Bioelectrocatalytic Carbon Dioxide Reduction

  • ChemPubSoc Europe Logo
  • Author: Angewandte Chemie International Edition
  • Published Date: 28 May 2019
  • Source / Publisher: Angewandte Chemie International Edition/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Bioelectrocatalytic Carbon Dioxide Reduction

The use of enzymes can be an efficient route for carbon fixation. The enzyme formate dehydrogenase (FDH), for example, reduces carbon dioxide (CO2) to formic acid, coupled with the oxidation of the cofactor nicotinamide adenine dinucleotide (NADH) to NAD+. However, the enzymes are relatively unstable and hard to recycle, which limit the implementation of such processes. Metal-organic frameworks (MOFs), a class of porous crystalline materials, can be used as a stabilizing support for enzymes to prevent structural changes that affect their reactivity.


Omar K. Farha, Northwestern University, Evanston, IL, USA, and colleagues have synthesized a MOF called NU-1006 with large channels which can encapsulate FDH (pictured on yellow background). For the electrocatalytic conversion of NAD+ to NADH, a ZrO2-modified glass electrode (pictured in red) with a coordinated rhodium-based electron mediator (pictured in purple) was used. Drop-casting of the MOF-enzyme composite onto this rhodium-complex-modified electrode resulted in a complete bioelectrochemical reaction system (pictured below).


This system consistently provides FDH with NADH for the conversion of dissolved CO2 to formic acid. The MOF stabilizes FDH even under unfavorable conditions (for example, in an acidic environment), which can double the formic acid production compared to the free enzyme.

 


 

Article Views: 836

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH