Bio-functionalized hybrid nanocomposite membranes for direct methanol fuel cells

Mohanapriya, S.; Rambabu, Gutru; Suganthi, Sanjeevamuthu; Bhat, Santoshkumar D.; Vasanthkumar, V.; Anbarasu, V.; Raj, V.

doi:10.1039/c6ra04098e

Cited by 26 publications

(12 citation statements)

References 56 publications

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“…The ester linkages and additional hydrogen bonds present within the cross-linked PVA structures are gradually degraded in the range of 160 °C. In this zone, all cross-linked PVA films are relatively stable, indicating that the thermal energy is not sufficient to break the ester linkages resulting from the reaction between the hydroxyl groups of the PVA and the carboxylic group of OA, hindering facile degradation (Mohanapriya et al 2016). Among the three cross-linked PVA networks, PVA/LA demonstrates the highest thermal stability because of the presence of functional groups that can actively participate in inter/intramolecular hydrogen bonding caused by the spatial proximity of the -COOH and -OH groups.…”

Section: Thermal Stabilitymentioning

confidence: 99%

Fabrication of PVA polymer films with improved antibacterial activity by fine-tuning via organic acids for food packaging applications

et al. 2020

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In this study, organic acids were used as cross-linker with polyvinyl alcohol (PVA) films prepared by a solution-casting method for food packing applications. The effect of incorporating three different organic acids, i.e., malic acid (MA), tartaric acid (TA), and lactic acid (LA), on the physicochemical and biological properties of PVA was explored in detail. The crystalline phase, optical absorption, and functional groups were examined via UV-Vis and Fourier transform infrared spectroscopy. Thermal, microstructural, and surface investigations were conducted by thermogravimetric analysis and scanning electron microscopy, and the antibacterial activity was evaluated. The surface topography and roughness were found to have a strong effect on the bactericidal properties of the films, as confirmed by atomic force microscopy. Among the considered films, PVA/LA exhibited the highest bacterial inhibition, which was largely due to its capacity to modify the local pH and alter the permeability of the microbial layer by disrupting bacteria-substrate interaction. In general, the composite film was found to have attractive properties and can be considered as a food packaging material with low environmental impact based on polyvinyl alcohol.

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Section: Thermal Stabilitymentioning

confidence: 99%

Fabrication of PVA polymer films with improved antibacterial activity by fine-tuning via organic acids for food packaging applications

et al. 2020

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“…On the other hand, amino acid forms electrostatic interactions with water molecules and held between –NH 2 + – and –COO − groups. These bridged water molecules form a hydration layer in the composite membrane acting as a vehicle for proton transport [111]. Thus, a small quantity of amino acid functionalized GO (1 wt.% in relation to SPEEK) brings significant improvement in proton conductivity.…”

Section: Carbon Nanomaterials As Additives In Pemsmentioning

confidence: 99%

Carbon Nanocomposite Membrane Electrolytes for Direct Methanol Fuel Cells—A Concise Review

2019

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A membrane electrolyte that restricts the methanol cross-over while retaining proton conductivity is essential for better electrochemical selectivity in direct methanol fuel cells (DMFCs). Extensive research carried out to explore numerous blends and composites for application as polymer electrolyte membranes (PEMs) revealed promising electrochemical selectivity in DMFCs of carbon nanomaterial-based polymer composites. The present review covers important literature on different carbon nanomaterial-based PEMs reported during the last decade. The review emphasises the proton conductivity and methanol permeability of nanocomposite membranes with carbon nanotubes, graphene oxide and fullerene as additives, assessing critically the impact of each type of filler on those properties.

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“…This is in good agreement with the contact angle outcome. Nevertheless, the methanol uptake decreases slowly by the addition of SGO due to their less affinity on methanol 28,32,37 …”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, the methanol uptake decreases slowly by the addition of SGO due to their less affinity on methanol. 28,32,37 3.3.6 | IEC, proton conductivity, methanol permeability, and membrane selectivity IEC provides the available ionizable groups present in the membrane and indicates its capability to conduct protons. As seen in Table 3, it is clearly shown that the addition of SGO is enhanced by the IEC by means of increasing the SO 3 H density in the chitosan matrix which is accountable for the high mobility of the ionizable group.…”

Section: Water Uptake Swelling Ratio and Methanol Uptakementioning

confidence: 99%

Highly selective custom‐made chitosan based membranes with reduced fuel permeability for direct methanol fuel cells

Divya

Rana

Rameesha

et al. 2021

J of Applied Polymer Sci

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Custom-made nanocomposite proton exchange membranes (PEMs) are fabricated using the blends of sulfonated chitosan (S-Chitosan) and sulfonated graphene oxide (SGO) nanosheets for direct methanol fuel cells (DMFCs). Sulfonation of chitosan and GO are carried out by 1,3-propane sultone and sulfanilic acid, respectively. Scanning electron microscope (SEM) with energy dispersive X-ray investigation revealed that the thick, folded and wrinkled sheet-like morphology of SGO and the existence of elemental sulfur. SEM and atomic force microscopy images showed the uniform dispersion of hydrophilic SGO nanosheets. Besides the S-Chitosan/SGO membranes showed higher water uptake, swelling ratio and ion exchange capacity due to the enhancement in hydrophilicity. The modified PEMs displayed improvement in proton conductivity since the ion-exchangeable sulfonic acid groups facilitate the proton conduction and effectively resist the methanol permeability by forming a strong hydrogen bond network with chitosan and thus diminish the void volume. Particularly, S-Chiotsan-1 membrane showed superior proton conductivity of 4.86 Â 10 À3 Scm À1 at (25 C), selectivity of 1.89 Â 10 5 Scm À3 s and lesser methanol permeability of 2.57 Â 10 À8 cm 2 s À1 . Overall results suggest that the S-Chitosan/ SGO membranes found to be a suitable alternate for Nafion ® in DMFCs.

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Bio-functionalized hybrid nanocomposite membranes for direct methanol fuel cells

Abstract: Featured methanol-blocking characteristics of nanocomposite membrane.

Cited by 26 publications

References 56 publications

Fabrication of PVA polymer films with improved antibacterial activity by fine-tuning via organic acids for food packaging applications

Fabrication of PVA polymer films with improved antibacterial activity by fine-tuning via organic acids for food packaging applications

Carbon Nanocomposite Membrane Electrolytes for Direct Methanol Fuel Cells—A Concise Review

Highly selective custom‐made chitosan based membranes with reduced fuel permeability for direct methanol fuel cells

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