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.File | Dimensione | Formato | |
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Article CO2 Electroreduction to Multicarbon Products from Carbonate Capture Liquid_Joule.pdf
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