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Issue 40, 2012
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Multistep hopping and extracellular charge transfer in microbial redox chains

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Dissimilatory metal-reducing bacteria are microorganisms that gain energy by transferring respiratory electrons to extracellular solid-phase electron acceptors. In addition to its importance for physiology and natural environmental processes, this form of metabolism is being investigated for energy conversion and fuel production in bioelectrochemical systems, where microbes are used as biocatalysts at electrodes. One proposed strategy to accomplish this extracellular charge transfer involves forming a conductive pathway to electrodes by incorporating redox components on outer cell membranes and along extracellular appendages known as microbial nanowires within biofilms. To describe extracellular charge transfer in microbial redox chains, we employed a model based on incoherent hopping between sites in the chain and an interfacial treatment of electrochemical interactions with the surrounding electrodes. Based on this model, we calculated the current–voltage (IV) characteristics and found the results to be in good agreement with IV measurements across and along individual microbial nanowires produced by the bacterium Shewanella oneidensis MR-1. Based on our analysis, we propose that multistep hopping in redox chains constitutes a viable strategy for extracellular charge transfer in microbial biofilms.

Graphical abstract: Multistep hopping and extracellular charge transfer in microbial redox chains

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Publication details

The article was received on 12 Apr 2012, accepted on 18 Jun 2012 and first published on 18 Jun 2012

Article type: Paper
DOI: 10.1039/C2CP41185G
Citation: Phys. Chem. Chem. Phys., 2012,14, 13802-13808
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    Multistep hopping and extracellular charge transfer in microbial redox chains

    S. Pirbadian and M. Y. El-Naggar, Phys. Chem. Chem. Phys., 2012, 14, 13802
    DOI: 10.1039/C2CP41185G

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