Alkali hydroxide systems capture CO 2 as carbonate; however, generating a pure CO 2 stream requires significant energy input, typically from thermal cycling to 900 C. What is more, the subse- quent valorization of gas-phase CO 2 into products presents addi- tional energy requirements and system complexities, including man- aging the formation of (bi)carbonate in an electrolyte and separating unreacted CO 2 downstream. Here, we report the direct electrochemical conversion of CO 2 , captured in the form of carbon- ate, into multicarbon (C 2+ ) products. Using an interposer and a Cu/ CoPc-CNTs electrocatalyst, we achieve 47% C 2+ Faradaic efficiency at 300 mA cm 2 and a full cell voltage of 4.1 V. We report 56 wt % of C 2 H 4 and no detectable C 1 gas in the product gas stream: CO, CH 4 , and CO 2 combined total below 0.9 wt % (0.1 vol %). This approach obviates the need for energy to regenerate lost CO 2 , an issue seen in prior CO 2 -to-C 2+ reports.

CO2 electroreduction to multicarbon products from carbonate capture liquid / G. Lee, A.S. Rasouli, B. Lee, J. Zhang, D.H. Won, Y.C. Xiao, J.P. Edwards, M.G. Lee, E.D. Jung, F. Arabyarmohammadi, H. Liu, I. Grigioni, J. Abed, T. Alkayyali, S. Liu, K. Xie, R.K. Miao, S. Park, R. Dorakhan, Y. Zhao, C.P. O’Brien, Z. Chen, D. Sinton, E. Sargent. - 7:(2023), pp. 1-12. [10.1016/j.joule.2023.05.003]

CO2 electroreduction to multicarbon products from carbonate capture liquid

I. Grigioni;
2023

Abstract

Alkali hydroxide systems capture CO 2 as carbonate; however, generating a pure CO 2 stream requires significant energy input, typically from thermal cycling to 900 C. What is more, the subse- quent valorization of gas-phase CO 2 into products presents addi- tional energy requirements and system complexities, including man- aging the formation of (bi)carbonate in an electrolyte and separating unreacted CO 2 downstream. Here, we report the direct electrochemical conversion of CO 2 , captured in the form of carbon- ate, into multicarbon (C 2+ ) products. Using an interposer and a Cu/ CoPc-CNTs electrocatalyst, we achieve 47% C 2+ Faradaic efficiency at 300 mA cm 2 and a full cell voltage of 4.1 V. We report 56 wt % of C 2 H 4 and no detectable C 1 gas in the product gas stream: CO, CH 4 , and CO 2 combined total below 0.9 wt % (0.1 vol %). This approach obviates the need for energy to regenerate lost CO 2 , an issue seen in prior CO 2 -to-C 2+ reports.
Decabonization; Carbon dioxide reduction; carbon capture; carbon utilization; electrocatalysis; CO2RR; catalysis
Settore CHIM/02 - Chimica Fisica
Settore CHIM/04 - Chimica Industriale
2023
26-mag-2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/972941
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