Graphene Oxide/Carbon Nanotube Composite Hydrogels—Versatile Materials for Microbial Fuel Cell Applications

kumar, G. Gnana; Hashmi, Saud; Karthikeyan, Chandrasekaran; GhavamiNejad, Amin; Vatankhah‐Varnoosfaderani, Mohammad; Stadler, Florian J.

doi:10.1002/marc.201400332

Cited by 103 publications

(42 citation statements)

References 29 publications

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“…8 At present, more and more choices have got to fabricate or modify the electrode of MFCs, with nanomaterials, nanocomposites, graphene sheet and graphene oxides owing to their high surface area, porosity and prompt electron conduction properties. [9][10][11][12][13] The results showed that the electrodes fabricated or modied by nonamaterials exhibited excellent electrochemical activity. Signicant redox peaks have found in cyclic voltammograms and electricity production of the MFCs also obtained.…”

Section: 4-6mentioning

confidence: 83%

Interaction of bacteria and archaea in a microbial fuel cell with ITO anode

et al. 2018

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A microbial fuel cell with an indium tin oxide (ITO) coated glass anode was used to study the mechanism of electricity generation and electron transfer of electrochemically active microbes (EAMs). A simple method of ITO anode pretreatment (pickling) was developed to improve the performance of the microbial fuel cell.After proper treatment, ITO-glass anodes maintained their conductivity with a slight increase in resistance.Using this pickling pretreatment, the ITO-glass microbial fuel cell with an anode area of only 8.3 cm 2 , was successfully initiated and obtained a stable voltage and power output of 418.8 mW m À2 . The electrode material with pretreatment showed optimal performance for the in situ study of EAMs. DNA was extracted from various parts of the reactor and the microbial communities were analyzed. The results indicated that the large proportion of methane-related microbes on the cathode of the MFC was one of the reasons for its high COD removal and low columbic efficiency. ITO glass is suitable as an anode material for the in situ study of EAMs, and shows potential for practical application.Microbial fuel cells (MFCs) are one type of "green energy generating" device that is able to convert the chemical energy of organic matter into electrical energy.1 The process of conversion from chemical energy to electrical energy takes place during wastewater treatment using MFCs. This type of device utilizes microorganisms as the biocatalyst and has attracted a great deal of attention from researchers around the world. 1-4Studies of MFCs have been mainly focused in a few specic areas: increasing the efficiency of converting organic matter into electrical energy, reducing the cost of assembling the reactors, and the mechanism of MFCs that converts chemical energy into electrical energy. 2,4-6In the rst step of energy conversion, microorganisms at the MFC anode consume organic matter from their growth medium and release electrons.7 To study this critical step involving the anode, the microorganisms located their, and their mechanism of electron deposition, it is necessary to choose proper anodic materials. 8At present, more and more choices have got to fabricate or modify the electrode of MFCs, with nanomaterials, nanocomposites, graphene sheet and graphene oxides owing to their high surface area, porosity and prompt electron conduction properties.9-13 The results showed that the electrodes fabricated or modied by nonamaterials exhibited excellent electrochemical activity. Signicant redox peaks have found in cyclic voltammograms and electricity production of the MFCs also obtained.To harvest the largest columbic efficiencies and chemical oxygen demand (COD) removal efficiencies, most MFC anodes are carbon-felt brushes with a large surface area.

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Section: 4-6mentioning

confidence: 83%

Interaction of bacteria and archaea in a microbial fuel cell with ITO anode

et al. 2018

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“…conductivity, good chemical tolerance, and high thermal stability, which may be advantageous for the energy storage devices [33]. The current large-scale production of graphene involves the chemical exfoliation of graphite in strong acids and the resulting contains heavily oxygenated graphene sheets bearing epoxy and hydroxyl functional groups on their basal planes and carbonyl and carboxyl groups on the The aforementioned oxygen labile functional groups act as nucleation sites for the growth of nanaoparticles.…”

Section: Methodsmentioning

confidence: 99%

Cobaltite oxide nanosheets anchored graphene nanocomposite as an efficient oxygen reduction reaction (ORR) catalyst for the application of lithium-air batteries

kumar

Christy

Jang

et al. 2015

Journal of Power Sources

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“…Its single atomic layer of graphite allows it to have higher electric conductivity than conventional carbon materials [33]. Despite the excellent features of graphene, there are few examples of its use in METs [34,35]. The electroactivity in stationary cells of G. sulfurreducens using graphene SPEs was also tested in this work, which resulted in a considerably increase of the signal intensity in contrast to carbon SPEs ( Figure 3B).…”

Section: Screen-printed Electrodes (Spes): Testing Electroactivity Inmentioning

confidence: 95%

Screen-Printed Electrodes: New Tools for Developing Microbial Electrochemistry at Microscale Level

et al. 2015

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Abstract:Microbial electrochemical technologies (METs) have a number of potential technological applications. In this work, we report the use of screen-printed electrodes (SPEs) as a tool to analyze the microbial electroactivity by using Geobacter sulfurreducens as a model microorganism. We took advantage of the small volume required for the assays (75 µL) and the disposable nature of the manufactured strips to explore short-term responses of microbial extracellular electron transfer to conductive materials under different scenarios. The system proved to be robust for identifying the bioelectrochemical response, while avoiding complex electrochemical setups, not available in standard biotechnology laboratories. We successfully validated the system for characterizing the response of Geobacter sulfurreducens in different physiological states (exponential phase, stationary phase, and steady state under continuous culture conditions) revealing different electron transfer responses. Moreover, a combination of SPE and G. sulfurreducens resulted to be a promising biosensor for quantifying the levels of acetate, as well as for performing studies in real wastewater. In addition, the potential of the technology for identifying electroactive consortia was tested, as an example, with a mixed population with nitrate-reducing capacity. We therefore present SPEs as a novel low-cost platform for assessing microbial electrochemical activity at the microscale level.

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Graphene Oxide/Carbon Nanotube Composite Hydrogels—Versatile Materials for Microbial Fuel Cell Applications

Cited by 103 publications

References 29 publications

Interaction of bacteria and archaea in a microbial fuel cell with ITO anode

Interaction of bacteria and archaea in a microbial fuel cell with ITO anode

Cobaltite oxide nanosheets anchored graphene nanocomposite as an efficient oxygen reduction reaction (ORR) catalyst for the application of lithium-air batteries

Screen-Printed Electrodes: New Tools for Developing Microbial Electrochemistry at Microscale Level

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