Photo-assisted electrochemical CO₂ reduction using a translucent thin film electrode

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Electrochemical reduction of carbon dioxide (CO2) is a promising approach for sustainable chemical production.
• Developing efficient and stable electrocatalysts for CO2 reduction remains a significant challenge.
• Integrating light-assisted processes can potentially enhance the efficiency of electrochemical reactions.

Purpose of the Study:

• To introduce a new concept for photo-assisted electrochemical CO2 reduction.
• To investigate the performance of a novel translucent thin film electrode for CO2 conversion.
• To evaluate the CO production rate and photocurrent density of the developed system.

Main Methods:

• Fabrication of a translucent thin film electrode.
• Loading of gold (Au) nanoparticle-decorated silver (Ag) nanowires onto the electrode.
• Photo-assisted electrochemical CO2 reduction experiments under applied potential.
• Characterization of CO production rate and photocurrent density.

Main Results:

• Achieved a high CO production rate of 0.7 mmol cm⁻² h⁻¹.
• Obtained a significant photocurrent density of 6.05 mA cm⁻² at -1.1 V versus the reversible hydrogen electrode (V_RHE).
• Demonstrated the effectiveness of the light-compatible thin film electrode for direct CO2 exposure.

Conclusions:

• The developed photo-assisted electrochemical system offers an efficient route for CO2 reduction.
• The translucent thin film electrode design facilitates direct interaction between the catalyst and gaseous CO2 under illumination.
• This approach shows potential for scalable and sustainable carbon monoxide production.