Set potential regulation reveals additional oxidation peaks of Geobacter sulfurreducens anodic biofilms
KAUST Grant NumberKUS-I1-003-13
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AbstractHigher 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.
CitationZhu 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.
SponsorsThis 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.