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    Electrical current generation in microbial electrolysis cells by hyperthermophilic archaea Ferroglobus placidus and Geoglobus ahangari

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    Type
    Article
    Authors
    Yilmazel, Yasemin D.
    Zhu, Xiuping
    Kim, Kyoung-Yeol
    Holmes, Dawn E.
    Logan, Bruce E.
    KAUST Grant Number
    KUS-I1-003-13
    Date
    2017-10-02
    Online Publication Date
    2017-10-02
    Print Publication Date
    2018-02
    Permanent link to this record
    http://hdl.handle.net/10754/626076
    
    Metadata
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    Abstract
    Few microorganisms have been examined for current generation under thermophilic (40–65 °C) or hyperthermophilic temperatures (≥ 80 °C) in microbial electrochemical systems. Two iron-reducing archaea from the family Archaeoglobaceae, Ferroglobus placidus and Geoglobus ahangari, showed electro-active behavior leading to current generation at hyperthermophilic temperatures in single-chamber microbial electrolysis cells (MECs). A current density (j) of 0.68 ± 0.11 A/m2 was attained in F. placidus MECs at 85 °C, and 0.57 ± 0.10 A/m2 in G. ahangari MECs at 80 °C, with an applied voltage of 0.7 V. Cyclic voltammetry (CV) showed that both strains produced a sigmoidal catalytic wave, with a mid-point potential of − 0.39 V (vs. Ag/AgCl) for F. placidus and − 0.37 V for G. ahangari. The comparison of CVs using spent medium and turnover CVs, coupled with the detection of peaks at the same potentials in both turnover and non-turnover conditions, suggested that mediators were not used for electron transfer and that both archaea produced current through direct contact with the electrode. These two archaeal species, and other hyperthermophilic exoelectrogens, have the potential to broaden the applications of microbial electrochemical technologies for producing biofuels and other bioelectrochemical products under extreme environmental conditions.
    Citation
    Yilmazel YD, Zhu X, Kim K-Y, Holmes DE, Logan BE (2018) Electrical current generation in microbial electrolysis cells by hyperthermophilic archaea Ferroglobus placidus and Geoglobus ahangari. Bioelectrochemistry 119: 142–149. Available: http://dx.doi.org/10.1016/j.bioelechem.2017.09.012.
    Sponsors
    This research was supported by Global Climate Energy Project (GCEP, 134106) and the King Abdullah University of Science and Technology (KAUST, award KUS-I1-003-13). We thank the Penn State Microscopy and Cytometry Facility – University Park, PA for assistance with SEM analysis.
    Publisher
    Elsevier BV
    Journal
    Bioelectrochemistry
    DOI
    10.1016/j.bioelechem.2017.09.012
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.bioelechem.2017.09.012
    Scopus Count
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