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Surface Engineering on Commercial Cu Foil for Steering C2H4/CH4 Ratio in CO2 Electroreduction
Peiquan Ling1, Yinghuan Liu2, Zhiqiang Wang1
1Hefei National Laboratory for Physical Sciences at the Microscale, National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China.
Nano Letters
|March 24, 2022
Summary
This study enhances carbon dioxide electroreduction to C2 products using nanocavity-rich copper foil. This surface modification significantly boosts ethylene (C2H4) production over methane (CH4), crucial for sustainable energy.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- Selective electroreduction of carbon dioxide (CO2) to C2 products is vital for energy storage and sustainable development.
- Copper (Cu) based catalysts are promising for CO2 electroreduction, but achieving high selectivity towards C2 products remains a challenge.
Purpose of the Study:
- To design a Cu foil kinetic model with nanocavities to enhance selectivity towards C2 products in CO2 electroreduction.
- To investigate the role of nanocavities in steering the C2H4/CH4 ratio by influencing CO adsorption and C-C coupling.
Main Methods:
- Chemical kinetic simulation to model the effect of nanocavities on reaction pathways.
- Surface modification of commercial Cu foil using cyclic voltammetry to create nanocavities.
- Electrochemical evaluation of modified and pristine Cu foils for CO2 electroreduction.
Main Results:
- Nanocavities enrich adsorbed CO (θCOad) and lower the C-C coupling energy barrier, favoring C2H4 formation.
- Cu foil treated with cyclic voltammetry achieved a C2H4/CH4 ratio of 4.11, an 18-fold increase compared to pristine Cu foil.
- The findings demonstrate the effectiveness of nanocavity engineering for enhancing C2 selectivity.
Conclusions:
- Nanocavity-rich Cu foil is an effective strategy for improving C2H4 selectivity in CO2 electroreduction.
- Surface modification via nanocavities offers insights into mass transfer and energy barriers governing C-C coupling.
- This work provides a practical approach for catalyst design in sustainable energy applications.
