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Cable Bacteria Skeletons as Catalytically Active Electrodes.

Leonid Digel1, Maciej Mierzwa2, Robin Bonné1

  • 1Center for Electromicrobiology, Department of Biology, Aarhus University, 8000, Aarhus, Denmark.

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Summary
This summary is machine-generated.

Cable bacteria utilize conductive fibers for electron transfer, acting as bio-electrodes. These fibers catalyze oxygen reactions, explaining high oxygen consumption in living bacteria.

Keywords:
BioelectrochemistryBipolar ElectrochemistryCable BacteriaOxygen Evolution ReactionOxygen Reduction Reaction

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Area of Science:

  • Microbiology
  • Electrochemistry
  • Biotechnology

Background:

  • Cable bacteria are filamentous microorganisms that transport electrons over long distances.
  • They possess internal conductive fibers facilitating extracellular electron transfer.
  • Understanding their electrocatalytic properties is crucial for bio-energy applications.

Purpose of the Study:

  • To investigate the electrocatalytic behavior of extracted cable bacteria fibers.
  • To determine if these fibers can catalyze oxygen reduction and evolution reactions.
  • To elucidate the role of fiber electrocatalysis in the metabolic processes of cable bacteria.

Main Methods:

  • Extraction of conductive fibers from cable bacteria.
  • Utilizing fibers as free-standing bio-based electrodes.
  • Electrochemical measurements to assess electrocatalytic activity.
  • Optical measurements to confirm oxygen reduction and evolution.

Main Results:

  • Extracted fibers demonstrated electrocatalytic activity for reversible oxygen and water interconversion.
  • Electric current flowed through fibers driven by oxygen concentration gradients alone.
  • Direct electrocatalysis on fibers, not membrane proteins, explains high oxygen consumption.
  • Electrocatalytic water oxidation by fibers may supply oxygen in anoxic zones.

Conclusions:

  • Cable bacteria fibers function as efficient bio-electrodes.
  • Direct electrocatalysis by fibers is key to cable bacteria's high oxygen consumption.
  • This mechanism offers insights into microbial energy metabolism and potential biotechnological applications.