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    Evaluation of electrode and solution area-based resistances enables quantitative comparisons of factors impacting microbial fuel cell performance

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    acs.est.8b06004.pdf
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    Type
    Article
    Authors
    Rossi, Ruggero
    Cario, Benjamin P
    Santoro, Carlo
    Yang, Wulin
    Saikaly, Pascal cc
    Logan, Bruce E.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Biotechnology Research Group
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2019-02-27
    Online Publication Date
    2019-02-27
    Print Publication Date
    2019-04-02
    Permanent link to this record
    http://hdl.handle.net/10754/631545
    
    Metadata
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    Abstract
    Direct comparisons of microbial fuel cells (MFCs) based on maximum power densities are hindered by different reactor and electrode sizes, solution conductivities, and materials. We propose an alternative method here, the electrode potential slope (EPS) analysis, to enable quantitative comparisons based on anode and cathode area-based resistances and operating potentials. Using the EPS analysis, the brush anode resistance (RAn= 10.6 ± 0.5 mΩ m2) was shown to be 28% less than the resistance of a 70% porosity diffusion layer (70% DL) cathode (Rcat = 14.8 ± 0.9 mΩ m2), and 24% less than the solution resistance (RΩ = 14 mΩ m2) (acetate in 50 mM phosphate buffer solution). Using a less porous cathode (30% DL) did not impact the cathode resistance, but it reduced the cathode performance due to a lower operating potential. With low conductivity domestic wastewater (RΩ = 87 mΩ m2), both electrodes had higher resistances, with RAn = 75 ± 9 mΩ m2 and RCat = 54 ± 7 mΩ m2 (70% DL). Our analysis of the literature using the EPS analysis shows how electrode resistances can easily be quantified to compare system performance when the electrode distances are changed or the electrodes have different sizes.
    Citation
    Rossi R, Cario BP, Santoro C, Yang W, Saikaly PE, et al. (2019) Evaluation of electrode and solution area-based resistances enables quantitative comparisons of factors impacting microbial fuel cell performance. Environmental Science & Technology. Available: http://dx.doi.org/10.1021/acs.est.8b06004.
    Sponsors
    The research was supported by funds provided by the Environmental Security Technology Certification Program via cooperative research agreement W9132T-16-2-0014 through the US Army Engineer Research and Development Center.
    Publisher
    American Chemical Society (ACS)
    Journal
    Environmental Science & Technology
    DOI
    10.1021/acs.est.8b06004
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.est.8b06004
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.est.8b06004
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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