Cable Bacteria Skeletons as Catalytically Active Electrodes

Leonid Digel; Maciej Mierzwa; Robin Bonné; Silvia E. Zieger; Ileana Alexandra Pavel; Elena Ferapontova; Klaus Koren; Thomas Boesen; Falk Harnisch; Ian P.G. Marshall; Lars Peter Nielsen; Alexander Kuhn

doi:10.1002/anie.202312647

Cable Bacteria Skeletons as Catalytically Active Electrodes

Leonid Digel, Maciej Mierzwa, Robin Bonné, Silvia E. Zieger, Ileana Alexandra Pavel, Elena Ferapontova, Klaus Koren, Thomas Boesen, Falk Harnisch, Ian P.G. Marshall, Lars Peter Nielsen^*, Alexander Kuhn^*

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

6 Citations (Scopus)

Abstract

Cable bacteria are multicellular, filamentous bacteria that use internal conductive fibers to transfer electrons over centimeter distances from donors within anoxic sediment layers to oxygen at the surface. We extracted the fibers and used them as free-standing bio-based electrodes to investigate their electrocatalytic behavior. The fibers catalyzed the reversible interconversion of oxygen and water, and an electric current was running through the fibers even when the potential difference was generated solely by a gradient of oxygen concentration. Oxygen reduction as well as oxygen evolution were confirmed by optical measurements. Within living cable bacteria, oxygen reduction by direct electrocatalysis on the fibers and not by membrane-bound proteins readily explains exceptionally high cell-specific oxygen consumption rates observed in the oxic zone, while electrocatalytic water oxidation may provide oxygen to cells in the anoxic zone.

Original language	English
Article number	e202312647
Journal	Angewandte Chemie - International Edition
Volume	63
Issue	6
Number of pages	7
ISSN	1433-7851
DOIs	https://doi.org/10.1002/anie.202312647
Publication status	Published - 5 Feb 2024

Keywords

Bioelectrochemistry
Bipolar Electrochemistry
Cable Bacteria
Oxygen Evolution Reaction
Oxygen Reduction Reaction

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title = "Cable Bacteria Skeletons as Catalytically Active Electrodes",

abstract = "Cable bacteria are multicellular, filamentous bacteria that use internal conductive fibers to transfer electrons over centimeter distances from donors within anoxic sediment layers to oxygen at the surface. We extracted the fibers and used them as free-standing bio-based electrodes to investigate their electrocatalytic behavior. The fibers catalyzed the reversible interconversion of oxygen and water, and an electric current was running through the fibers even when the potential difference was generated solely by a gradient of oxygen concentration. Oxygen reduction as well as oxygen evolution were confirmed by optical measurements. Within living cable bacteria, oxygen reduction by direct electrocatalysis on the fibers and not by membrane-bound proteins readily explains exceptionally high cell-specific oxygen consumption rates observed in the oxic zone, while electrocatalytic water oxidation may provide oxygen to cells in the anoxic zone.",

keywords = "Bioelectrochemistry, Bipolar Electrochemistry, Cable Bacteria, Oxygen Evolution Reaction, Oxygen Reduction Reaction",

author = "Leonid Digel and Maciej Mierzwa and Robin Bonn{\'e} and Zieger, {Silvia E.} and Pavel, {Ileana Alexandra} and Elena Ferapontova and Klaus Koren and Thomas Boesen and Falk Harnisch and Marshall, {Ian P.G.} and Nielsen, {Lars Peter} and Alexander Kuhn",

year = "2024",

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doi = "10.1002/anie.202312647",

language = "English",

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T1 - Cable Bacteria Skeletons as Catalytically Active Electrodes

AU - Digel, Leonid

AU - Mierzwa, Maciej

AU - Bonné, Robin

AU - Zieger, Silvia E.

AU - Pavel, Ileana Alexandra

AU - Ferapontova, Elena

AU - Koren, Klaus

AU - Boesen, Thomas

AU - Harnisch, Falk

AU - Marshall, Ian P.G.

AU - Nielsen, Lars Peter

AU - Kuhn, Alexander

PY - 2024/2/5

Y1 - 2024/2/5

N2 - Cable bacteria are multicellular, filamentous bacteria that use internal conductive fibers to transfer electrons over centimeter distances from donors within anoxic sediment layers to oxygen at the surface. We extracted the fibers and used them as free-standing bio-based electrodes to investigate their electrocatalytic behavior. The fibers catalyzed the reversible interconversion of oxygen and water, and an electric current was running through the fibers even when the potential difference was generated solely by a gradient of oxygen concentration. Oxygen reduction as well as oxygen evolution were confirmed by optical measurements. Within living cable bacteria, oxygen reduction by direct electrocatalysis on the fibers and not by membrane-bound proteins readily explains exceptionally high cell-specific oxygen consumption rates observed in the oxic zone, while electrocatalytic water oxidation may provide oxygen to cells in the anoxic zone.

AB - Cable bacteria are multicellular, filamentous bacteria that use internal conductive fibers to transfer electrons over centimeter distances from donors within anoxic sediment layers to oxygen at the surface. We extracted the fibers and used them as free-standing bio-based electrodes to investigate their electrocatalytic behavior. The fibers catalyzed the reversible interconversion of oxygen and water, and an electric current was running through the fibers even when the potential difference was generated solely by a gradient of oxygen concentration. Oxygen reduction as well as oxygen evolution were confirmed by optical measurements. Within living cable bacteria, oxygen reduction by direct electrocatalysis on the fibers and not by membrane-bound proteins readily explains exceptionally high cell-specific oxygen consumption rates observed in the oxic zone, while electrocatalytic water oxidation may provide oxygen to cells in the anoxic zone.

KW - Bioelectrochemistry

KW - Bipolar Electrochemistry

KW - Cable Bacteria

KW - Oxygen Evolution Reaction

KW - Oxygen Reduction Reaction

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U2 - 10.1002/anie.202312647

DO - 10.1002/anie.202312647

M3 - Journal article

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AN - SCOPUS:85180840871

SN - 1433-7851

VL - 63

JO - Angewandte Chemie - International Edition

JF - Angewandte Chemie - International Edition

IS - 6

M1 - e202312647

ER -

Cable Bacteria Skeletons as Catalytically Active Electrodes

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Keywords

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