Analysis of polarization methods for elimination of power overshoot in microbial fuel cells

Handle URI:
http://hdl.handle.net/10754/597562
Title:
Analysis of polarization methods for elimination of power overshoot in microbial fuel cells
Authors:
Watson, Valerie J.; Logan, Bruce E.
Abstract:
Polarization curves from microbial fuel cells (MFCs) often show an unexpectedly large drop in voltage with increased current densities, leading to a phenomenon in the power density curve referred to as "power overshoot". Linear sweep voltammetry (LSV, 1 mV s- 1) and variable external resistances (at fixed intervals of 20 min) over a single fed-batch cycle in an MFC both resulted in power overshoot in power density curves due to anode potentials. Increasing the anode enrichment time from 30 days to 100 days did not eliminate overshoot, suggesting that insufficient enrichment of the anode biofilm was not the primary cause. Running the reactor at a fixed resistance for a full fed-batch cycle (~ 1 to 2 days), however, completely eliminated the overshoot in the power density curve. These results show that long times at a fixed resistance are needed to stabilize current generation by bacteria in MFCs, and that even relatively slow LSV scan rates and long times between switching circuit loads during a fed-batch cycle may produce inaccurate polarization and power density results for these biological systems. © 2010 Elsevier B.V. All rights reserved.
Citation:
Watson VJ, Logan BE (2011) Analysis of polarization methods for elimination of power overshoot in microbial fuel cells. Electrochemistry Communications 13: 54–56. Available: http://dx.doi.org/10.1016/j.elecom.2010.11.011.
Publisher:
Elsevier BV
Journal:
Electrochemistry Communications
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
Jan-2011
DOI:
10.1016/j.elecom.2010.11.011
Type:
Article
ISSN:
1388-2481
Sponsors:
This research was supported under a National Science Foundation (NSF) Graduate Research Fellowship, NSF grant CBET-0730359, and the King Abdullah University of Science and Technology (KAUST) (Award KUS-I1-003-13).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorWatson, Valerie J.en
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2016-02-25T12:42:06Zen
dc.date.available2016-02-25T12:42:06Zen
dc.date.issued2011-01en
dc.identifier.citationWatson VJ, Logan BE (2011) Analysis of polarization methods for elimination of power overshoot in microbial fuel cells. Electrochemistry Communications 13: 54–56. Available: http://dx.doi.org/10.1016/j.elecom.2010.11.011.en
dc.identifier.issn1388-2481en
dc.identifier.doi10.1016/j.elecom.2010.11.011en
dc.identifier.urihttp://hdl.handle.net/10754/597562en
dc.description.abstractPolarization curves from microbial fuel cells (MFCs) often show an unexpectedly large drop in voltage with increased current densities, leading to a phenomenon in the power density curve referred to as "power overshoot". Linear sweep voltammetry (LSV, 1 mV s- 1) and variable external resistances (at fixed intervals of 20 min) over a single fed-batch cycle in an MFC both resulted in power overshoot in power density curves due to anode potentials. Increasing the anode enrichment time from 30 days to 100 days did not eliminate overshoot, suggesting that insufficient enrichment of the anode biofilm was not the primary cause. Running the reactor at a fixed resistance for a full fed-batch cycle (~ 1 to 2 days), however, completely eliminated the overshoot in the power density curve. These results show that long times at a fixed resistance are needed to stabilize current generation by bacteria in MFCs, and that even relatively slow LSV scan rates and long times between switching circuit loads during a fed-batch cycle may produce inaccurate polarization and power density results for these biological systems. © 2010 Elsevier B.V. All rights reserved.en
dc.description.sponsorshipThis research was supported under a National Science Foundation (NSF) Graduate Research Fellowship, NSF grant CBET-0730359, and the King Abdullah University of Science and Technology (KAUST) (Award KUS-I1-003-13).en
dc.publisherElsevier BVen
dc.subjectMicrobial fuel cellen
dc.subjectPolarizationen
dc.subjectPower overshooten
dc.titleAnalysis of polarization methods for elimination of power overshoot in microbial fuel cellsen
dc.typeArticleen
dc.identifier.journalElectrochemistry Communicationsen
dc.contributor.institutionPennsylvania State University, State College, United Statesen
kaust.grant.numberKUS-I1-003-13en
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