Pore size tuning of Nafion membranes by UV irradiation for enhanced proton conductivity for fuel cell applications

Rao, Arjun Sunil; Rashmi, K.R.; Manjunatha, D.V.; Jayarama, A.; Prabhu, S. S.; Pinto, R.

doi:10.1016/j.ijhydene.2019.07.084

Cited by 38 publications

(25 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The exploded view of the passive μ‐DMFC embedding UV irradiated Nafion as membrane 91 [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Measurement On Membrane Propertiesmentioning

confidence: 99%

“…Water uptake value can be calculated as given formula,

italicWater uptake (() %) = \frac{W_{wet} - W_{dry}}{W_{italicdry}} \times 100

where W wet is the wet weight of the membrane samples after immersed in deionized water for 24 hours and W dry is the dry weight of the membrane samples 84,97 . Rao et al 91 enhanced the commercial Nafion membrane performances by exposing it to UV radiation. The study obtained a water uptake value of 23.56 ± 0.8% for the UV irradiated Nafion 212 membrane at a UV dose of 198 mJ/cm 2, which this value increased as the swelling ratio also increased.…”

Section: Measurement On Membrane Propertiesmentioning

confidence: 99%

“…The swelling ratio is beneficial for PEMs, especially for depicting anisotropic swelling, in which the membrane swells differently in a different directions 103,104 and difficult to be accounted at low relative humidity. It is commonly measured after being equilibrated in water using given equation formula,

italicSwelling ratio (() %) = \frac{t_{wet} - t_{dry}}{t_{italicdry}} \times 100

where t wet and t dry are the thickness of the membrane after immersing in the deionized water for 24 hours and the thickness of the membrane at dry condition 84,91 . Wang et al 92 had conducted a study regarding modification made onto the Nafion 212 commercial membrane.…”

Section: Measurement On Membrane Propertiesmentioning

confidence: 99%

“…Rao et al 91 enhanced the commercial Nafion membrane performances by exposing it to UV radiation. The study was conducted for passive μ‐DMFC system, and the results obtained were stunning with a high swelling ratio reached up to 19.24 ± 0.6% at a UV dose of 198 mJ/cm 2 .…”

Section: Measurement On Membrane Propertiesmentioning

confidence: 99%

See 3 more Smart Citations

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

2020

View full text Add to dashboard Cite

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.

show abstract

“…The exploded view of the passive μ‐DMFC embedding UV irradiated Nafion as membrane 91 [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Measurement On Membrane Propertiesmentioning

confidence: 99%

“…Water uptake value can be calculated as given formula,

italicWater uptake (() %) = \frac{W_{wet} - W_{dry}}{W_{italicdry}} \times 100

Section: Measurement On Membrane Propertiesmentioning

confidence: 99%

italicSwelling ratio (() %) = \frac{t_{wet} - t_{dry}}{t_{italicdry}} \times 100

Section: Measurement On Membrane Propertiesmentioning

confidence: 99%

Section: Measurement On Membrane Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

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

2020

View full text Add to dashboard Cite

show abstract

“…Later, the weighed membranes be soaked in deionised water for 24 hours in ambient condition and bottled dry with absorbent paper to remove excess moisture on the surface, and then be reweighted. 9 The following equation was adhered to calculate the value of water uptake.…”

Section: Water Uptake Measurementmentioning

confidence: 99%

Porous polyether sulfone for direct methanol fuel cell applications: Structural analysis

et al. 2020

View full text Add to dashboard Cite

Summary Porous poly ether sulfone (PES) membranes were prepared using two different solvents which were N‐methyl‐2‐pyrrolidone and dimethylacetamide (DMAc) via dry/wet non‐solvent phase inversion (NIPS) techniques. PES with the compositions of 18 wt% is prepared for each dope solution. During the membrane casting process, 0 to 5 minutes delay prior to immersion in coagulant bath is set in order to allow solvent evaporation to take place. Water is used as the non‐solvent for solvent exchange process. The prepared membranes are characterised based on their morphological aspect using scanning electron microscopy towards the effect of solvent evaporation time and solution viscosity. The changes in proton conductivity, methanol permeability, water uptake and hydrophilicity/hydrophobicity behaviours are also studied. Conclusively, the 18 wt% PES membranes prepared with DMAc as solvent at 3 minutes solvent evaporation time exhibited desirable pore size for proton conduction (0.04 × 10−3 Scm−1) and methanol resistant effect that consequently contribute to considerably low methanol permeability rate at 0.06 × 10−7 cm2 s−1 which could elevate the direct methanol fuel cell performance.

show abstract

Introduction of a crystalline block as a strategy to increase swelling resistance and dimensional stability of sulfonated copolyimide

Sapegin

Gubanova

Vlasova

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

The introduction of blocks inclined to form areas of high crystallinity into the sulfonated block co-polyimide is investigated as a prospective strategy to increase swelling resistance and dimensional stability of the polymer in application to the proton exchange membranes development. The novel copolymer with the highly crystalline block was obtained and characterized by the means of static and dynamic light scattering, IR spectroscopy, thermal gravimetric analysis and differential scanning calorimetry. The structural and morphological features of the obtained copolymer were investigated with X-ray diffraction analysis and atomic force microscopy. Transport properties of the co-polyimide are evaluated in terms of pervaporation, proton conductivity measurements and dielectric spectroscopy experiments. The article aims at the evaluation of the influence of the high-crystalline block introduction on morphological, transport and physical properties of the sulfonated copolymer. The properties of the obtained crystalline sulfonated copolymer are compared to the ones of the similar amorphous polyimide. The studied crystalline copolymer showed constancy of the proton conductivity values in the broad range of temperatures (20-120 C, RMSD of 0.23%) and relative humidity values.

show abstract

Pore size tuning of Nafion membranes by UV irradiation for enhanced proton conductivity for fuel cell applications

Cited by 38 publications

References 74 publications

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

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

Porous polyether sulfone for direct methanol fuel cell applications: Structural analysis

Introduction of a crystalline block as a strategy to increase swelling resistance and dimensional stability of sulfonated copolyimide

Contact Info

Product

Resources

About