High proton conductivity and low fuel crossover of polyvinylidene fluoride–hexafluoro propylene–silica sulfuric acid composite membranes for direct methanol fuel cells

kumar, G. Gnana; Kim, Ae Rhan; Nahm, Kee Suk; Yoo, Dong Jin

doi:10.1016/j.cap.2010.12.015

Cited by 25 publications

(2 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The FTIR spectra of pure PVdF-co-HFP, NH 4 SCN and PVdF-co-HFP: NH 4 SCN complexes of various compositions are shown in Figure2 and vibrational peaks are given in Table 1.The observed peaks at 1390,1173, 502 ,416 cm -1 are ascribed to -CF 2 ( wagging, symmetric stretching, bending and deformation) of pure PVdF-co-HFP respectively [22] . The peak at 3110 cm -1 is ascribed to γ N-H stretching of pure NH 4 SCN.…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 96%

Novel Proton-Conducting Polymer Electrolytes Based on Poly(Vinylidene fluoride-co-hexafluoropropylene)–Ammonium Thiocyanate

Selvakumar

Kalaiselvimary

Rajendran

et al. 2016

Polymer-Plastics Technology and Engineering

View full text Add to dashboard Cite

The polymer electrolytes composed of Poly (vinylidene fluoride-co-hexa fluoro propylene) with various concentration of ammonium thiocyanate salt have been prepared by solution casting technique. The complex formation between polymer and dissociated salt has been confirmed by X-ray diffraction analysis and Fourier transforms infrared spectroscopy. The highest conductivity has been found to be 6.5×10 -3 Scm -1 at 343 K for 25wt% NH 4 SCN. The temperature dependent conductivity of polymer electrolyte follows Arrhenius hopping relation. Thermo gravimetric analysis has been used to ascertain the thermal stability of the polymer electrolytes. AFM analysis predicts the roughness parameter of the sample with higher conductivity. GRAPHICAL ABSTRACTDownloaded by [University of Sussex Library] at 22:

show abstract

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 96%

Novel Proton-Conducting Polymer Electrolytes Based on Poly(Vinylidene fluoride-co-hexafluoropropylene)–Ammonium Thiocyanate

Selvakumar

Kalaiselvimary

Rajendran

et al. 2016

Polymer-Plastics Technology and Engineering

View full text Add to dashboard Cite

show abstract

“…Poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP), a semicrystalline polymer, is a material which has attracted extensive attention due to its high chemical and thermal stabilities. − The PVDF-HFP could be physically cross-linked by the crystallization of the VDF segments, and it was widely utilized as the network material for tough ion gel preparation. ,− It was reported that PVDF-HFP single-network (SN) ion gels had excellent mechanical strength. , For example, a tough ion gel composed of 80 wt % of an IL and 20 wt % of the PVDF-HFP network fabricated by Jansen et al showed high Young’s modulus of 3 MPa and high break strength of 2 MPa . However, PVDF-HFP SN ion gels had poor IL holding properties because of their spongelike network structure, leading to IL leakage from the ion gel membrane.…”

Section: Introductionmentioning

confidence: 99%

Novel Tough Ion-Gel-Based CO₂ Separation Membrane with Interpenetrating Polymer Network Composed of Semicrystalline and Cross-Linkable Polymers

Zhang

Kamio

Matsuoka

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

A tough ion gel constructed from an interpenetrating polymer network (IPN) and high ionic liquid (IL) content was developed using a one-pot/one-step method. The IPN structure was composed of the physically cross-linked poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) network and the chemically cross-linked poly(N,N-dimethylacrylamide-co-N-succinimidyl acrylate) (poly(DMAAm-co-NSA)) network, which, respectively, contributed to the high mechanical strength and good IL holding property of the IPN ion gel. The IPN ion gel containing 80 wt % of IL, 10 wt % of PVDF-HFP network, and 10 wt % of poly(DMAAm-co-NSA) network prepared at 50 °C displayed high tensile fracture energy (758 kJ/m 3 ) and a good IL holding property under compression at 1.16 MPa (weight loss of the ion gel: 0.79 wt %). An IPN ion gel membrane with a high IL content of 91.3 wt % was successfully fabricated and showed a high CO 2 permeability of 1421 barrer and CO 2 /N 2 permselectivity of 27.

show abstract

Vinyl‐addition type norbornene copolymer containing sulfonated biphenyl pendant groups for proton exchange membranes

Chen

Liu

et al. 2012

J of Applied Polymer Sci

View full text Add to dashboard Cite

The vinyl addition type copolymer poly(butoxymethylene norbornene-co-biphenyl oxyhexamethyleneoxymethylene norbornene) (P(BN/BphN)) was synthesized by using bis-(b-ketonaphthylimino)nickel(II)/B(C 6 F 5 ) 3 catalytic system. P(BN/BphN) was sulfonated to give sulfonated P(BN/BphN) (SP(BN/BphN)) with concentrated sulfuric acid (98%) as sulfonating agent in a component solvent. The ion exchange capacity (IEC), degree of sulfonation (DS), water uptake, and methanol permeability of the SP(BN/BphN)s were increased with the sulfonated time. The methanol permeability of the SP(BN/BphN) membranes was in the range of 1.8 Â 10 À7 to 7.5 Â 10 À7 cm 2 /s, which were lower than the value 1.3 Â 10 À6 cm 2 /s of Nafion V R 115. The proton conductivity of SP(BN/BphN) membranes increased with the increase of IEC values, temperature, and water uptake. Water uptake of the SP(BN/BphN) membranes was lower than that of Nafion V R 115 and leads to low proton conduction. Microscopic phase separation occurred in SP(BN/BphN) membrane and domains containing sulfonic acid groups were investigated by SEM and TEM. SP(BN/BphN) membranes had good mechanical properties, high thermal stability, and excellent oxidative stability.

show abstract

High proton conductivity and low fuel crossover of polyvinylidene fluoride–hexafluoro propylene–silica sulfuric acid composite membranes for direct methanol fuel cells

Cited by 25 publications

References 25 publications

Novel Proton-Conducting Polymer Electrolytes Based on Poly(Vinylidene fluoride-co-hexafluoropropylene)–Ammonium Thiocyanate

Novel Proton-Conducting Polymer Electrolytes Based on Poly(Vinylidene fluoride-co-hexafluoropropylene)–Ammonium Thiocyanate

Novel Tough Ion-Gel-Based CO₂ Separation Membrane with Interpenetrating Polymer Network Composed of Semicrystalline and Cross-Linkable Polymers

Vinyl‐addition type norbornene copolymer containing sulfonated biphenyl pendant groups for proton exchange membranes

Contact Info

Product

Resources

About

High proton conductivity and low fuel crossover of polyvinylidene fluoride–hexafluoro propylene–silica sulfuric acid composite membranes for direct methanol fuel cells

Cited by 25 publications

References 25 publications

Novel Proton-Conducting Polymer Electrolytes Based on Poly(Vinylidene fluoride-co-hexafluoropropylene)–Ammonium Thiocyanate

Novel Proton-Conducting Polymer Electrolytes Based on Poly(Vinylidene fluoride-co-hexafluoropropylene)–Ammonium Thiocyanate

Novel Tough Ion-Gel-Based CO2 Separation Membrane with Interpenetrating Polymer Network Composed of Semicrystalline and Cross-Linkable Polymers

Vinyl‐addition type norbornene copolymer containing sulfonated biphenyl pendant groups for proton exchange membranes

Contact Info

Product

Resources

About

Novel Tough Ion-Gel-Based CO₂ Separation Membrane with Interpenetrating Polymer Network Composed of Semicrystalline and Cross-Linkable Polymers