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dc.contributor.authorYilmazel, Yasemin D.
dc.contributor.authorZhu, Xiuping
dc.contributor.authorKim, Kyoung-Yeol
dc.contributor.authorHolmes, Dawn E.
dc.contributor.authorLogan, Bruce E.
dc.date.accessioned2017-11-01T08:19:11Z
dc.date.available2017-11-01T08:19:11Z
dc.date.issued2017-10-02
dc.identifier.citationYilmazel 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.
dc.identifier.issn1567-5394
dc.identifier.doi10.1016/j.bioelechem.2017.09.012
dc.identifier.urihttp://hdl.handle.net/10754/626076
dc.description.abstractFew 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.
dc.description.sponsorshipThis 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.
dc.publisherElsevier BV
dc.subjectHyperthermophilic archaea
dc.subjectFerroglobus placidus
dc.subjectGeoglobus ahangari
dc.subjectHyperthermophilic MEC
dc.titleElectrical current generation in microbial electrolysis cells by hyperthermophilic archaea Ferroglobus placidus and Geoglobus ahangari
dc.typeArticle
dc.identifier.journalBioelectrochemistry
dc.contributor.institutionDepartment of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA, USA
dc.contributor.institutionDepartment of Chemical Engineering, Rochester Institute of Technology, Rochester, NY, USA
dc.contributor.institutionDepartment of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA, USA
dc.contributor.institutionDepartment of Biology, Western New England University, Springfield, MA, USA
kaust.grant.numberKUS-I1-003-13
dc.date.published-online2017-10-02
dc.date.published-print2018-02


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