Set potential regulation reveals additional oxidation peaks of Geobacter sulfurreducens anodic biofilms

Type
Article

Authors
Zhu, Xiuping
Yates, Matthew D.
Logan, Bruce E.

KAUST Grant Number
KUS-I1-003-13

Date
2012-08

Abstract
Higher current densities produced in microbial fuel cells and other bioelectrochemical systems are associated with the presence of various Geobacter species. A number of electron transfer components are involved in extracellular electron transfer by the model exoelectrogen, Geobacter sulfurreducens. It has previously been shown that 5 main oxidation peaks can be identified in cyclic voltammetry scans. It is shown here that 7 separate oxidation peaks emerged over relatively long periods of time when a larger range of set potentials was used to acclimate electroactive biofilms. The potentials of oxidation peaks obtained with G. sulfurreducens biofilms acclimated at 0.60 V (vs. Ag/AgCl) were different from those that developed at - 0.46 V, and both of their peaks were different from those obtained for biofilms incubated at - 0.30 V, 0 V, and 0.30 V. These results expand the known range of potentials for which G. sulfurreducens produces identifiable oxidation peaks that could be important for extracellular electron transfer. © 2012 Elsevier B.V.

Citation
Zhu X, Yates MD, Logan BE (2012) Set potential regulation reveals additional oxidation peaks of Geobacter sulfurreducens anodic biofilms. Electrochemistry Communications 22: 116–119. Available: http://dx.doi.org/10.1016/j.elecom.2012.06.013.

Acknowledgements
This research was supported by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST). We also thank Hiroyuki Kashima for help in confirming the purity of the reactors.

Publisher
Elsevier BV

Journal
Electrochemistry Communications

DOI
10.1016/j.elecom.2012.06.013

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