Adaptation to high current using low external resistances eliminates power overshoot in microbial fuel cells

Handle URI:
http://hdl.handle.net/10754/561889
Title:
Adaptation to high current using low external resistances eliminates power overshoot in microbial fuel cells
Authors:
Hong, Yiying; Call, Douglas F.; Werner, Craig M.; Logan, Bruce E.
Abstract:
One 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.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC); Environmental Science and Engineering Program
Publisher:
Elsevier BV
Journal:
Biosensors and Bioelectronics
Issue Date:
Oct-2011
DOI:
10.1016/j.bios.2011.06.045
PubMed ID:
21831626
Type:
Article
ISSN:
09565663
Sponsors:
This 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.).
Appears in Collections:
Articles; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorHong, Yiyingen
dc.contributor.authorCall, Douglas F.en
dc.contributor.authorWerner, Craig M.en
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2015-08-03T09:33:24Zen
dc.date.available2015-08-03T09:33:24Zen
dc.date.issued2011-10en
dc.identifier.issn09565663en
dc.identifier.pmid21831626en
dc.identifier.doi10.1016/j.bios.2011.06.045en
dc.identifier.urihttp://hdl.handle.net/10754/561889en
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.en
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.).en
dc.publisherElsevier BVen
dc.subjectExternal resistanceen
dc.subjectMicrobial fuel cellen
dc.subjectPolarizationen
dc.subjectPower overshooten
dc.titleAdaptation to high current using low external resistances eliminates power overshoot in microbial fuel cellsen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.identifier.journalBiosensors and Bioelectronicsen
dc.contributor.institutionDepartment of Civil and Environmental Engineering, Pennsylvania State University, University Park, PA 16802, United Statesen
kaust.authorWerner, Craig M.en

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