Bacterial electroactivity and viability depends on the carbon nanotube-coated sponge anode used in a microbial fuel cell

Ma, Hanyue; Xia, Tian; Bian, Congcong; Sun, Huihui; Liu, Zhuang; Wu, Chao; Wang, Xia; Xu, Ping

doi:10.1016/j.bioelechem.2018.02.008

Cited by 18 publications

(7 citation statements)

References 35 publications

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“…To enhance the conversion efficiency of MFCs, several factors need to be considered, including oxidation of substrates, electron transfer and microbe attachment. [55] Despite the good biocompatibility and conductivity of conventional carbon materials, their limited electrocatalytic activities and specific capacitance hinder their applications. [56] Instead, carbon materials with nano-structures possess the following merits -large surface area, high mechanical robustness, fast charge transport and admirable biocompatibility.…”

Section: Carbon Anodes Based On Carbon Nanotubes (Cnts) and Graphenementioning

confidence: 99%

“…CNTs are featured with the high specific surface area, good electrical conductivity and high mechanical strength, so they are often adopted as the standalone material or the additives in the MFC anodes. [55,[68][69][70][71][72][73][74][75][76] Modified with functional groups, the power densities will be enhanced. For example, the current generation was improved for carboxylic acid-decorated CNT anodes due to the strong hydrogen bonding formed between peptide bonds of proteins and À COOH terminal groups, thus increasing the attachment of microbes.…”

Section: Cnt-based Mfc Anodementioning

confidence: 99%

“…[68,80,81] Apart from the previously mentioned CNT-SS sponge material, CNTs were also coated on the polyurethane to form a 3D porous structure, delivering a maximum power density of 787 W m À 3 at an optimal CNT concentration of 30 mg mL À 1 , which strikes a balance between good biocompatibility and fast electron transfer. [55] In addition to the mechanical strength and biocompatibility, chitosan (CS) with an admirable capacitive property (similar with AC) could lower the charge transfer resistance when coated by CNTs to generate a 3D sponge porous anode in MFC. Together with the large contact area between the bacteria and anode materials which promoted the growth of microbes, the electricity generated was enhanced by 67 % [82] and an excellent power output of 1776.6 mW m À 2 was presented.…”

Section: Cnt-based Mfc Anodementioning

confidence: 99%

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Carbon‐Based Composites as Anodes for Microbial Fuel Cells: Recent Advances and Challenges

et al. 2021

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site). The relationship is demonstrated in depth between the physicochemical properties of the anode surface/interface/bulk (porosity, surface area, hydrophilicity, partical size, charge, roughness, etc.) and the bioelectrochemical performances (electron transfer, electrolyte diffusion, capacitance, toxicity, start-up time, current, power density, voltage, etc.). An outlook for future work is also proposed.

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Section: Carbon Anodes Based On Carbon Nanotubes (Cnts) and Graphenementioning

confidence: 99%

Section: Cnt-based Mfc Anodementioning

confidence: 99%

Section: Cnt-based Mfc Anodementioning

confidence: 99%

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Carbon‐Based Composites as Anodes for Microbial Fuel Cells: Recent Advances and Challenges

et al. 2021

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“…MFCs are kind of microbial electrochemical systems that use EAB in the anode as catalysts to convert chemical energy from organic matter into electricity [ 1 – 3 ]. Moreover, both electrodes of MFCs and Fe(III) oxides can act as extracellular electron receptors that receive electrons generated during EAB metabolism and are reduced.…”

Section: Introductionmentioning

confidence: 99%

Effects of biofilm transfer and electron mediators transfer on Klebsiella quasipneumoniae sp. 203 electricity generation performance in MFCs

Guo

Wang

Zhang

et al. 2020

Biotechnol Biofuels

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Background Extracellular electron transfer (EET) is essential in improving the power generation performance of electrochemically active bacteria (EAB) in microbial fuel cells (MFCs). Currently, the EET mechanisms of dissimilatory metal-reducing (DMR) model bacteria Shewanella oneidensis and Geobacter sulfurreducens have been thoroughly studied. Klebsiella has also been proved to be an EAB capable of EET, but the EET mechanism has not been perfected. This study investigated the effects of biofilm transfer and electron mediators transfer on Klebsiella quasipneumoniae sp. 203 electricity generation performance in MFCs. Results Herein, we covered the anode of MFC with a layer of microfiltration membrane to block the effect of the biofilm mechanism, and then explore the EET of the electron mediator mechanism of K. quasipneumoniae sp. 203 and electricity generation performance. In the absence of short-range electron transfer, we found that K. quasipneumoniae sp. 203 can still produce a certain power generation performance, and coated-MFC reached 40.26 mW/m2 at a current density of 770.9 mA/m2, whereas the uncoated-MFC reached 90.69 mW/m2 at a current density of 1224.49 mA/m2. The difference in the electricity generation performance between coated-MFC and uncoated-MFC was probably due to the microfiltration membrane covered in anode, which inhibited the growth of EAB on the anode. Therefore, we speculated that K. quasipneumoniae sp. 203 can also perform EET through the biofilm mechanism. The protein content, the integrity of biofilm and the biofilm activity all proved that the difference in the electricity generation performance between coated-MFC and uncoated-MFC was due to the extremely little biomass of the anode biofilm. To further verify the effect of electron mediators on electricity generation performance of MFCs, 10 µM 2,6-DTBBQ, 2,6-DTBHQ and DHNA were added to coated-MFC and uncoated-MFC. Combining the time–voltage curve and CV curve, we found that 2,6-DTBBQ and 2,6-DTBHQ had high electrocatalytic activity toward the redox reaction of K. quasipneumoniae sp. 203-inoculated MFCs. It was also speculated that K. quasipneumoniae sp. 203 produced 2,6-DTBHQ and 2,6-DTBBQ. Conclusions To the best of our knowledge, the three modes of EET did not exist separately. K. quasipneumoniae sp.203 will adopt the corresponding electron transfer mode or multiple ways to realize EET according to the living environment to improve electricity generation performance.

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“…MFCs are kind of microbial electrochemical systems that use EAB in the anode as catalysts to convert chemical energy from organic matter into electricity [1][2][3]. Moreover, both electrodes of MFCs and Fe ( III ) oxides can act as extracellular electron receptors that receive electrons generated during EAB metabolism and are reduced.…”

Section: Introductionmentioning

confidence: 99%

Effects of Biofilm Transfer and Electron Mediators Transfer on Klebsiella quasipneumoniae sp.203 Electricity Generation Performance in MFCs

Guo

Wang

Zhang

et al. 2020

Preprint

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Background: Extracellular electron transfer ( EET ) is essential in improving the power generation performance of electrochemically active bacteria ( EAB ) in microbial fuel cells ( MFCs ) . Currently, the EET mechanisms of dissimilatory metal-reducing ( DMR ) model bacteria Shewanella oneidensis and Geobacter sulfurreducens have been thoroughly studied. Klebsiella has also been proved to be an EAB capable of EET, but the EET mechanism has not been perfected. This study investigated the effects of biofilm transfer and electron mediators transfer on Klebsiella quasipneumoniae sp. 203 electricity generation performance in MFCs. Results： Herein, we covered the anode of MFC with a layer of microfiltration membrane to block the effect of the biofilm mechanism, and then explore the EET of the electron mediator mechanism of K.quasipneumoniae sp. 203 and electricity generation performance. In the absence of short-range electron transfer, we found that K.quasipneumoniae sp. 203 can still produce a certain power generation performance, and coated-MFC reached 40.26 mW / m 2 at a current density of 770.9 mA / m 2 whereas the uncoated-MFC reached 90.69 mW / m 2 at a current density of 1224.49 mA / m 2 . The difference in the electricity generation performance between coated-MFC and uncoated-MFC was probably due to the microfiltration membrane covered in anode, which inhibited the growth of EAB on the anode. Therefore, we speculated that K.quasipneumoniae sp. 203 can also perform EET through the biofilm mechanism. The protein content, the integrity of biofilm and the biofilm activity all proved that the difference in the electricity generation performance between coated-MFC and uncoated-MFC was due to the extremely little biomass of the anode biofilm. To further verify the effect of electron mediators on electricity generation performance of MFCs, 10µM 2,6-DTBBQ, 2,6-DTBHQ and DHNA were added to coated-MFC and uncoated-MFC. Combining the time-voltage curve and CV curve, we found that 2,6-DTBBQ and 2,6-DTBHQ had high electrocatalytic activity toward the redox reaction of K.quasipneumoniae sp.203-inoculated MFCs. It was also speculated that K. quasipneumoniae sp. 203 produced 2,6-DTBHQ and 2,6-DTBBQ. Conclusions: To the best of our knowledge, the three modes of EET did not exist separately. K.quasipneumoniae sp.203 will adopt the corresponding electron transfer mode or multiple ways to realize EET according to the living environment to improve electricity generation performance.

show abstract

Bacterial electroactivity and viability depends on the carbon nanotube-coated sponge anode used in a microbial fuel cell

Cited by 18 publications

References 35 publications

Carbon‐Based Composites as Anodes for Microbial Fuel Cells: Recent Advances and Challenges

Carbon‐Based Composites as Anodes for Microbial Fuel Cells: Recent Advances and Challenges

Effects of biofilm transfer and electron mediators transfer on Klebsiella quasipneumoniae sp. 203 electricity generation performance in MFCs

Effects of Biofilm Transfer and Electron Mediators Transfer on Klebsiella quasipneumoniae sp.203 Electricity Generation Performance in MFCs

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