Proton-conducting blend membranes of Nafion/poly(vinylphosphonic acid) for proton exchange membrane fuel cells

Şen, Ünal; Acar, Oktay; Çelik, Sevim Ünügür; Bozkurt, Ayhan; Ata, Ali; Tokumasu, Takashi; Miyamoto, Akira

doi:10.1007/s10965-013-0217-2

Cited by 23 publications

(19 citation statements)

References 32 publications

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“…On the other hand, Nafion-PVPA blend membranes are not stable with high PVPA content. In our experimental work, maximum proton conductivity was obtained with 1:3 composition [16]. In that composition, it was clear that the PVPA phase was continuous enough to promote proton conductivity through interaction with sulfonic acid groups of Nafion.…”

Section: Morphologymentioning

confidence: 62%

“…Several authors have studied novel polyelectrolyte systems with high conductivity at temperatures from 100 • C to 200 • C as an alternative solution to the commercial perfluorinated polyelectrolytes (e.g., Nafion), which show high conductivities only through water-assisted proton conduction [10][11][12] and operate at temperatures below 100 • C [13]. To date, building strong acid-base complexes among functionalities connected to the polymeric backbones has been one of the most well-known methods that enable high proton conductivity under low humidity or even anhydrous conditions [14][15][16][17][18][19][20]. In these materials, a homogeneous polymeric blend is formed by strong multiple acid-base interactions and hydrogen bonding networks, allowing proton conductivity by Bronsted acid-base pairs.…”

Section: Introductionmentioning

confidence: 99%

“…The present study is complementary to our previous experimental studies on proton-conducting PFSA-based polymer blends. In these studies, Nafion/poly(vinyl phosphonic acid) (Nafion-PVPA) [16] and Nafion/poly(1-vinyl-1,2,4triazole) (Nafion-PVTri) [29] blend membranes with significant anhydrous proton conductivity were fabricated. However, it is not possible to experimentally analyze the mesoscale morphologies of these blends.…”

Section: Introductionmentioning

confidence: 99%

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Mesoscale Morphologies of Nafion-Based Blend Membranes by Dissipative Particle Dynamics

et al. 2021

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Polymer electrolyte membrane (PEM) composed of polymer or polymer blend is a vital element in PEM fuel cell that allows proton transport and serves as a barrier between fuel and oxygen. Understanding the microscopic phase behavior in polymer blends is very crucial to design alternative cost-effective proton-conducting materials. In this study, the mesoscale morphologies of Nafion/poly(1-vinyl-1,2,4-triazole) (Nafion-PVTri) and Nafion/poly(vinyl phosphonic acid) (Nafion-PVPA) blend membranes were studied by dissipative particle dynamics (DPD) simulation technique. Simulation results indicate that both blend membranes can form a phase-separated microstructure due to the different hydrophobic and hydrophilic character of different polymer chains and different segments in the same polymer chain. There is a strong, attractive interaction between the phosphonic acid and sulfonic acid groups and a very strong repulsive interaction between the fluorinated and phosphonic acid groups in the Nafion-PVPA blend membrane. By increasing the PVPA content in the blend membrane, the PVPA clusters’ size gradually increases and forms a continuous phase. On the other hand, repulsive interaction between fluorinated and triazole units in the Nafion-PVTri blend is not very strong compared to the Nafion-PVPA blend, which results in different phase behavior in Nafion-PVTri blend membrane. This relatively lower repulsive interaction causes Nafion-PVTri blend membrane to have non-continuous phases regardless of the composition.

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Section: Morphologymentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mesoscale Morphologies of Nafion-Based Blend Membranes by Dissipative Particle Dynamics

et al. 2021

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“…Although pure PVPA has several advantages, its water solubility makes it an improper material for PEMFC applications. Previously, Sen et al reported the preparation of PVPA blended Nafion, Nafion-P(VPA) 3 , with a maximum proton conductivity of 1.1×10 −5 S/cm at 130°C and anhydrous conditions [71]. In another work reported by Aslan et al a maximum proton conductivity of 5×10 −5 S/cm at 150°C was found for PVPA-grafted poly(glycidylmethacrylate), P(GMA)-g-P(VPA) 10 [41].…”

Section: Proton Conductivity Measurementsmentioning

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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“…To date, one of the most successful approaches to achieve high proton conductivity at low humidity or completely anhydrous conditions in PEMFCs relies on the construction of strong acid‐based complexes between functionalities attached to the polymeric backbones . In these structures, a homogeneous polymeric matrix forms via strong multipoint acid–base interactions and hydrogen bonding networks, and proton conductivity occurs through Bronsted acid–base pairs.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Anhydrous Proton Conductivity of Poly(vinylphosphonic acid)–Poly(2,5‐benzimidazole) Membranes via In Situ Polymerization

Şen

Usta

Acar

et al. 2014

Macro Chemistry & Physics

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Polymer electrolyte membranes (PEMs) are synthesized via in situ polymerization of vinylphosphonic acid (VPA) within a poly(2,5‐benzimidazole) (ABPBI) matrix. The characterization of the membranes is carried out by using Fourier transform infrared (FTIR) spectroscopy for the interpolymer interactions, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) for the thermal properties, and scanning electron microscopy (SEM) for the morphological properties. The physicochemical characterizations suggest the complexation between ABPBI and PVPA and the formation of homogeneous polymer blends. Proton conductivities in the anhydrous state (150 °C) measured by using impedance spectroscopy are considerable, at up to 0.001 and 0.002 S cm−1 for (1:1) and (1:2) molar ratios, respectively. These conductivities indicate significant improvements (>1000×) over the physically blended samples. The results shown here demonstrate the great potential of in situ preparation for the realization of new PEM materials in future high‐temperature and non‐humidified polymer electrolyte membrane fuel cell (PEMFC) applications.

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Proton-conducting blend membranes of Nafion/poly(vinylphosphonic acid) for proton exchange membrane fuel cells

Cited by 23 publications

References 32 publications

Mesoscale Morphologies of Nafion-Based Blend Membranes by Dissipative Particle Dynamics

Mesoscale Morphologies of Nafion-Based Blend Membranes by Dissipative Particle Dynamics

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

Enhancement of Anhydrous Proton Conductivity of Poly(vinylphosphonic acid)–Poly(2,5‐benzimidazole) Membranes via In Situ Polymerization

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