کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
5144959 1379190 2018 8 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله
Electrical current generation in microbial electrolysis cells by hyperthermophilic archaea Ferroglobus placidus and Geoglobus ahangari
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Electrical current generation in microbial electrolysis cells by hyperthermophilic archaea Ferroglobus placidus and Geoglobus ahangari
چکیده انگلیسی


- Ferroglobus placidus and Geoglobus ahangari produce current at 80 and 85 °C in MECs.
- These two iron-reducing archaea were grown on acetate.
- Maximum current densities were ~ 0.6 A/m2 using graphite anodes.
- Preliminary data suggest direct electron transfer and not mediated transfer.

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.

187

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioelectrochemistry - Volume 119, February 2018, Pages 142-149
نویسندگان
, , , , ,