Characterization of Microbial Fuel Cells at Microbially and Electrochemically Meaningful Time scales

Handle URI:
http://hdl.handle.net/10754/597759
Title:
Characterization of Microbial Fuel Cells at Microbially and Electrochemically Meaningful Time scales
Authors:
Ren, Zhiyong; Yan, Hengjing; Wang, Wei; Mench, Matthew M.; Regan, John M.
Abstract:
The variable biocatalyst density in a microbial fuel cell (MFC) anode biofilm is a unique feature of MFCs relative to other electrochemical systems, yet performance characterizations of MFCs typically involve analyses at electrochemically relevant time scales that are insufficient to account for these variable biocatalyst effects. This study investigated the electrochemical performance and the development of anode biofilm architecture under different external loadings, with duplicate acetate-fed singlechamber MFCs stabilized at each resistance for microbially relevant time scales. Power density curves from these steady-state reactors generally showed comparable profiles despite the fact that anode biofilm architectures and communities varied considerably, showing that steady-state biofilm differences had little influence on electrochemical performance until the steady-state external loading was much larger than the reactor internal resistance. Filamentous bacteria were dominant on the anodes under high external resistances (1000 and 5000 Ω), while more diverse rod-shaped cells formed dense biofilms under lower resistances (10, 50, and 265 Ω). Anode charge transfer resistance decreased with decreasing fixed external resistances, but was consistently 2 orders of magnitude higher than the resistance at the cathode. Cell counting showed an inverse exponential correlation between cell numbers and external resistances. This direct link ofMFCanode biofilm evolution with external resistance and electricity production offers several operational strategies for system optimization. © 2011 American Chemical Society.
Citation:
Ren Z, Yan H, Wang W, Mench MM, Regan JM (2011) Characterization of Microbial Fuel Cells at Microbially and Electrochemically Meaningful Time scales. Environ Sci Technol 45: 2435–2441. Available: http://dx.doi.org/10.1021/es103115a.
Publisher:
American Chemical Society (ACS)
Journal:
Environmental Science & Technology
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
15-Mar-2011
DOI:
10.1021/es103115a
PubMed ID:
21329346
Type:
Article
ISSN:
0013-936X; 1520-5851
Sponsors:
This work was supported by National Science Foundation Grant CBET-0834033 and 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.authorRen, Zhiyongen
dc.contributor.authorYan, Hengjingen
dc.contributor.authorWang, Weien
dc.contributor.authorMench, Matthew M.en
dc.contributor.authorRegan, John M.en
dc.date.accessioned2016-02-25T12:56:13Zen
dc.date.available2016-02-25T12:56:13Zen
dc.date.issued2011-03-15en
dc.identifier.citationRen Z, Yan H, Wang W, Mench MM, Regan JM (2011) Characterization of Microbial Fuel Cells at Microbially and Electrochemically Meaningful Time scales. Environ Sci Technol 45: 2435–2441. Available: http://dx.doi.org/10.1021/es103115a.en
dc.identifier.issn0013-936Xen
dc.identifier.issn1520-5851en
dc.identifier.pmid21329346en
dc.identifier.doi10.1021/es103115aen
dc.identifier.urihttp://hdl.handle.net/10754/597759en
dc.description.abstractThe variable biocatalyst density in a microbial fuel cell (MFC) anode biofilm is a unique feature of MFCs relative to other electrochemical systems, yet performance characterizations of MFCs typically involve analyses at electrochemically relevant time scales that are insufficient to account for these variable biocatalyst effects. This study investigated the electrochemical performance and the development of anode biofilm architecture under different external loadings, with duplicate acetate-fed singlechamber MFCs stabilized at each resistance for microbially relevant time scales. Power density curves from these steady-state reactors generally showed comparable profiles despite the fact that anode biofilm architectures and communities varied considerably, showing that steady-state biofilm differences had little influence on electrochemical performance until the steady-state external loading was much larger than the reactor internal resistance. Filamentous bacteria were dominant on the anodes under high external resistances (1000 and 5000 Ω), while more diverse rod-shaped cells formed dense biofilms under lower resistances (10, 50, and 265 Ω). Anode charge transfer resistance decreased with decreasing fixed external resistances, but was consistently 2 orders of magnitude higher than the resistance at the cathode. Cell counting showed an inverse exponential correlation between cell numbers and external resistances. This direct link ofMFCanode biofilm evolution with external resistance and electricity production offers several operational strategies for system optimization. © 2011 American Chemical Society.en
dc.description.sponsorshipThis work was supported by National Science Foundation Grant CBET-0834033 and King Abdullah University of Science and Technology (KAUST; Award KUS-I1-003-13).en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleCharacterization of Microbial Fuel Cells at Microbially and Electrochemically Meaningful Time scalesen
dc.typeArticleen
dc.identifier.journalEnvironmental Science & Technologyen
dc.contributor.institutionPennsylvania State University, State College, United Statesen
dc.contributor.institutionUniversity of Colorado at Denver, Denver, United Statesen
dc.contributor.institutionUniversity of Tennessee, Knoxville, Knoxville, United Statesen
kaust.grant.numberKUS-I1-003-13en

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