Bicarbonate-Stabilized Cu₂O/Cu Heterointerfaces Enable Efficient Ethylene Electrosynthesis From Carbon Capture...

Area of Science:

• Electrochemistry
• Catalysis
• Sustainable Chemical Manufacturing

Background:

• Direct electrochemical conversion of CO2 offers a sustainable alternative to traditional methods.
• Challenges remain in achieving high selectivity and operational stability for CO2 conversion.

Purpose of the Study:

• To investigate the role of bicarbonate in stabilizing copper-based catalysts for CO2 electroreduction.
• To enable efficient and durable production of multi-carbon (C2+) products from carbon capture solutions.

Main Methods:

• Utilized laminate oxide-derived copper (LOD-Cu) catalysts in a zero-gap membrane electrode assembly (MEA) electrolyzer.
• Employed in situ spectroscopic analysis to understand catalyst behavior.
• Conducted long-term operational stability tests.

Main Results:

• Bicarbonate was found to stabilize Cu2O/Cu heterointerfaces in LOD-Cu catalysts.
• Achieved a stable ethylene (C2H4) Faradaic efficiency of approximately 54% at 200 mA cm-2 over 80 hours.
• Demonstrated that bicarbonate prevents full Cu2O reduction, preserving active sites for C-C coupling.

Conclusions:

• Bicarbonate plays a crucial role in stabilizing catalytic interfaces for efficient CO2 electroreduction.
• This study presents a practical strategy for integrating carbon capture with renewable chemical synthesis.
• The findings pave the way for durable and selective electrochemical production of ethylene from CO2.