Repository logo
 

Carboxysome-Inspired Electrocatalysis using Enzymes for the Reduction of CO2 at Low Concentrations.

Published version

Published version
Peer-reviewed

Repository DOI


Change log

Authors

Cobb, Samuel J 
Dharani, Azim M 
Oliveira, Ana Rita 
Pereira, Inês AC 

Abstract

The electrolysis of dilute CO2 streams suffers from low concentrations of dissolved substrate and its rapid depletion at the electrolyte-electrocatalyst interface. These limitations require first energy-intensive CO2 capture and concentration, before electrolyzers can achieve acceptable performances. For direct electrocatalytic CO2 reduction from low-concentration sources, we introduce a strategy that mimics the carboxysome in cyanobacteria by utilizing microcompartments with nanoconfined enzymes in a porous electrode. A carbonic anhydrase accelerates CO2 hydration kinetics and minimizes substrate depletion by making all dissolved carbon available for utilization, while a highly efficient formate dehydrogenase reduces CO2 cleanly to formate; down to even atmospheric concentrations of CO2 . This bio-inspired concept demonstrates that the carboxysome provides a viable blueprint for the reduction of low-concentration CO2 streams to chemicals by using all forms of dissolved carbon.

Description

Keywords

Carbon Dioxide Reduction, Electrochemistry, Enzyme Catalysis, Metalloenzymes, Protein Film Electrochemistry, Carbon Dioxide, Cyanobacteria, Carbonic Anhydrases, Organelles, Carbon

Journal Title

Angew Chem Int Ed Engl

Conference Name

Journal ISSN

1433-7851
1521-3773

Volume Title

Publisher

Wiley
Sponsorship
European Research Council (682833)