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

ChemSusChem
Sarah M Strycharz-Glaven, Leonard M Tender

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.

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Citations

Sep 8, 2012·Proceedings of the National Academy of Sciences of the United States of America·Rachel M SniderLeonard M Tender
Apr 23, 2013·Applied and Environmental Microbiology·Sarah M Strycharz-GlavenLeonard M Tender
Nov 26, 2013·Applied Microbiology and Biotechnology·Miriam A Rosenbaum, Ashley E Franks
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Dec 7, 2013·ChemSusChem·Germán David SchrottJuan Pablo Busalmen
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