Analysis of carbon fiber brush loading in anodes on startup and performance of microbial fuel cells

Handle URI:
http://hdl.handle.net/10754/597552
Title:
Analysis of carbon fiber brush loading in anodes on startup and performance of microbial fuel cells
Authors:
Hutchinson, Adam J.; Tokash, Justin C.; Logan, Bruce E.
Abstract:
Flat carbon anodes placed near a cathode in a microbial fuel cell (MFC) are adversely affected by oxygen crossover, but graphite fiber brush anodes placed near the cathode produce high power densities. The impact of the brush size and electrode spacing was examined by varying the distance of the brush end from the cathode and solution conductivity in multiple MFCs. The startup time was increased from 8 ± 1 days with full brushes (all buffer concentrations) to 13 days (50 mM), 14 days (25 mM) and 21 days (8 mM) when 75% of the brush anode was removed. When MFCs were all first acclimated with a full brush, up to 65% of the brush material could be removed without appreciably altering maximum power. Electrochemical impedance spectroscopy (EIS) showed that the main source of internal resistance (IR) was diffusion resistance, which together with solution resistance reached 100 Ω. The IR using EIS compared well with that obtained using the polarization data slope method, indicating no major components of IR were missed. These results show that using full brush anodes avoids adverse effects of oxygen crossover during startup, although brushes are much larger than needed to sustain high power. © 2011 Elsevier B.V.
Citation:
Hutchinson AJ, Tokash JC, Logan BE (2011) Analysis of carbon fiber brush loading in anodes on startup and performance of microbial fuel cells. Journal of Power Sources 196: 9213–9219. Available: http://dx.doi.org/10.1016/j.jpowsour.2011.07.040.
Publisher:
Elsevier BV
Journal:
Journal of Power Sources
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
Nov-2011
DOI:
10.1016/j.jpowsour.2011.07.040
Type:
Article
ISSN:
0378-7753
Sponsors:
This research was supported by funding through 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.authorHutchinson, Adam J.en
dc.contributor.authorTokash, Justin C.en
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2016-02-25T12:41:55Zen
dc.date.available2016-02-25T12:41:55Zen
dc.date.issued2011-11en
dc.identifier.citationHutchinson AJ, Tokash JC, Logan BE (2011) Analysis of carbon fiber brush loading in anodes on startup and performance of microbial fuel cells. Journal of Power Sources 196: 9213–9219. Available: http://dx.doi.org/10.1016/j.jpowsour.2011.07.040.en
dc.identifier.issn0378-7753en
dc.identifier.doi10.1016/j.jpowsour.2011.07.040en
dc.identifier.urihttp://hdl.handle.net/10754/597552en
dc.description.abstractFlat carbon anodes placed near a cathode in a microbial fuel cell (MFC) are adversely affected by oxygen crossover, but graphite fiber brush anodes placed near the cathode produce high power densities. The impact of the brush size and electrode spacing was examined by varying the distance of the brush end from the cathode and solution conductivity in multiple MFCs. The startup time was increased from 8 ± 1 days with full brushes (all buffer concentrations) to 13 days (50 mM), 14 days (25 mM) and 21 days (8 mM) when 75% of the brush anode was removed. When MFCs were all first acclimated with a full brush, up to 65% of the brush material could be removed without appreciably altering maximum power. Electrochemical impedance spectroscopy (EIS) showed that the main source of internal resistance (IR) was diffusion resistance, which together with solution resistance reached 100 Ω. The IR using EIS compared well with that obtained using the polarization data slope method, indicating no major components of IR were missed. These results show that using full brush anodes avoids adverse effects of oxygen crossover during startup, although brushes are much larger than needed to sustain high power. © 2011 Elsevier B.V.en
dc.description.sponsorshipThis research was supported by funding through the King Abdullah University of Science and Technology (KAUST) (Award KUS-I1-003-13).en
dc.publisherElsevier BVen
dc.subjectCarbon fiber brush anodesen
dc.subjectElectrochemical impedance spectroscopyen
dc.subjectInternal resistanceen
dc.subjectMicrobial fuel cellen
dc.titleAnalysis of carbon fiber brush loading in anodes on startup and performance of microbial fuel cellsen
dc.typeArticleen
dc.identifier.journalJournal of Power Sourcesen
dc.contributor.institutionPennsylvania State University, State College, United Statesen
kaust.grant.numberKUS-I1-003-13en
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