Electroenzymatic C-C Bond Formation from CO₂

Area of Science:

• Biochemistry
• Electrochemistry
• Catalysis

Background:

• Significant research has focused on electrochemical reduction of carbon dioxide (CO2) over the past decade.
• Developing catalysts for CO2 reduction that can form carbon-carbon (C-C) bonds remains a significant challenge.

Purpose of the Study:

• To investigate the bioelectrocatalysis of carbon dioxide (CO2) using vanadium nitrogenase from Azotobacter vinelandii.
• To develop a novel bioelectrochemical system for CO2 reduction to valuable hydrocarbons.

Main Methods:

• Utilized cobaltocenium derivatives for electron transfer to the catalytic VFe protein of vanadium nitrogenase.
• Employed a bioelectrochemical system that operates independently of ATP-hydrolysis.
• Investigated the reduction of CO2 to ethylene (C2H4) and propene (C3H6) using a single metalloenzyme.

Main Results:

• Successfully demonstrated the bioelectrocatalytic reduction of CO2 to ethylene (C2H4) and propene (C3H6).
• Achieved C-C bond formation in CO2 reduction using a single metalloenzyme.
• Showcased the efficacy of the cobaltocenium/VFe protein system for CO2 valorization.

Conclusions:

• Vanadium nitrogenase can be utilized as a bioelectrocatalyst for CO2 reduction to C2H4 and C3H6.
• This bioelectrochemical approach offers a promising pathway for sustainable CO2 conversion and C-C bond formation.
• The system's independence from ATP-hydrolysis simplifies the bioelectrocatalytic process.