.042
Publication date: 11th July 2022
Carbon dioxide (CO2) capture and electrolysis is a promising route to produce valuable chemicals from CO2. Coupling the capture and electrolysis has the potential to intensify the process and reduce the overall energy cost. Taking amine scrubbing process as an example, the CO2 electrolysis can displace the energy-intensive amine recovery of the capture and produce valuable chemicals (e.g., carbon monoxide, CO) to offset the overall carbon abatement cost. Our recent process modelling results[1] found that the integrated route could save up to 42% overall energy if the integrated electrolysers perform similarly to the state-of-the-art gas-fed electrolyser.
However, the reported integrated electrolysers show inferior performance to the gas-fed electrolysers. Understanding the catalytically active species for CO2 conversion in the capture media is essential to rationally design an efficient integrated electrolysis system, but remains underexplored. This talk aims to uncover the dominant active species for the CO2 conversion to CO in a commonly studied ethanolmaine aqueous capture medium from our recent experimental findings. We will first discuss the potential CO2-related species available in the amines. The following part will show how the chemical species can change locally under CO2 electrochemical conditioning, and discuss their role in determining CO2-to-CO conversion efficiency. This talk will conclude with potential research directions that can further boost the performance of the integrated electrolysis.
T.B. and M.L. would like to acknowledge the European Union’s Horizon 2020 research and innovation program under grant agreement No. 85144 (SELECT-CO2). T.B. would also like to acknowledge the NWO for an individual Veni grant.
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