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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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Creating a Low-Potential Redox Polymer for Efficient Electroenzymatic CO2 Reduction.

Mengwei Yuan1, Selmihan Sahin1,2, Rong Cai1

  • 1Department of Chemistry, University of Utah, 315 S 1400 E, Salt Lake City, UT, 84112, USA.

Angewandte Chemie (International Ed. in English)
|April 16, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel bioelectrode using cobaltocene-grafted poly(allylamine) to immobilize molybdenum-dependent formate dehydrogenase (Mo-FDH). This system efficiently reduces carbon dioxide (CO2) to formate at mild potentials.

Keywords:
carbon dioxidecobaltoceneformateformate dehydrogenaseredox polymers

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Area of Science:

  • Biotechnology and Bioelectrochemistry
  • Catalysis and Green Chemistry
  • Environmental Science and Engineering

Background:

  • Rising greenhouse gas emissions necessitate innovative carbon dioxide (CO2) reduction technologies.
  • Molybdenum-dependent formate dehydrogenase (Mo-FDH) is a key metalloenzyme for CO2 interconversion.
  • Efficient immobilization and electron mediation are crucial for bioelectrode performance.

Purpose of the Study:

  • To develop a novel bioelectrode for efficient CO2 reduction.
  • To immobilize Mo-FDH using a redox polymer for enhanced catalytic activity.
  • To investigate the electrochemical performance of the bioelectrode for CO2 to formate conversion.

Main Methods:

  • Synthesis of a cobaltocene-grafted poly(allylamine) (Cc-PAA) redox polymer.
  • Immobilization of Mo-FDH from Escherichia coli onto a carbon electrode surface via Cc-PAA.
  • Electrochemical characterization of the resulting bioelectrode for CO2 reduction.

Main Results:

  • The Cc-PAA polymer effectively mediated electrons to Mo-FDH and immobilized the enzyme.
  • The bioelectrode achieved a high Faradaic efficiency of 99±5% for CO2 reduction to formate.
  • Efficient catalysis was observed at a mild applied potential of -0.66 V vs. SHE.

Conclusions:

  • The developed bioelectrode offers a promising strategy for CO2 valorization.
  • The combination of redox polymers and metalloenzymes enhances CO2 reduction efficiency.
  • This approach contributes to the development of sustainable carbon capture and utilization technologies.