Electrical current generation in microbial electrolysis cells by hyperthermophilic archaea Ferroglobus placidus and Geoglobus ahangari
| Autor: | Bruce E. Logan, Yasemin Dilsad Yilmazel, Xiuping Zhu, Dawn E. Holmes, Kyoung Yeol Kim |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Microorganism 030106 microbiology Biophysics Electrochemistry Electrolysis Archaeoglobaceae law.invention Microbiology 03 medical and health sciences law Physical and Theoretical Chemistry biology Thermophile Biofilm Electric Conductivity Temperature General Medicine biology.organism_classification Chemical engineering Biofilms Archaeoglobales Cyclic voltammetry Archaea |
| Zdroj: | Bioelectrochemistry (Amsterdam, Netherlands). 119 |
| ISSN: | 1878-562X |
| Popis: | 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±0.11A/m2 was attained in F. placidus MECs at 85°C, and 0.57±0.10A/m2 in G. ahangari MECs at 80°C, with an applied voltage of 0.7V. Cyclic voltammetry (CV) showed that both strains produced a sigmoidal catalytic wave, with a mid-point potential of -0.39V (vs. Ag/AgCl) for F. placidus and -0.37V 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect