期刊
ACS CENTRAL SCIENCE
卷 8, 期 6, 页码 749-755出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscentsci.2c00329
关键词
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资金
- Natural Resources Canada [EIP2-MAT-001]
- Canadian Natural Science and Engineering Research Council [CRDPJ 536621-18]
- Canadian Foundation for Innovation [229288]
- Canadian Institute for Advanced Research [BSE-BERL-162173]
- TOTAL American Services, Inc. (an affiliate of TotalEnergies SE, France)
- Canada Research Chairs
- Canada First Research Excellence Fund, Quantum Materials and Future Technologies Program
An electrolyzer capable of reducing CO2 into CO at a high rate and efficiency is developed by using a reactive carbon solution, a cation exchange membrane, and the hydrogen oxidation reaction. This study highlights the importance of feedstock, membrane, and anode chemistries in converting CO2 into products.
Electrolyzers are now capable of reducing carbon dioxide (CO2) into products at high reaction rates but are often characterized by low energy efficiencies and low CO2 utilization efficiencies. We report here an electrolyzer that reduces 3.0 M KHCO3(aq) into CO(g) at a high rate (partial current density for CO of 220 mA cm-2) and a CO2 utilization efficiency of 40%, at a voltage of merely 2.3 V. These results were made possible by using: (i) a reactive carbon solution enriched in KHCO3 as the feedstock instead of gaseous CO2; (ii) a cation exchange membrane instead of an anion exchange membrane, which is common to the field; and (iii) the hydrogen oxidation reaction (HOR) at the anode instead of the oxygen evolution reaction (OER). The voltage reported here is the lowest reported for any CO2 to CO electrolyzer that operates at high current densities (i.e., a partial current density for CO greater than 200 mA cm-2) with a CO2 utilization efficiency of greater than 20%. This study highlights how the choice of feedstock, membrane, and anode chemistries affects the rate and efficiency at which CO2 is converted into products.
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