Recent Advances on Electrochemical Sensors Based on Electroactive Bacterial Systems for Toxicant Monitoring: A Minireview

Haddour, Naoufel; Azri, Yamina Mounia

doi:10.1002/elan.202200202

Cited by 6 publications

(2 citation statements)

References 159 publications

(162 reference statements)

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“…The electrons released during substrate oxidation at the anode are transferred to the cathode, typically via an oxygen reduction reaction. Despite the potential of MFCs for wastewater treatment and power generation, their real-world application remains limited due to challenges such as low power densities [5,6]. One of the primary factors influencing MFC performance is the efficiency of extracellular electron transfer (EET) at the anode, which is determined by the properties of the anode material [7].…”

Section: Introductionmentioning

confidence: 99%

Untreated vs. Treated Carbon Felt Anodes: Impacts on Power Generation in Microbial Fuel Cells

Ghanam,

Cecillon,

Sabac

et al. 2023

Micromachines

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This research sought to enhance the efficiency and biocompatibility of anodes in bioelectrochemical systems (BESs) such as microbial fuel cells (MFCs), with an aim toward large-scale, real-world applications. The study focused on the effects of acid-heat treatment and chemical modification of three-dimensional porous pristine carbon felt (CF) on power generation. Different treatments were applied to the pristine CF, including coating with carbon nanofibers (CNFs) dispersed using dodecylbenzene sulfonate (SDBS) surfactant and biopolymer chitosan (CS). These processes were expected to improve the hydrophilicity, reduce the internal resistance, and increase the electrochemically active surface area of CF anodes. A high-resolution scanning electron microscopy (HR-SEM) analysis confirmed successful CNF coating. An electrochemical analysis showed improved conductivity and charge transfer toward [Fe(CN)6]3−/4− redox probe with treated anodes. When used in an air cathode single-chamber MFC system, the untreated CF facilitated quicker electroactive biofilm growth and reached a maximum power output density of 3.4 W m−2, with an open-circuit potential of 550 mV. Despite a reduction in charge transfer resistance (Rct) with the treated CF anodes, the power densities remained unchanged. These results suggest that untreated CF anodes could be most promising for enhancing power output in BESs, offering a cost-effective solution for large-scale MFC applications.

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Section: Introductionmentioning

confidence: 99%

Untreated vs. Treated Carbon Felt Anodes: Impacts on Power Generation in Microbial Fuel Cells

Ghanam,

Cecillon,

Sabac

et al. 2023

Micromachines

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“…Microbial fuel cell (MFC) technology employs electroactive bacteria (EAB) as biocatalysts to generate electricity through the oxidation of organic compounds. This technology has various applications under development, such as sustainable energy production for wastewater treatment and biosensors for monitoring dissolved organic carbon and toxic pollutants [1,2]. The selection of EAB during biofilm formation on the anode is critical for enhancing MFC performance.…”

Section: Introductionmentioning

confidence: 99%

Influence of Hydrodynamic Forces on Electroactive Bacterial Adhesion in Microbial Fuel Cell Anodes

Godain,

Vogel,

Fongarland

et al. 2023

Bioengineering

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This investigation examined the role of shear stress on the dynamic development of microbial communities within anodic biofilms in single-chamber microbial fuel cells (MFCs). Bacterial attachment to surfaces, often regarded as a crucial step in biofilm formation, may significantly contribute to the selection of electroactive bacteria (EAB). It is well established that hydrodynamic forces, particularly shear forces, have a profound influence on bacterial adhesion. This study postulates that shear stress could select EAB on the anode during the adhesion phase by detaching non-EAB. To examine this hypothesis, MFC reactors equipped with a shear stress chamber were constructed, creating specific shear stress on the anode. The progression of adhesion under various shear stress conditions (1, 10, and 50 mPa) was compared with a control MFC lacking shear stress. The structure of the microbial community was assessed using 16S rRNA gene (rrs) sequencing, and the percentage of biofilm coverage was analyzed using fluorescence microscopy. The results indicate a significant impact of shear stress on the relative abundance of specific EAB, such as Geobacter, which was higher (up to 30%) under high shear stress than under low shear stress (1%). Furthermore, it was noted that shear stress decreased the percentage of biofilm coverage on the anodic surface, suggesting that the increase in the relative abundance of specific EAB occurs through the detachment of other bacteria. These results offer insights into bacterial competition during biofilm formation and propose that shear stress could be utilized to select specific EAB to enhance the electroactivity of anodic biofilms. However, additional investigations are warranted to further explore the effects of shear stress on mature biofilms.

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Influence of shear stress on electroactive biofilm characteristics and performance in microbial fuel cells

Godain,

Vogel,

Fongarland

et al. 2024

Biosensors and Bioelectronics

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Recent Advances on Electrochemical Sensors Based on Electroactive Bacterial Systems for Toxicant Monitoring: A Minireview

Cited by 6 publications

References 159 publications

Untreated vs. Treated Carbon Felt Anodes: Impacts on Power Generation in Microbial Fuel Cells

Untreated vs. Treated Carbon Felt Anodes: Impacts on Power Generation in Microbial Fuel Cells

Influence of Hydrodynamic Forces on Electroactive Bacterial Adhesion in Microbial Fuel Cell Anodes

Influence of shear stress on electroactive biofilm characteristics and performance in microbial fuel cells

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