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Dynamically Reconstructed Cu Nanowire Arrays Realizing Efficient Industrial-Current-Density CO2-to-C2+
Shumin Wang1, Han Lei1, Yongfu Sun1
1Hefei National Research Center for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, P.R. China.
Nano Letters
|May 14, 2025
Summary
This study developed copper (Cu) nanowire arrays for efficient carbon dioxide (CO2) electroreduction. The novel catalyst design significantly boosts the production of valuable C2+ products at high current densities.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- Selective production of carbon dioxide (CO2) electroreduced products, specifically C2+ compounds, at industrial current densities remains a significant challenge for copper-based catalysts.
- Existing catalysts often struggle to achieve high efficiency and selectivity under demanding operational conditions.
Purpose of the Study:
- To design and fabricate a novel catalyst structure for enhanced CO2 electroreduction to C2+ products.
- To investigate the structure-performance relationship and reaction mechanisms of the developed catalyst.
Main Methods:
- Fabrication of self-supporting Cu nanowire arrays on a gas diffusion layer via in situ electroreduction of Cu(OH)2 nanowire arrays.
- In situ X-ray diffraction and Raman spectroscopy to monitor dynamic phase transformations.
- Finite-element method calculations to elucidate reactant enrichment.
- Operando Raman and in situ attenuated total reflection-surface-enhanced infrared absorption spectroscopy to study reaction intermediates.
Main Results:
- The Cu nanowire array structure effectively enriches local CO2/CO concentrations.
- Operando spectroscopy confirmed the promotion of *CO dimerization into *OCCO intermediates by the Cu nanowire arrays.
- Achieved a high Faradaic efficiency of 75.4% for C2+ products at a current density of 500 mA cm-2.
Conclusions:
- The developed Cu nanowire array catalyst demonstrates superior performance for selective C2+ production via CO2 electroreduction.
- The array architecture creates confined spaces that enhance reactant and intermediate concentrations, leading to improved catalytic activity.
- This study offers valuable insights for designing advanced array catalysts for efficient electrochemical CO2 conversion.
