Self-Cleaning Catalyst Electrodes for Stabilized CO₂ Reduction to Hydrocarbons

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Copper (Cu) based electrocatalysts are promising for carbon dioxide (CO2) reduction to valuable hydrocarbons.
• Catalyst deactivation due to carbonaceous species accumulation remains a significant challenge, limiting their practical application.
• Developing strategies for enhanced catalyst stability is crucial for efficient CO2 conversion.

Purpose of the Study:

• To present a novel surface-restructuring strategy for stabilizing Cu catalyst electrodes.
• To investigate the role of pre-deposited foreign metal atoms in maintaining catalytic activity and durability.
• To demonstrate a method for achieving long-term, stable CO2 reduction to hydrocarbons.

Main Methods:

• Fabrication of Cu catalyst electrodes with pre-deposited palladium (Pd) atoms.
• Electrochemical CO2 reduction experiments under working conditions.
• In-situ surface analysis to monitor morphological and compositional changes.
• Testing catalyst durability over extended periods (up to 16 hours).

Main Results:

• Pd atoms induce continuous self-cleaning and restructuring of the Cu surface during CO2 reduction.
• The restructured Cu surface maintains catalytic properties, preventing deactivation by carbonaceous species.
• The Pd-decorated Cu electrode exhibits stable selectivity and current density for CO2 to hydrocarbons conversion for up to 16 hours.
• The approach is validated using Rhodium (Rh) instead of Pd, demonstrating its generality.

Conclusions:

• Surface restructuring induced by foreign metal atoms is an effective strategy for stabilizing Cu electrocatalysts.
• This method significantly enhances the catalytic durability for CO2 reduction to hydrocarbons.
• The findings offer a promising pathway for developing highly stable and efficient electrocatalysts for CO2 utilization.