Electrocatalytic CO2 reduction with a membrane supported manganese catalyst in aqueous solution

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Electrocatalytic reduction of carbon dioxide (CO2) is crucial for sustainable energy.
• Developing efficient and selective catalysts for CO2 conversion remains a challenge.

Purpose of the Study:

• To investigate the electrocatalytic performance of [Mn(bpy)(CO)3Br] immobilized in a Nafion membrane for CO2 reduction.
• To evaluate the effect of incorporating multi-walled carbon nanotubes (MWCNT) on the catalyst's activity and selectivity.

Main Methods:

• Heterogeneous electrocatalysis using a manganese complex ([Mn(bpy)(CO)3Br]) within a Nafion membrane.
• Electrochemical characterization in neutral aqueous electrolyte.
• Assessment of CO2 reduction products and yields.

Main Results:

• The [Mn(bpy)(CO)3Br]/Nafion system demonstrated active and selective electrocatalysis for CO2 to CO reduction.
• Addition of MWCNT resulted in approximately a 10-fold increase in current.
• Stable CO:H2 yields of 1:2 were achieved at -1.4 V vs. Ag/AgCl in neutral conditions (pH 7).

Conclusions:

• [Mn(bpy)(CO)3Br] in Nafion is a promising heterogeneous electrocatalyst for CO2 reduction.
• MWCNT incorporation significantly enhances the catalytic performance and stability.
• The findings offer a pathway for efficient CO2 utilization in aqueous media.