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Updated: May 15, 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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Enhanced Intermediates Inter-migration on Ag Single-Atom Alloys for Boosting Multicarbon Product Selectivity in CO2
Min Wang1,2, Minghui Fang1,2, Yingxuan Liu1,2
1Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China.
Journal of the American Chemical Society
|May 2, 2025
Summary
This study introduces a novel silver-copper single-atom alloy cascade catalyst (AgCu-SAA) for electrochemical carbon dioxide reduction reaction (CO2RR). The catalyst significantly improves selectivity for multicarbon products by enhancing carbon monoxide intermediate utilization.
Area of Science:
- Electrochemistry
- Catalysis
- Materials Science
Background:
- Electrochemical CO2 reduction reaction (CO2RR) is crucial for carbon cycle management and energy solutions.
- Achieving high selectivity for multicarbon (C2+) products remains a significant challenge in CO2RR.
- Efficient utilization of intermediates like carbon monoxide (CO) is key to improving CO2RR performance.
Purpose of the Study:
- To develop a novel catalyst for enhanced selectivity in electrochemical CO2 reduction to C2+ products.
- To investigate the mechanism of CO intermediate utilization in a cascade catalytic system.
- To achieve high Faradaic efficiency for C2+ products at industrially relevant current densities.
Main Methods:
- Fabrication of a silver-copper single-atom alloy cascade catalyst (AgCu-SAA) via an epoxide gelation approach.
- Electrochemical characterization including cyclic voltammetry and chronoamperometry.
- In situ Raman spectroscopy and density functional theory (DFT) calculations to elucidate reaction mechanisms.
Main Results:
- The AgCu-SAA catalyst achieved a Faradaic efficiency (FE) of 83.4% for C2+ products at 900 mA cm-2.
- High FE for C2+ products (74.8%) was maintained even at a high current density of 1100 mA cm-2.
- In situ and DFT studies confirmed direct CO transfer from Ag single-atom sites to adjacent Cu sites, enhancing CO utilization.
Conclusions:
- The AgCu-SAA catalyst effectively promotes CO2RR to C2+ products by facilitating an inter-migration pathway for CO intermediates.
- This cascade catalytic approach significantly improves selectivity and efficiency, overcoming limitations of CO desorption.
- The findings offer a promising strategy for designing advanced catalysts for efficient electrochemical CO2 conversion.
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