SiO2-coated polyimide nonwoven/Nafion composite membranes for proton exchange membrane fuel cells

Lee, Jung Ran; Kim, Na Young; Lee, Moo Seok; Lee, Sang Young

doi:10.1016/j.memsci.2010.11.004

Cited by 56 publications

(22 citation statements)

References 30 publications

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“…This value could be further reduced to around 0.01 S/cm with IEC value reduced from 0.58 to 0.33 meq/g, compared with the IEC value of 0.91 meq/g for Nafion 117 [73][74][75][76]. Similar phenomenon was evident with the use of Nafion/PVDF [77], Nafion/SiO 2 -coated polyetherimide composite membranes [39], etc., as the proton exchange membranes. In addition, with the filling of longrange one-dimensional nanofibrous materials, a series of other properties of the membranes were significantly improved, such as the mechanical properties [73][74][75][76], hydrolytic stability [79], reduced methanol crossover [73][74][75][76], and so forth.…”

Section: Electrospun Electrolyte Membranessupporting

confidence: 59%

“…The dispersion and size distribution of catalyst nanoparticles are optimized for maximum exploitation and rapid kinetics, which provide a way to decrease the metal loading. Table 2.2 summarizes electrospun nanofibers from carbon and other materials such as TiO 2 [24,33] and conducting polymers [38,39] as the supports for electrode catalysts in different fuel cells.…”

Section: Electrospun Nanofiber-supported Catalystsmentioning

confidence: 99%

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Electrospun Nanofibers for Design and Fabrication of Electrocatalysts and Electrolyte Membranes for Fuel cells

Lin¹,

Yao²,

Zhang³

2014

Nanostructure Science and Technology

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In the past decades, in response to the energy needs of modern society and emerging ecological concerns, the pursuit of novel, low-cost, and environmentally friendly energy conversion and storage systems has raised significant interest. Among these systems, fuel cells have gained much attention for their high efficiency and high power density, with low greenhouse gas emission. As one of the most promising and versatile fabrication methods for one-dimensional mesostructured nanomaterials composed of organic, inorganic, metallic, or hybrid components prepared as randomly or orientedly arranged continuous nanofibrous mats with possibilities of ordered internal morphologies such as core-sheath, hollow, or porous fibers, or even multichanneled microtubes, electrospinning has been widely investigated to fabricate electrocatalysts and electrolyte materials applied in fuel cells because of their dimensional, directional, and compositional flexibility. In this chapter, the application of electrospun nanofibers for the specific design and fabrication of different components is reviewed in detail. Particular progresses with the use of electrospun nanofibers on improved fuel cell performance, such as power density, ionic conductivity, interfacial resistance, and chemical stability, as well as mechanical strength are emphasized, which, as we hope, can trigger further development and evolution of fuel cells as one potential energy conversion device and system. Zhan Lin and Yingfang Yao contributed equally to this chapter.

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Section: Electrospun Electrolyte Membranessupporting

confidence: 59%

Section: Electrospun Nanofiber-supported Catalystsmentioning

confidence: 99%

Electrospun Nanofibers for Design and Fabrication of Electrocatalysts and Electrolyte Membranes for Fuel cells

Lin¹,

Yao²,

Zhang³

2014

Nanostructure Science and Technology

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“…The reinforcement could be achieved by the development of porous substrate-reinforced composite membranes. It could be done only by filling high-conductivity ionomers into porous substrates or by forming a three-layered structure (ionomer/ionomer filled substrate/ionomer) [12][13][14][15][16][17][18][19][20]. Perfluorosuflonic acid (PFSA) ionomers are still the most frequently used material even though less expensive hydrocarbon membranes have been intensively developed [7,[21][22][23] Among many reasons for the use of PFSA ionomers, the main one would be the good stability against mechanical and chemical stress occurring during fuel cell or water electrolysis operation.…”

Section: Introductionmentioning

confidence: 99%

Composite Membranes Using Hydrophilized Porous Substrates for Hydrogen Based Energy Conversion

Lim¹,

Park²

2020

Energies

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Poly(tetrafluoroethylene) (PTFE) porous substrate-reinforced composite membranes for energy conversion technologies are prepared and characterized. In particular, we develop a new hydrophilic treatment method by in-situ biomimetic silicification for PTFE substrates having high porosity (60–80%) since it is difficult to impregnate ionomer into strongly hydrophobic PTFE porous substrates for the preparation of composite membranes. The thinner substrate having ~5 μm treated by the gallic acid/(3-trimethoxysilylpropyl)diethylenetriamine solution with the incubation time of 30 min shows the best hydrophilic treatment result in terms of contact angle. In addition, the composite membranes using the porous substrates show the highest proton conductivity and the lowest water uptake and swelling ratio. Membrane-electrode assemblies (MEAs) using the composite membranes (thinner and lower proton conductivity) and Nafion 212 (thicker and higher proton conductivity), which have similar areal resistance, are compared in I–V polarization curves. The I–V polarization curves of two MEAs in activation and Ohmic region are very identical. However, higher mass transport limitation is observed for Nafion 212 since the composite membrane with less thickness than Nafion 212 would result in higher back diffusion of water and mitigate cathode flooding.

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“…If the molecular weight of the PI becomes too low, the functionalized PI becomes quite brittle with reduced strength and stiffness. 11 The surface treatment of the fiber is another way to increase the interfacial adhesion except the functionalization of resin. Several techniques of surface treatments on fibers have been used to improve the interfacial strength such as wet oxidation, sizing, whiskerization, thermal treatments, and coupling agent (CA) treatments.…”

Section: Introductionmentioning

confidence: 99%

The effect of coupling agents on the mechanical properties of carbon fiber-reinforced polyimide composites

Nie

2014

Journal of Thermoplastic Composite Materials

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Carbon fiber (CF)-reinforced polyimide (PI) has been widely used in many engineering fields because of its high specific strength and stiffness. However, PI does not adhere well with CFs because it has low free surface energy. In addition, high viscosity in the melted phase causes poor impregnation. In this study, surface treatment methods, that is, coupling agents (CAs) with plasma treatment on CFs, were applied to increase the interfacial strength between the CFs and the PI matrix. The modified CF surfaces were analyzed by X-ray photoelectron spectroscopy and scanning electron microscopy. To analyze the effectiveness of the surface treatment method, the interlaminar shear strength (ILSS) was measured using the three-point bending test. From the test results, the ILSS of the specimens treated with the silane CA after the plasma treatment increased by 48.7% compared with the untreated specimens.

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SiO2-coated polyimide nonwoven/Nafion composite membranes for proton exchange membrane fuel cells

Cited by 56 publications

References 30 publications

Electrospun Nanofibers for Design and Fabrication of Electrocatalysts and Electrolyte Membranes for Fuel cells

Electrospun Nanofibers for Design and Fabrication of Electrocatalysts and Electrolyte Membranes for Fuel cells

Composite Membranes Using Hydrophilized Porous Substrates for Hydrogen Based Energy Conversion

The effect of coupling agents on the mechanical properties of carbon fiber-reinforced polyimide composites

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