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ChemSusChem. 2012 Jun;5(6):1106-18. doi: 10.1002/cssc.201100737. Epub 2012 May 13.

Study of the mechanism of catalytic activity of G. sulfurreducens biofilm anodes during biofilm growth.

Author information

1
Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, 4555 Overlook Ave., SW, Washington DC, 20375, USA. sarah.glaven@nrl.navy.mil

Abstract

The number of investigations involving bioelectrochemical systems (BES), processes in which microorganisms catalyze electrode reactions, is increasing while their mechanisms remain unresolved. Geobacter sulfurreducens strain DL1 is a model electrode catalyst that forms multimicrobe-thick biofilms on anodes that catalyze the oxidation of acetate to result in an electric current. Here, we report the characterization by cyclic voltammetry (CV) of DL1 biofilm-modified anodes (biofilm anodes) performed during biofilm development. This characterization, based on our recently reported model of biofilm anode catalytic activity, indicates the following. 1) As a biofilm grows, catalytic activity scales linearly with the amount of anode-accessible redox cofactor in the biofilm. This observation is consistent with a catalytic activity that is limited during biofilm growth by electron transport from within cells to the extracellular redox cofactor. 2) Distinct voltammetric features are exhibited that reflect the presence of a redox cofactor expressed by cells that initially colonize an anode that is not involved in catalytic current generation.

PMID:
22581467
DOI:
10.1002/cssc.201100737
[Indexed for MEDLINE]

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