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Translating Extracellular Electron Transfer Activities with Organic Electrochemical Transistors
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Membrane-Intercalating Conjugated Oligoelectrolytes Enhance Microbial CO2 Electroreduction by Promoting Transmembrane

Xin Jing1, Xujun Zhao2, Zehua Chen3

  • 1School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230026, China.

Journal of the American Chemical Society
|May 28, 2026
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Summary

Membrane-intercalating conjugated oligoelectrolytes (MICOEs) enhance microbial CO2 electroreduction by improving hydrogen (H2) transport across cell membranes. Optimized MICOEs significantly boost acetate production from CO2.

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Area of Science:

  • Biotechnology
  • Electrochemistry
  • Microbiology

Background:

  • Transmembrane hydrogen (H2) transport is critical for microbial CO2 electroreduction efficiency.
  • Existing methods often overlook the role of H2 delivery in whole-cell bioprocesses.

Purpose of the Study:

  • To investigate membrane-intercalating conjugated oligoelectrolytes (MICOEs) as a strategy to enhance microbial CO2 electroreduction.
  • To elucidate the mechanism by which MICOEs improve transmembrane H2 transport.

Main Methods:

  • Design and synthesis of MICOEs with tunable side chain lengths.
  • Electrochemical characterization of MICOEs with acetogen *Sporomusa ovata*.
  • Mechanistic studies using fluorescent H2 probes, Laurdan assays, and molecular dynamics (MD) simulations.

Main Results:

  • An optimized MICOE significantly enhanced CO2-to-acetate partial current density to 1.15 mA cm-2 and acetate titer to 1.64 g L-1.
  • MICOE performance correlated with side chain length, with intermediate lengths being most effective.
  • Mechanistic studies confirmed MICOEs promote transmembrane H2 transport via optimal membrane perturbation.

Conclusions:

  • MICOEs represent a tunable and effective strategy for enhancing microbial CO2 electroreduction.
  • Optimized MICOEs improve H2 permeability, leading to increased efficiency in whole-cell bioprocesses.
  • This approach has potential applications in other H2-mediated microbial transformations.