Synergistic proton transfer through nanofibrous composite membranes by suitably combining proton carriers from the nanofiber mat and pore-filling matrix

He, Yakun; Zhang, Haoqin; Li, Yifan; Wang, Jingtao; Ma, Lushan; Zhang, Wei; Liu, Jindun

doi:10.1039/c5ta03601a

Cited by 70 publications

(36 citation statements)

References 55 publications

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“…48 This could be attributed to several factors. Firstly, the irregularly shaped macro-voids in asymmetrical substrates might bear inconsistent strain; lowering strain tolerance 22 . Second, the high electric field deployed during PAN electrospinning might orientate crystalline PAN domains, 49 forming substrates with high tensile strength, modulus and toughness.…”

Section: Journal Of Materials Chemistry a Papermentioning

confidence: 99%

“…Substrates with large pores also encourage the formation of thinner selective layers that can also enhance solvent permeance; 18,19 whilst minimizing the impact of polymer densification within the substrate. 20 Polymer substrates with large pores and superior mechanical stability can be fabricated with electrospinning 21,22 -a simple approach to wet-spin polymer nanofibers from solutions using the electrostatic forces within an electrical field. 23 The interfiber pores are large (µm size), while the stacking of polymer nanofibers provide mechanical stability.…”

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confidence: 99%

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Electrospun nanofiber substrates that enhance polar solvent separation from organic compounds in thin-film composites

et al. 2018

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Section: Journal Of Materials Chemistry a Papermentioning

confidence: 99%

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confidence: 99%

Electrospun nanofiber substrates that enhance polar solvent separation from organic compounds in thin-film composites

et al. 2018

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“…problem is to add minerals to polymer membrane for improving polymers' physiochemical properties, such as elasticity, proton conductivity, methanol and water crossover, hydrophilic properties and thermal stability [35][36][37].…”

Section: June 2015mentioning

confidence: 99%

Hybrid nanocomposite membranes of sulfonated poly(ethersulfone)/1,1-carbonyl diimidazole/1-(3-aminopropyl)-silane/silica for direct methanol fuel cells

Khosravi

Hassanajili

Moslemin

et al. 2016

Korean J. Chem. Eng.

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Composite membranes of sulfonated poly(ethersulfone)/1,1-carbonyl diimidazole/1-(3-aminopropyl)-silane/silica (SPES/CDI/AS/SiO 2 ) with silica of various contents (3, 5 and 8 wt%) were prepared as electrolytes for direct methanol fuel cells (DMFCs). Comparison was made with pure SPES and SPES/SiO 2 . The properties of the composite membranes were studied by FTIR, TGA, XRD, water and methanol uptake, proton conductivity. SPES/CDI/AS/SiO 2 membranes were also characterized by scanning electron microscopy (SEM), which showed good adhesion between the modified sulfonic acid (-SO 3 H) groups of SPES and silica because of cross-linking with covalent bond formation and reduced cavities in the composites. This effect played an important role in reducing water uptake, methanol uptake and methanol permeability of the SPES/CDI/AS/SiO 2 composites. The water and methanol uptake and also methanol permeability of the SPES/CDI/AS/SiO 2 composite membrane with 8% SiO 2 were found in the order 3.58%, 2.48% and 1.91×10 −7 (cm 2 s −1 ), lower than those of SPES and Nafion 117. In SPES membrane of 16.94% level of sulfonation, the proton conductivity was 0.0135 s/cm at 25 o C, which approached that of Nafion 117 under the same conditions. Also, the proton conductivity of the SPES/CDI/AS/SiO 2 8% membrane was 0.0186 s/cm, which was higher than that of SPES at room temperature. The preparation of SPES/SiO 2 composites in the presence of AS and CDI, led to 63%, 56% and 64% reduction of water uptake, methanol uptake and methanol permeability, respectively without a sharp drop in proton conductivity of the composite membranes which featured a good balance between high proton conductivity, water and methanol uptake of SPES/CDI/AS/SiO 2 membranes.

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“…In the applications of NFCPEMs, nanofibers have been widely investigated as either mechanical or stability reinforcing component or proton conductor . The morphology of nanofibrous membranes had important effects on NFCPEMs performance.…”

Section: Introductionmentioning

confidence: 99%

Modeling and optimization of sulfonated poly (ether ether ketone) nanofibrous proton exchange membranes with response surface methodology

Sadrjahani

Gharehaghaji

Javanbakht

2017

Polymer Engineering & Sci

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The morphological control of proton conductive nanofibrous mat used in proton exchange membranes (PEMs) is a key issue to improve proton conductivity of PEMs. In this study, response surface methodology (RSM) was utilized to investigate the morphological characterizations of electrospun sulfonated poly(ether ether ketone) (SPEEK) nanofibrous membranes. The effects of electrospinning parameters namely solution concentration, applied voltage and tip to collector distance were studied on the average diameter, its standard deviation and the degree of alignment of SPEEK nanofibers. The adequacy of the response surface models was verified by the validation experiments. Optimized conditions were obtained to meet the desired status of collecting more uniform and finer nanofibers with improved alignment. After obtaining the significant factors and optimal test level, an additional optimization was conducted at different take-up speeds to fabricate high-grade aligned nanofibers. The resultant nanofibers had the diameter of 107 6 22 nm at the optimum point which was in good agreement with the predicted response values. The highest degree of alignment was yielded at the take-up speed of 8.8 m/s with the maximum second-order orientation parameter of 0.869. Electrochemical spectroscopy analysis showed that the aligning of proton conductive nanofibers improved inplane proton conductivity about 67%. POLYM. ENG. SCI., 58:619-631,

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Synergistic proton transfer through nanofibrous composite membranes by suitably combining proton carriers from the nanofiber mat and pore-filling matrix

Abstract: A series of nanofibrous composite membranes are designed to explore the synergistic proton conduction among different carrier sites.

Cited by 70 publications

References 55 publications

Electrospun nanofiber substrates that enhance polar solvent separation from organic compounds in thin-film composites

Electrospun nanofiber substrates that enhance polar solvent separation from organic compounds in thin-film composites

Hybrid nanocomposite membranes of sulfonated poly(ethersulfone)/1,1-carbonyl diimidazole/1-(3-aminopropyl)-silane/silica for direct methanol fuel cells

Modeling and optimization of sulfonated poly (ether ether ketone) nanofibrous proton exchange membranes with response surface methodology

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