Enhanced bioelectricity generation in thermophilic microbial fuel cell with lignocellulose as an electron donor by resazurin-mediated electron transfer

[Display omitted] •The IET/EET pathway of Acetivibrio thermocellus DSM 1313 was elucidated.•Thermophilic MFC with direct lignocellulose as an electron donor was established.•Resazurin decreased the impedance of the MFC and enhanced power density by 260.25%. Microbial fuel cell (MFC) with lignocellul...

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Bibliographic Details
Published in:Bioresource technology 2023-11, Vol.388, p.129764-129764, Article 129764
Main Authors: Yan, Xing, Zhu, Ming-Jun
Format: Article
Language:English
Subjects:
Acetivibrio
anodes
bioelectricity
Bioelectricity generation
biomass
biorefining
dielectric spectroscopy
electric potential difference
electrochemistry
electron transfer
electron transport chain
lignocellulose
Lignocellulose degradation
Mediated electron transfer
microbial fuel cells
redox potential
Resazurin
Thermophilic microbial fuel cell
voltammetry
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Summary:[Display omitted] •The IET/EET pathway of Acetivibrio thermocellus DSM 1313 was elucidated.•Thermophilic MFC with direct lignocellulose as an electron donor was established.•Resazurin decreased the impedance of the MFC and enhanced power density by 260.25%. Microbial fuel cell (MFC) with lignocellulose as an electron donor is considered a sustainable biorefinery. However, low lignocellulose degradation and energy output restrict the scale of application. Herein, the extracellular electron transfer (EET) capacity of Acetivibrio thermocellus DSM 1313 with lignocellulose as substrate was shown to be mediated by the self-produced flavin, and its intracellular electron transfer went through the whole respiratory chain. Thermophilic MFC with resazurin exhibited an increase in the open circuit voltage by 37.78%, and a 2.60 folds increase in power density of 77.85 mW/m2, respectively. Differential pulse voltammetry and electrochemical impedance spectroscopy analysis indicated that resazurin decreased the solution and anode charge transfer resistance, and enhanced the extracellular electrochemical activity. Furthermore, resazurin resulted in a lower redox potential, allowing preferential electron transfer to resazurin rather than flavin. This research establishes a resazurin-mediated thermophilic MFC with lignocellulose as substrate, which provides novel idea on the biomass refinery.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2023.129764