Chemical and morphological properties of solution-cast perfluorosulfonate ionomers

Moore, Robert B.; Martin, Charles R.

doi:10.1021/ma00183a025

Cited by 339 publications

(327 citation statements)

References 11 publications

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“…Figure 8 shows the XRD profiles of N_RC, N_5SnO 2 , and N_5S-SnO 2 samples. In agreement with earlier reports [49][50][51], the recast Nafion membrane displayed a broad diffraction feature at 2θ = 12-22° which can be separated through deconvolution into two peaks, assigned to amorphous (2θ = 16°) and crystalline (2θ = 17.50 °) scattering from the polyfluorocarbon chains of Nafion. Crystallinity (X cr ) can be calculated from the ratio between the areas of the deconvoluted peaks.…”

Section: Conductivitysupporting

confidence: 91%

Development of Nafion/Tin Oxide Composite MEA for DMFC Applications

et al. 2010

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Wiley-VCH AbstractNafion composite membranes containing either hydrated tin oxide (SnO 2 ·nH 2 O) or sulfated tin oxide (SSnO 2 ) at 5 wt.% and 10 wt.% were prepared and characterized. The structural and electrochemical features of the samples were investigated using X-ray diffraction, electrochemical impedance spectroscopy, methanol crossover, and direct methanol fuel cell (DMFC) tests. Highest conductivity values were obtained by using S-SnO 2 as filler (0.094 Scm -1 at T=110°C and RH=100%). The presence of the inorganic compound resulted in lower methanol crossover and improved DMFC performance with respect to a reference unfilled membrane. To improve the interface of the membrane electrode assembly (MEA), a layer of the composite electrolyte (i.e., the Nafion membrane containing 5 wt% S-SnO 2 ) was brushed on the electrodes, obtaining a DMFC operating at 110°C with a power density (PD) of 100 mWcm -2 which corresponds to a PD improvement of 52% with respect to the unfilled Nafion membrane.

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Section: Conductivitysupporting

confidence: 91%

Development of Nafion/Tin Oxide Composite MEA for DMFC Applications

et al. 2010

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“…This means the membrane should have a solubility less than 5% [28]. Looking at the data in Figure 11, it can be seen that all the membrane prepared by spray method exhibit good chemical resistance as all membranes have solubility lower than 5% as Moore and Martin's suggestion [28].…”

Section: Solubilitymentioning

confidence: 87%

“…The solubility of membrane was determined by following the procedure of Moore and Martin [28]. First, 50 mg of the membrane was added to 10 ml of 50:50 methanol-water solution and sonicated in an ultrasonic bath for 1 h. The water in the ultrasonic bath was changed every 30 min to retain room temperature.…”

Section: Solubilitymentioning

confidence: 99%

Mordenite/Nafion and analcime/Nafion composite membranes prepared by spray method for improved direct methanol fuel cell performance

Prapainainar

Kongkachuichay

et al. 2017

Applied Surface Science

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Highlight Mordenite and analcime were used as fillers in Nafion composite membranes for DMFC. The composite membranes were fabricated by spray method. Methanol permeability was reduced up to 2-3 times using the composite membranes. Mordenite/Naifon membrane showed 2 times higher DMFC performance than Nafion117. AbstractThe aim of this work was to improve proton exchange membranes (PEMs) used in direct methanol fuel cells (DMFCs). A membrane with a high proton conductivity and low methanol permeability was required. Zeolite filler in Nafion (NF matrix) composite membranes were prepared using two types of zeolite, mordenite (MOR) and analcime (ANA). Spray method was used to prepare the composite membranes, and properties of the membranes were investigated: mechanical properties, solubility, water and methanol uptake, ion-exchange capacity (IEC), proton conductivity, methanol permeability, and DMFC performance. It was found that MOR filler showed higher performance than ANA. The MOR/Nafion composite membrane gave better properties than ANA/Nafion composite membrane, including a higher proton conductivity and a methanol permeability that was 2 -3 times lower. The highest DMFC performance (10.75 mW·cm -2 ) was obtained at 70 °C and with 2 M methanol, with a value 1.5 times higher than that of ANA/Nafion composite membrane and two times higher than that of commercial Nafion 117 (NF 117).

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“…An important step in the modification of Nafion membranes is the recast process, in which a film is formed after evaporating the solvent from an ionomer solution. The solution casting film is of great interest in order to repair pin holes in Nafion chlor-alkali membranes [2,7] or for coating of modified electrodes [8][9][10][11][12]. For a fundamental understanding of these processes, detailed knowledge of Nafion solutions properties and its molecular weight is a prerequisite.…”

Section: Introductionmentioning

confidence: 99%

Static light scattering and transmission microscopy study of dilute Nafion solutions

Liu¹,

Yu²,

et al. 2007

E-Polymers

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Nafion, an ionomer composed of perfluorocarbon backbone and vinyl ether side chains terminated with -SO 3 -groups, has dual solubility parameters, i.e. , ε=46.6) solutions, reported by Lousenberg, using size exclusion chromatography incorporating static light scattering detection. The data obtained from SLS measurements were compared with the particles sizes of transmission electron microscope (TEM) observations of freeze dried Nafion thin films prepared on copper grids with 0.6 mg/ml Nafion solutions. Comparable results were obtained from these two observations.

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Chemical and morphological properties of solution-cast perfluorosulfonate ionomers

Cited by 339 publications

References 11 publications

Development of Nafion/Tin Oxide Composite MEA for DMFC Applications

Development of Nafion/Tin Oxide Composite MEA for DMFC Applications

Mordenite/Nafion and analcime/Nafion composite membranes prepared by spray method for improved direct methanol fuel cell performance

Static light scattering and transmission microscopy study of dilute Nafion solutions

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