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Optimizing CO2-Loaded Aqueous Amine Solutions for Higher Electrocatalytic CO2 Reduction Activity.
Ab Qayoom Mir1, Avishek Banerjee2, Ferdawss Ihiri3
1Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States.
Adding specific amines significantly boosts aqueous carbon dioxide reduction (CO2R) to carbon monoxide (CO) activity. The enhancement depends on amine properties like basicity and structure, not just one factor.
Area of Science:
- Electrochemistry
- Catalysis
- Green Chemistry
Background:
- Aqueous carbon dioxide reduction (CO2R) is crucial for converting CO2 into valuable products.
- CO2 solubility in water often limits reaction rates and efficiency.
- Amines can enhance CO2 solubility and speciation, potentially improving CO2R.
Purpose of the Study:
- Investigate the impact of various amine properties on aqueous CO2R to CO activity.
- Identify key amine characteristics that enhance catalyst performance.
- Understand the mechanism by which amines influence CO2R.
Main Methods:
- Employed a molecular Ni(cyclam)Cl2 catalyst with a Hg electrode for CO2R.
- Tested 12 primary and secondary amines with diverse properties (basicity, sterics, H-bonding).
- Utilized vapor-liquid equilibrium modeling, 13C NMR, and computational analysis for speciation studies.
Main Results:
- Certain amines increased CO2R activity and CO selectivity compared to amine-free solutions.
- Optimal conditions (0.4 M 3-amino-propionitrile) yielded a sevenfold increase in partial current density.
- Activity enhancement correlated with carbamate concentration for non-hydroxyethyl amines, influenced by basicity and sterics.
Conclusions:
- Amine additives can significantly enhance aqueous CO2R activity and selectivity.
- Amine properties like basicity, sterics, and hydrogen-bonding capabilities are critical for performance.
- The presence of ethylalcohol functionalities in amines can alter the structure-activity relationship due to intramolecular hydrogen bonding.
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