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Updated: Jun 27, 2025
10:57
Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
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Switching CO2 Electroreduction toward Ethanol by Delocalization State-Tuned Bond Cleavage
Zhengzheng Liu1, Lu Song1, Ximeng Lv1
1Laboratory of Advanced Materials, Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200438, China.
Journal of the American Chemical Society
|May 7, 2024
Summary
Copper catalysts can convert carbon dioxide (CO2) into valuable multicarbon products. This study enhances ethanol selectivity by functionalizing copper catalysts, achieving 45% efficiency and stable conversion.
Area of Science:
- Electrochemistry
- Catalysis
- Materials Science
Background:
- Electrochemical carbon dioxide (CO2) reduction using copper-based catalysts is a key strategy for producing value-added multicarbon (C2+) products.
- Achieving high selectivity for C2+ alcohols, such as ethanol, is challenging due to the preferential formation of ethylene, linked to the CH2═CHO* intermediate's surface interactions.
- The pathway to ethanol or ethylene is determined by the cleavage of the Cu-O or O-C bond at the critical CH2═CHO* intermediate.
Purpose of the Study:
- To enhance the selectivity of copper catalysts for ethanol production via CO2 electroreduction.
- To investigate the effect of surface functionalization on the catalytic intermediates and reaction pathways.
- To develop a stable and efficient catalyst for industrial-scale CO2-to-ethanol conversion.
Main Methods:
- Applied a nitrene surface functionalization approach to tune the electron density of copper catalysts, inspired by hard-soft acid-base theory.
- Investigated the weakening and cleavage of the Cu-O bond in the adsorbed CH2═CHO* intermediate.
- Evaluated catalyst performance in a membrane electrode assembly electrolyzer under industrially relevant current densities.
Main Results:
- The nitrene-functionalized copper catalyst demonstrated significantly enhanced ethanol selectivity, achieving a 45% Faradaic efficiency.
- A peak partial current density of 406 mA·cm⁻² for ethanol production was recorded, surpassing unmodified and amide-functionalized copper catalysts.
- The functionalized catalyst maintained stable CO2-to-ethanol conversion for over 300 hours at 400 mA·cm⁻² in an electrolyzer.
Conclusions:
- Electron delocalization tuning via nitrene surface functionalization effectively promotes the ethanol pathway in CO2 electroreduction.
- The modified catalyst overcomes limitations in C2+ alcohol selectivity by facilitating specific intermediate bond cleavage and hydrogenation.
- This strategy offers a promising route for efficient and stable electrochemical conversion of CO2 to ethanol.
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