Characterization of microbial fuel cells at microbially and electrochemically meaningful time scales

Zhiyong Ren, Hengjing Yan, Wei Wang, Matthew M. Mench, John M. Regan

Research output: Contribution to journalArticle

79 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)2435-2441
Number of pages7
JournalEnvironmental Science and Technology
Volume45
Issue number6
DOIs
StatePublished - Mar 15 2011

Fingerprint

Microbial fuel cells
Biofilms
fuel cell
biofilm
Anodes
timescale
Enzymes
Charge transfer
acetate
Bacteria
electricity
Acetates
Cathodes
Electricity
bacterium

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Ren, Zhiyong ; Yan, Hengjing ; Wang, Wei ; Mench, Matthew M. ; Regan, John M. / Characterization of microbial fuel cells at microbially and electrochemically meaningful time scales. In: Environmental Science and Technology. 2011 ; Vol. 45, No. 6. pp. 2435-2441.
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Characterization of microbial fuel cells at microbially and electrochemically meaningful time scales. / Ren, Zhiyong; Yan, Hengjing; Wang, Wei; Mench, Matthew M.; Regan, John M.

In: Environmental Science and Technology, Vol. 45, No. 6, 15.03.2011, p. 2435-2441.

Research output: Contribution to journalArticle

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