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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Oxygen-Substituted Porous C2N Frameworks as Efficient Electrocatalysts for Carbon Dioxide Electroreduction
Shuai Wang1, Shujie Zhou2, Zhipeng Ma2
1State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, P.R. China.
This study introduces oxygen-substituted C2N as a metal-free catalyst for efficient electrochemical carbon dioxide reduction to carbon monoxide. Optimized catalysts achieve high CO selectivity (94.8%) and stability in flow cells.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- Electrochemical carbon dioxide reduction (CO2RR) is crucial for sustainable chemical production.
- Catalyst structure-selectivity is key for controlling CO2RR pathways.
- Metal-free catalysts offer a greener alternative for CO2RR.
Purpose of the Study:
- To fabricate and characterize an oxygen-substituted C2N (O-C2N) metal-free catalyst for CO2RR.
- To establish a structure-selectivity relationship for CO2 to CO conversion.
- To optimize O-C2N catalysts for high activity and selectivity.
Main Methods:
- Fabrication of oxygen-substituted C2N (O-C2N) catalysts.
- Spectroscopic analysis to determine catalyst structure and oxygen configurations.
- Electrochemical testing in a flow-cell reactor to evaluate CO2RR performance.
Main Results:
- O-C2N catalysts with tailored N-C-O moieties were successfully synthesized.
- C-O-C species (e.g., ring in-plane ether) were identified as dominant oxygen configurations at higher pyrolysis temperatures.
- Optimized O-C2N achieved 94.8% CO selectivity in CO2RR with excellent stability.
Conclusions:
- A correlation between exocyclic O-substituted N-C-O-C moieties and CO selectivity was established.
- O-C2N metal-free catalysts offer a promising pathway for selective electrochemical CO2 to CO conversion.
- The developed catalysts demonstrate potential for industrial applications with adjustable syngas production.
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