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

Handle URI:
http://hdl.handle.net/10754/626076
Title:
Electrical current generation in microbial electrolysis cells by hyperthermophilic archaea Ferroglobus placidus and Geoglobus ahangari
Authors:
Yilmazel, Yasemin D.; Zhu, Xiuping; Kim, Kyoung-Yeol; Holmes, Dawn E.; Logan, Bruce E.
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.
Publisher:
Elsevier BV
Journal:
Bioelectrochemistry
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
2-Oct-2017
DOI:
10.1016/j.bioelechem.2017.09.012
Type:
Article
ISSN:
1567-5394
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.
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Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorYilmazel, Yasemin D.en
dc.contributor.authorZhu, Xiupingen
dc.contributor.authorKim, Kyoung-Yeolen
dc.contributor.authorHolmes, Dawn E.en
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2017-11-01T08:19:11Z-
dc.date.available2017-11-01T08:19:11Z-
dc.date.issued2017-10-02en
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.en
dc.identifier.issn1567-5394en
dc.identifier.doi10.1016/j.bioelechem.2017.09.012en
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.en
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.en
dc.publisherElsevier BVen
dc.subjectHyperthermophilic archaeaen
dc.subjectFerroglobus placidusen
dc.subjectGeoglobus ahangarien
dc.subjectHyperthermophilic MECen
dc.titleElectrical current generation in microbial electrolysis cells by hyperthermophilic archaea Ferroglobus placidus and Geoglobus ahangarien
dc.typeArticleen
dc.identifier.journalBioelectrochemistryen
dc.contributor.institutionDepartment of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA, USAen
dc.contributor.institutionDepartment of Chemical Engineering, Rochester Institute of Technology, Rochester, NY, USAen
dc.contributor.institutionDepartment of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA, USAen
dc.contributor.institutionDepartment of Biology, Western New England University, Springfield, MA, USAen
kaust.grant.numberKUS-I1-003-13en
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