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    Intermittent contact of fluidized anode particles containing exoelectrogenic biofilms for continuous power generation in microbial fuel cells

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    Type
    Article
    Authors
    Liu, Jia
    Zhang, Fang cc
    He, Weihua cc
    Zhang, Xiaoyuan cc
    Feng, Yujie
    Logan, Bruce E.
    KAUST Grant Number
    KUS-I1-003-13
    Date
    2014-09
    Permanent link to this record
    http://hdl.handle.net/10754/598659
    
    Metadata
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    Abstract
    Current generation in a microbial fuel cell can be limited by the amount of anode surface area available for biofilm formation, and slow substrate degradation kinetics. Increasing the anode surface area can increase the amount of biofilm, but performance will improve only if the anode material is located near the cathode to minimize solution internal resistance. Here we demonstrate that biofilms do not have to be in constant contact with the anode to produce current in an MFC. Granular activated carbon particles enriched with exoelectrogenic biofilm are fluidized (by stirring) in the anode chamber of the MFC, resulting in only intermittent contact between the particles and the anode current collector. The maximum power density generated is 951 ± 10 mW m-2, compared to 813 ± 2 mW m-2 for the control without stirring (packed bed), and 525 ± 1 mW m-2 in the absence of GAC particles and without stirring. GAC-biofilm particles demonstrate capacitor-like behavior, but achieve nearly constant discharge conditions due to the large number of particles that contact the current collector. These results provide proof of concept for the development of flowable electrode reactors, where anode biofilms can be electrically charged in a separate storage tank and then rapidly discharged in compact anode chambers. © 2014 Elsevier B.V. All rights reserved.
    Citation
    Liu J, Zhang F, He W, Zhang X, Feng Y, et al. (2014) Intermittent contact of fluidized anode particles containing exoelectrogenic biofilms for continuous power generation in microbial fuel cells. Journal of Power Sources 261: 278–284. Available: http://dx.doi.org/10.1016/j.jpowsour.2014.03.071.
    Sponsors
    This work was supported by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST), the State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (Grant No 2013DX08), the National Natural Science Foundation of China for Distinguished Young Scholars (51125033), National Funds for Creative Research Group of China (Grant No. 51121062) and Science and Technology Cooperation Project Between the Government of Canada and China (2011DFG96630).
    Publisher
    Elsevier BV
    Journal
    Journal of Power Sources
    ISSN
    0378-7753
    DOI
    10.1016/j.jpowsour.2014.03.071
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jpowsour.2014.03.071
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