Graphene-containing thin films prepared by calcination of polyaniline/montmorillonite nanocomposite

Tokarský, Jonáš; Kulhánková, Lenka; Peikertová, Pavlína; Vilímová, Petra; Beňo, Jaroslav

doi:10.1016/j.tsf.2017.01.065

Cited by 6 publications

(6 citation statements)

References 39 publications

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“…20 The peaks of Si−OH (1635 cm −1 ) and carboxylic acids (1627 cm −1 ) underwent a slight red-shift, and the hydrogen bonding (3410 cm −1 ) between Si−OH and carboxylic acids increased in strength. 23,42,43 A new characteristic peak appeared at 943 cm −1 , which was assigned to C−O−Si due to the hydroxyl condensation between GO and MMT. 35 The above analysis demonstrates the successful incorporation of GO into the mMMT sheets, accompanied by the exposure of additional oxygen-containing functional groups.…”

Section: Characterization Of Go@mmmt Layered Compositesmentioning

confidence: 99%

“…Among these, hybrid composite Nafion membranes containing mineral particles have been proposed. − As a representative two-dimensional (2D) lamellar silicate mineral, montmorillonite (MMT) is composed of two layers of Si–O tetrahedral sheets and one layer of octahedral Al (Mg)–O. , Because of isomorphic substitution in MMT layers, its crystal structure is negatively charged, allowing these 2D clays to attract countercations, including Na + , Ca 2+ , and hydronium ions to compensate for the extra charges . MMT is commonly utilized in PEMs because it can provide the desired mechanical properties, proton conductivity, and resistance to methanol permeation. ,,− Although the water retention of mineral particles improves the proton conductivity, they easily aggregate when added to PEMs due to interfacial forces, which may deteriorate the performance of composite membranes.…”

Section: Introductionmentioning

confidence: 99%

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Graphene Oxide-Intercalated Microbial Montmorillonite to Moderate the Dependence of Nafion-Based PEMFCs in High-Humidity Environments

Meng

Zou

et al. 2023

ACS Appl. Energy Mater.

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The most fatal disadvantage of Nafion-based proton-exchange membrane fuel cells (PEMFCs) is their significant performance losses at low relative humidities (RH ≤ 80%), making external humidification necessary. In this work, a graphene oxide (GO)-intercalated microbial montmorillonite (mMMT) layered stack (GO@mMMT) was prepared to enhance the proton conductivity of a Nafion membrane under a low humidity at elevated temperatures. The prepared mMMT had a high specific surface area and pore volume due to microbial mineralization, allowing GO to act as a spacer intercalated between MMT layers. This layered stack greatly enhanced the water absorbance and retention capacity of GO@mMMT/Nafion composite membranes. The GO@mMMT/Nafion composite membrane exhibited excellent proton conductivity under various humidities. Particularly, the 0.5GO@mMMT/Nafion sample achieved a proton conductivity of 36.4 mS·cm–1 at 80 °C/98% RH and 17.3 mS·cm–1 at 80 °C/20% RH, which was 82% and 188% higher than that of the recast Nafion membrane, respectively. The assembled single cell reached a peak power density of 546 mW·cm–2, which was 60% higher than that of the recast Nafion single cell. These results indicate that the Nafion composite membranes with GO@mMMT incorporated layered stacks show substantial potential for PEMFC applications with simplified water management.

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Section: Characterization Of Go@mmmt Layered Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Graphene Oxide-Intercalated Microbial Montmorillonite to Moderate the Dependence of Nafion-Based PEMFCs in High-Humidity Environments

Meng

Zou

et al. 2023

ACS Appl. Energy Mater.

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“…A study had compared the conductivity performance between calcined and uncalcined polyaniline. 171 The calcination of membrane was operated under argon atmosphere at 1300 C, and in fact to prepare graphene/aluminosilicate thin film as well. The formation of graphene was confirmed from polyaniline chains in the MMT interlayer space by Raman spectroscopy which resulting to have high electrical conductivity (9324 S/m), five times greater than the uncalcined PANI/ MMT thin film (396 S/m).…”

Section: Pem-based With Montmorillonite As a Conductive Fillermentioning

confidence: 99%

“…Polyaniline (PANI) had become a good PEM compatible with MMT. A study had compared the conductivity performance between calcined and uncalcined polyaniline 171 . The calcination of membrane was operated under argon atmosphere at 1300°C, and in fact to prepare graphene/aluminosilicate thin film as well.…”

Section: Literature Studies On Membrane Fuel Cell Containing Cnt Go mentioning

confidence: 99%

Carbon nanotube, graphene oxide and montmorillonite as conductive fillers in polymer electrolyte membrane for fuel cell: an overview

2020

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Summary This study discusses three conductive materials—carbon nanotube, graphene oxide, and montmorillonite which recently being used as fillers in membranes of fuel cell application and commonly hybridized with polymers as the matrix. The polymer electrolyte membrane fuel cell (PEMFC) is using a polymer‐based membrane as the electrolyte, which might require filler or functionalization to enhance their cell performance. This review provides brief information for the researcher who insists on improving the current PEM using these potential fillers, specified with required values of membrane properties measurement. It also entails the special features of the nanofillers concerning their chemical structure and electrochemical properties based on recent studies. As electricity is generated from an external fuel source, the membranes that are used should be more than 0.1 S/cm of proton conductivity, low fuel permeability (< 1.37 x 10−6 cm2/s), cheap, and high stability in dry and wet condition. PEM is widely being utilized together with filler(s) incorporated as a purpose to overcome recent drawbacks encountered by the commercial Nafion membrane solely. Hence, the fillers embedded in the membrane are necessarily to have the promising characteristics, acknowledging the potential performances of three conductive nanofillers of (a) carbon nanotubes which is well‐known of its electrical conducting potential with three cylindrical design, (b) graphene oxide which is a reactive carbonaceous material with its multifunctional groups and (c) montmorillonite which is one of the clay types that has tetrahedral and octahedral layers of alumina‐silicates for producing better hybrid polymer electrolyte membrane. Highlights Carbon nanotube, graphene oxide, and montmorillonite are highly promising conductive fillers with outstanding cell performances based on previous studies. Carbon nanotube, graphene oxide, and montmorillonite are chosen as incorporated fillers recently due to their rolling up direction (chirality vector of graphene sheet), reactive functional groups attached on the carbon atoms and ionic multilayers of the tetrahedral and octahedral sheet, respectively. High proton conductivity, low electronic conductivity, low fuel permeability, low water transport, low production cost, and high mechanical stability in both dry and wet condition are properties that should be portrayed by a good hybrid membrane.

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“…In the present paper, Tyr based capacitive biosensor has been prepared for dopamine detection with high selectivity. In this study, biocompatible polymers such as polyaniline (PANI), cellulose nanocrystals (CNC) and carbon nanotubes (CNTs) have been selected to provide enzyme support and to enhance signal transduction [33–38] . During biosensor fabrication, Tyr was immobilized by drop‐casting onto the pre‐fabricated solid support of PANI/CNTs/CNC modified polyvinyl acetate (PVA) surface.…”

Section: Introductionmentioning

confidence: 99%

Disposable Capacitive Biosensor for Dopamine Sensing

Dhanjai

Mugo

2020

ChemistrySelect

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The present paper reports fabrication of a disposable tyrosinase (Tyr) biosensor for rapid detection of dopamine. Tyr immobilized polyaniline/carbon nanotubes/cellulose nanocrystals (Tyr@PANI/CNTs/CNC) conductive film was fabricated on polyvinyl acetate (PVA) transparency and characterized by scanning electron microscopy (SEM) and cyclic voltammetry (CV). Tyr catalyzed dopamine oxidation to o‐dopaquinone was analysed by CV and capacitance was recorded. PANI/CNTs/CNC film acted as a suitable enzyme support which also showed its synergistic effect in accelerating the biocatalytic oxidation reaction. Tyr biosensor exhibited excellent reproducibility, and specificity towards dopamine with correlation coefficient (R2) of 0.9508 and limit of detection (LOD) of 1.57 nM within linear concentration range of 7–1000 mM. The study suggested practical utilization of disposable biosensor towards dopamine detection in biological fluids.

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Graphene-containing thin films prepared by calcination of polyaniline/montmorillonite nanocomposite

Cited by 6 publications

References 39 publications

Graphene Oxide-Intercalated Microbial Montmorillonite to Moderate the Dependence of Nafion-Based PEMFCs in High-Humidity Environments

Graphene Oxide-Intercalated Microbial Montmorillonite to Moderate the Dependence of Nafion-Based PEMFCs in High-Humidity Environments

Carbon nanotube, graphene oxide and montmorillonite as conductive fillers in polymer electrolyte membrane for fuel cell: an overview

Disposable Capacitive Biosensor for Dopamine Sensing

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