Ionic crosslinking of ionomer polymer electrolyte membranes using barium cations

Gasa, Jeffrey; Weiss, R.A.; Shaw, Montgomery T.

doi:10.1016/j.memsci.2007.07.031

Cited by 63 publications

(42 citation statements)

References 24 publications

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“…The addition of cerium ions seems induce ionic crosslinking between sulfonic acid groups, and this effect might decrease water uptake. Similar results have been reported by other groups in the case of multivalent ions such as barium [22,23]. However, the decrease in water uptake was not severe because the amounts of cerium ion were controlled to minimize the decrease.…”

Section: Characterization Of Composite Membranessupporting

confidence: 90%

“…As expected from the water uptake and IEC results, a part of sulfonic acid was exchanged with cerium ions. Cerium ions decrease proton transport in the SPES50 membranes, and the s in the composite membranes strongly depends on the concentration of cerium ions [22]. SPES50-Ce 4e8 showed much lower s than SPES50-Ce 1e2 .…”

Section: Characterization Of Composite Membranesmentioning

confidence: 93%

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Hydrocarbon-based polymer electrolyte cerium composite membranes for improved proton exchange membrane fuel cell durability

Lee

Han

Choi

et al. 2015

Journal of Power Sources

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Section: Characterization Of Composite Membranessupporting

confidence: 90%

Section: Characterization Of Composite Membranesmentioning

confidence: 93%

Hydrocarbon-based polymer electrolyte cerium composite membranes for improved proton exchange membrane fuel cell durability

Lee

Han

Choi

et al. 2015

Journal of Power Sources

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“…Fuel crossover at high methanol concentrations from anode side to the cathode side causes polarization losses. In this study, methanol permeability of the composite membranes was measured by simple homemade test cell similar to the study of Gasa et al [24]. The cell is filled with 2 ml methanol and the mass flow is recorded as a function of time ( Figure 6).…”

Section: Methanol Permeabilitymentioning

confidence: 99%

Synthesis and characterization of poly(vinyl alcohol) proton exchange membranes modified with 4,4-diaminodiphenylether-2,2-disulfonic acid

Boroğlu¹,

Çavuş²,

Boza³

et al. 2011

Express Polym. Lett.

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Abstract.A proton-exchange membrane for a direct methanol fuel cell was prepared by modifying the chemical structure of poly(vinyl alcohol) (PVA) by means of sulfonation. We report the synthesis of a new proton-conducting polymer membrane with poly (vinyl alcohol) and diamine-containing organic molecules immobilized to PVA. The sulfonation was carried out by using 4,4-diaminodiphenyl ether-2,2-disulfonic acid (ODADS). A sulfonated diamine monomer, ODADS, was successfully synthesized by direct sulfonation of a commercially available diamine, 4,4-diaminodiphenyl ether (ODA), using fuming sulfuric acid as the sulfonating reagent. The chemical structure and thermal stability of the sulfonated PVA were studied by using FTIR and thermogravimetric analysis techniques, respectively. The proton conductivities of membranes were investigated as a function of ODADS content. The thermal decomposition of PVA-ODADS membranes started at 220°C. Differential scanning calorimetry (DSC) results indicated the homogeneity of the blends. Proton conductivity values of the sulfonated PVA membranes ranged between 8.25 and 16.53 mS/cm and the conductivities of PVA-ODADS membranes increased with the increasing ODADS content.

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“…The membranes with low methanol diffusion coefficient are required because methanol diffuses from the anode side to the cathode side leads to lower cell voltage and decreases fuel efficieny due to polarization losses. In this study, methanol permeability of the composite membranes was measured by simple homemade diaphragm diffusion cell similar to the study of Gasa et al [58]. The cell was filled with 2 mL methanol and the mass flow was recorded as a function of time (Fig.…”

Section: Methanol Permeabilitymentioning

confidence: 99%

Investigation of perfluorinated proton exchange membranes prepared via a facile strategy of chemically combining poly(vinylphosphonic acid) with PVDF by means of poly(glycidyl methacrylate) grafts

2015

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A versatile and diverse grafting method was employed in the preparation of perfluorinated PEMs, in which poly(vinyl phosphonic acid) (PVPA) and poly(vinylidene fluoride) (PVDF) were chemically combined by means of poly(glycidyl methacrylate) (PGMA) grafts. Alkaline treated PVDF was used as a macromolecule in conjunction with GMA in the graft copolymerization. Various PVDF-g-PGMA-g-PVPA membranes were obtained upon simply mixing PVDF-g-PGMA and PVPA at several ratios by mass. The composition and the structure of the membranes were characterized by Energy Dispersive X-ray spectroscopy (EDS), 1 H-NMR, 19 F-NMR, and FTIR. Thermogravimetric analysis (TGA) demonstrated that the PVDF-g-PGMA and PVDF-g-PGMA-g-PVPA membranes were thermally stable up to 275 and 210°C, respectively. The surface roughness and morphology of the membranes were studied using Atomic Force Microscopy (AFM), X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The proton conductivity increased with increasing temperature and PVPA ratio in the absence of humidity. The maximum proton conductivity in anhydrous conditions at 150°C was 0.0023 Scm −1 while in humidified conditions (under 50 % of RH) at 100°C a value of 0.034 Scm −1 was found.

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Ionic crosslinking of ionomer polymer electrolyte membranes using barium cations

Cited by 63 publications

References 24 publications

Hydrocarbon-based polymer electrolyte cerium composite membranes for improved proton exchange membrane fuel cell durability

Hydrocarbon-based polymer electrolyte cerium composite membranes for improved proton exchange membrane fuel cell durability

Synthesis and characterization of poly(vinyl alcohol) proton exchange membranes modified with 4,4-diaminodiphenylether-2,2-disulfonic acid

Investigation of perfluorinated proton exchange membranes prepared via a facile strategy of chemically combining poly(vinylphosphonic acid) with PVDF by means of poly(glycidyl methacrylate) grafts

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