A novel MXene-coated biocathode for enhanced microbial electrosynthesis performance

Tahir, Khurram; Miran, Waheed; Jang, Jiseon; Shahzad, Asif; Moztahida, Mokrema; Kim, Bolam

doi:10.1016/j.cej.2019.122687

Cited by 69 publications

(29 citation statements)

References 56 publications

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“…The GS-Fe 3 O 4 @CD biohybrid could enhance the outer member conductive cytochrome expression to boost the extracellular electron transfer process, while the Fe 3 O 4 @CD conductive properties reduced the interfacial resistance between G. sulfurreducens and the anode. 38 The above results indicate that the superior bioelectrochemical activity of the GS-Fe 3 O 4 @CD biohybrid during extracellular electron transfer was due to the faradic pseudo-capacitance of Fe 3 O 4 and the faster electron transfer speed of the N-doped CDs, which might control electron flow in MEC. Uptake of N-Doped Fe 3 O 4 @CDs by G. sulfurreducens.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Enhancing Extracellular Electron Transfer of Geobacter sulfurreducens in Bioelectrochemical Systems Using N-Doped Fe₃O₄@Carbon Dots

Cheng

Xia

et al. 2022

ACS Sustainable Chem. Eng.

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A nanomaterial−living cell biohybrid system is an efficient energy conversion method due to enhanced interactions between inorganic materials and bacteria. However, inefficient electron transfer at the interface of the biohybrid remains as a limiting factor. Herein, an inorganic−biologic hybrid was proposed by combining a typical electroactive bacterium, Geobacter sulfurreducens, and a highly conductive N-doped Fe 3 O 4 with a carbon dot shell (Fe 3 O 4 @CD) to boost energy conversion in bioelectrochemical systems (including microbial electrolytic cells and electro-methanogenesis). One-potsynthesized Fe 3 O 4 @CDs enhanced extracellular electron transfer in the biohybrid system by forming an interaction network with conductive proteins inside and outside G. sulfurreducens. In the microbial electrolytic cell, the maximum current of Fe 3 O 4 @CDs-fed cells was 6.37 times higher than that of the control group without nanoparticle addition. This enhanced performance was accompanied with higher bioactivity, higher cellular adhesion, and lower biofilm resistance. The G. sulfurreducens−Fe 3 O 4 @CDs biohybrids supplemented during electro-methanogenesis remained stable on anodes, which promoted microbial syntrophy. The metabolic methanogenesis pathways are strongly related to the electron transfer ability of G. sulfurreducens, which demonstrates a new strategy to promote extracellular electron transfer through the constructed biohybrid system.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Enhancing Extracellular Electron Transfer of Geobacter sulfurreducens in Bioelectrochemical Systems Using N-Doped Fe₃O₄@Carbon Dots

Cheng

Xia

et al. 2022

ACS Sustainable Chem. Eng.

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“…A three‐electrode system and a multichannel potentiostat (wizECM‐8100 Premium, Korea) performed the analysis wherein the carbon cloth (cathode), CF/TpPa‐1@CF (anode), and saturated Ag/AgCl served as the counter, working, and reference electrodes respectively. To examine the anodic biofilm, electron mediators, and exoelectrogenic bacterial activity were characterized via CV 39 . The equilibrium between the anode and electrolyte was achieved using a fresh growth media and the analysis was employed at various scan rates ranging from 1‐200 mV/s.…”

Section: Methodsmentioning

confidence: 99%

“…To examine the anodic biofilm, electron mediators, and exoelectrogenic bacterial activity were characterized via CV. 39 The equilibrium between the anode and electrolyte was achieved using a fresh growth media and the analysis was employed at various scan rates ranging from 1-200 mV/s. By using CA for five cycles at a poised anodic potential (+200 mV vs Ag/AgCl) and suitable electrode location, the electrode stability and current density performance were evaluated.…”

Section: Electrochemical Measurements and Microbial Community Analysismentioning

confidence: 99%

Microbially catalyzed enhanced bioelectrochemical performance using covalent organic framework‐modified anode in a microbial fuel cell

Tahir

Hussain

Maile

et al. 2022

Intl J of Energy Research

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Electrode modification is crucial in improving the power density and bioelectrochemical performance of a microbial fuel cell (MFC). The conventional carbon felt (CF) surface was modified as an anode in this study to examine an emerging class of materials known as covalent organic framework (COF). In a three-electrode system, the performance of the modified anode (TpPa-1@CF) was evaluated using various physical and bioelectrochemical techniques, demonstrating superior bioelectrochemical activity (cyclic voltammetry), reduced electrode resistance (electrochemical spectroscopy), and excellent electrode stability (chronoamperometry). With a 4.3 and 12.7-fold improvement in power (1069 mW/m 2 ) and current (1954 mA/m 2 ) density and steady MFC performance as compared to the uncoated electrode throughout five MFC cycles, TpPa-1@CF demonstrated better bioelectrochemical activity. Furthermore, the rough electrode surface area and numerous catalytically active sites of TpPa-1@CF promoted the microbial growth/adhesion along with substrate fluxes yielding the selective enrichment of Proteobacteria and Bacteroidetes (electricity-producing phyla). These results indicated that TpPa-1@CF is a promising anode material for several bioelectrochemical applications.

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“…185 Carbon capture requires the selective adsorption 62,186,187 of carbon dioxide over MXenes. 188,189 Furthermore, the catalytic reduction of CO 2 into useful products 190,191 has been greatly investigated through the MXene-based photocatalysts, 192−194 bioelectrochemical synthesis, 195 and electrocatalysts. 196,197 MXene-based heterostructures may provide excellent materials for carbon neutrality.…”

Section: ■ Regulation Of Atomic-scale Active Sitesmentioning

confidence: 99%

Potential of MXene-Based Heterostructures for Energy Conversion and Storage

et al. 2021

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A novel MXene-coated biocathode for enhanced microbial electrosynthesis performance

Cited by 69 publications

References 56 publications

Enhancing Extracellular Electron Transfer of Geobacter sulfurreducens in Bioelectrochemical Systems Using N-Doped Fe₃O₄@Carbon Dots

Enhancing Extracellular Electron Transfer of Geobacter sulfurreducens in Bioelectrochemical Systems Using N-Doped Fe₃O₄@Carbon Dots

Microbially catalyzed enhanced bioelectrochemical performance using covalent organic framework‐modified anode in a microbial fuel cell

Potential of MXene-Based Heterostructures for Energy Conversion and Storage

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A novel MXene-coated biocathode for enhanced microbial electrosynthesis performance

Cited by 69 publications

References 56 publications

Enhancing Extracellular Electron Transfer of Geobacter sulfurreducens in Bioelectrochemical Systems Using N-Doped Fe3O4@Carbon Dots

Enhancing Extracellular Electron Transfer of Geobacter sulfurreducens in Bioelectrochemical Systems Using N-Doped Fe3O4@Carbon Dots

Microbially catalyzed enhanced bioelectrochemical performance using covalent organic framework‐modified anode in a microbial fuel cell

Potential of MXene-Based Heterostructures for Energy Conversion and Storage

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Enhancing Extracellular Electron Transfer of Geobacter sulfurreducens in Bioelectrochemical Systems Using N-Doped Fe₃O₄@Carbon Dots

Enhancing Extracellular Electron Transfer of Geobacter sulfurreducens in Bioelectrochemical Systems Using N-Doped Fe₃O₄@Carbon Dots