Controlling the occurrence of power overshoot by adapting microbial fuel cells to high anode potentials
KAUST Grant NumberKUS-I1-003-13
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AbstractPower density curves for microbial fuel cells (MFCs) often show power overshoot, resulting in inaccurate estimation of MFC performance at high current densities. The reasons for power overshoot are not well understood, but biofilm acclimation and development are known factors. In order to better explore the reasons for power overshoot, exoelectrogenic biofilms were developed at four different anode potentials (-0.46 V, -0.24 V, 0 V, and 0.50 V vs. Ag/AgCl), and then the properties of the biofilms were examined using polarization tests and cyclic voltammetry (CV). The maximum power density of the MFCs was 1200±100 mW/m2. Power overshoot was observed in MFCs incubated at -0.46 V, but not those acclimated atmore positive potentials, indicating that bacterial activitywas significantly influenced by the anode acclimation potential. CV results further indicated that power overshoot of MFCs incubated at the lowest anode potential was associatedwith a decreasing electroactivity of the anodic biofilm in the high potential region,which resulted from a lack of sufficient electron transfer components to shuttle electrons at rates needed for these more positive potentials. © 2012 Elsevier B.V.
CitationZhu X, Tokash JC, Hong Y, Logan BE (2013) Controlling the occurrence of power overshoot by adapting microbial fuel cells to high anode potentials. Bioelectrochemistry 90: 30–35. Available: http://dx.doi.org/10.1016/j.bioelechem.2012.10.004.
SponsorsThis research was supported by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST). We also thank Dr. Ivan Ivanov for his helpful discussions.
CollectionsPublications Acknowledging KAUST Support
- Adaptation to high current using low external resistances eliminates power overshoot in microbial fuel cells.
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- Enhanced electricity production by use of reconstituted artificial consortia of estuarine bacteria grown as biofilms.
- Authors: Zhang J, Zhang E, Scott K, Burgess JG
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- Microbial community composition is unaffected by anode potential.
- Authors: Zhu X, Yates MD, Hatzell MC, Ananda Rao H, Saikaly PE, Logan BE
- Issue date: 2014 Jan 21
- Lack of anodic capacitance causes power overshoot in microbial fuel cells.
- Authors: Peng X, Yu H, Yu H, Wang X
- Issue date: 2013 Jun
- The overshoot phenomenon as a function of internal resistance in microbial fuel cells.
- Authors: Winfield J, Ieropoulos I, Greenman J, Dennis J
- Issue date: 2011 Apr