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dc.contributor.authorHong, Yiying
dc.contributor.authorCall, Douglas F.
dc.contributor.authorWerner, Craig M.
dc.contributor.authorLogan, Bruce E.
dc.date.accessioned2015-08-03T09:33:24Z
dc.date.available2015-08-03T09:33:24Z
dc.date.issued2011-10
dc.identifier.issn09565663
dc.identifier.pmid21831626
dc.identifier.doi10.1016/j.bios.2011.06.045
dc.identifier.urihttp://hdl.handle.net/10754/561889
dc.description.abstractOne form of power overshoot commonly observed with mixed culture microbial fuel cells (MFCs) is doubling back of the power density curve at higher current densities, but the reasons for this type of overshoot have not been well explored. To investigate this, MFCs were acclimated to different external resistances, producing a range of anode potentials and current densities. Power overshoot was observed for reactors acclimated to higher (500 and 5000. Ω) but not lower (5 and 50. Ω) resistances. Acclimation of the high external resistance reactors for a few cycles to low external resistance (5. Ω), and therefore higher current densities, eliminated power overshoot. MFCs initially acclimated to low external resistances exhibited both higher current in cyclic voltammograms (CVs) and higher levels of redox activity over a broader range of anode potentials (-0.4 to 0. V; vs. a Ag/AgCl electrode) based on first derivative cyclic voltammetry (DCV) plots. Reactors acclimated to higher external resistances produced lower current in CVs, exhibited lower redox activity over a narrower anode potential range (-0.4 to -0.2. V vs. Ag/AgCl), and failed to produce higher currents above ∼-0.3. V (vs. Ag/AgCl). After the higher resistance reactors were acclimated to the lowest resistance they also exhibited similar CV and DCV profiles. Our findings show that to avoid overshoot, prior to the polarization and power density tests the anode biofilm must adapt to low external resistances to be capable of higher currents. © 2011 Elsevier B.V.
dc.description.sponsorshipThis research was supported by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST) and a National Science Foundation Graduate Research Fellowship (D.F.C.).
dc.publisherElsevier BV
dc.subjectExternal resistance
dc.subjectMicrobial fuel cell
dc.subjectPolarization
dc.subjectPower overshoot
dc.titleAdaptation to high current using low external resistances eliminates power overshoot in microbial fuel cells
dc.typeArticle
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.identifier.journalBiosensors and Bioelectronics
dc.contributor.institutionDepartment of Civil and Environmental Engineering, Pennsylvania State University, University Park, PA 16802, United States
kaust.personWerner, Craig M.


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