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Surface-modified nanofiber, electrolyte membrane, method for producing electrolyte membrane, membrane electrode assembly, and solid polymer fuel cell

A nanofiber and surface modification technology, applied in the field of polymer electrolyte membranes, can solve problems such as inability to exert ionic conductivity and gas permeability inhibition

Active Publication Date: 2022-07-08
TOKYO METROPOLITAN PUBLIC UNIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When such a film thickness is made, there are problems such as that sufficient ionic conductivity (proton conductivity) cannot be exhibited, and it is difficult to suppress the gas permeability to a low level.

Method used

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  • Surface-modified nanofiber, electrolyte membrane, method for producing electrolyte membrane, membrane electrode assembly, and solid polymer fuel cell
  • Surface-modified nanofiber, electrolyte membrane, method for producing electrolyte membrane, membrane electrode assembly, and solid polymer fuel cell
  • Surface-modified nanofiber, electrolyte membrane, method for producing electrolyte membrane, membrane electrode assembly, and solid polymer fuel cell

Examples

Experimental program
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Embodiment

[0296] Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to them at all.

Synthetic example 1

[0297] "Synthesis Example 1: Synthesis of Polybenzimidazole (PBI)"

[0298] Under nitrogen atmosphere, polyphosphoric acid (PPA) was used as the polymerization solvent, 2.27 g (10.6 mmol) of 3,3'-diaminobenzidine (DAB), 2.73 g (10.6 mmol) of 4,4'-oxobisbenzoic acid (OBBA) were weighed g (10.6 mmol), polyphosphoric acid (PPA) was added so as to be a 3 mass % solution, the temperature was gradually increased while stirring, and the mixture was stirred at 140° C. for 12 hours to synthesize polybenzimidazole. The obtained polymer solution was poured into ion-exchanged water for reprecipitation, neutralized with a sodium hydroxide solution, and washed. The polybenzimidazole was recovered by suction filtration, and after natural drying for 24 hours, it was vacuum-dried at 100°C.

[0299] Using an NMR apparatus, trade name "Burker AVANCE III500" (manufactured by Bruker BioSpin), the concentration of polybenzimidazole was measured. 1 H-NMR spectrum. Depend on 1 The H-NMR spectrum ...

Embodiment 1

[0301] "Example 1: Production of PBI Nanofiber Nonwoven"

[0302] Anhydrous N,N- dimethylformamide (DMF) was added so that the polymer weight might become 8 mass %. A polymer solution was prepared by filling the vial with nitrogen and stirring overnight to dissolve. An aluminum foil was placed on the collector portion of the electrospinning device, trade name "ES-2000S" (manufactured by Fuence Corporation), a syringe filled with the polymer solution was attached to the electrospinning device, and the amount of the polymer solution released was 0.12 mL. / hour, electrospinning ( image 3 Step A shown in ). The distance between the syringe and the collector was set to 10 cm, and a voltage of 30 kV was applied to the syringe. Thus, the PBI nanofiber nonwoven fabric was laminated on the aluminum foil. Next, it was vacuum-dried at 60 degreeC for 15 hours.

[0303] A part of the nanofiber nonwoven fabric was coated with osmium and then observed with a scanning electron microscop...

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Abstract

[Subject] To develop a new type of nanofiber for constituting a composite electrolyte membrane, and to provide an electrolyte membrane having sufficient ionic conductivity (proton conductivity) and gas barrier properties even when the thickness is 30 μm or less. [Solution] Surface-modified nanofibers, an electrolyte membrane containing the nanofibers, and a method for producing a composite membrane, wherein the surface-modified nanofibers are characterized in that an acidic substance and an alkaline substance are modified on the surface of the polymer nanofibers, The acidic substance has proton conductivity, the basic substance increases the modification amount of the acidic substance, and the method for producing a composite membrane includes the steps of: forming a nonwoven fabric containing polymer nanofibers; and surface-modifying the nonwoven fabric a process of treating; a process of filling the voids of the nonwoven fabric with a matrix polymer to integrate the surface-modified nanofibers with the matrix polymer; and a process of post-treating the electrolyte membrane containing the surface-modified nanofibers.

Description

technical field [0001] The present invention relates to a surface-modified nanofiber and an electrolyte membrane in which a matrix polymer is introduced into a nanofiber nonwoven fabric, and more specifically, to a polymer electrolyte membrane useful in solid polymer fuel cells and the like. Background technique [0002] Composite membranes in which various substances are introduced into nonwoven fabrics have been used in various fields, and in recent years, they have been attracting attention as electrolyte membranes in solid polymer fuel cells. [0003] As an electrolyte membrane in a solid polymer fuel cell, a polymer electrolyte membrane has been proposed, and as an example thereof, there is a fluorine-based electrolyte represented by Nafion (registered trademark). However, these fluorine-based electrolyte membranes have the following problems: poor power generation performance due to reduced proton conductivity under low humidification conditions; membrane and catalyst ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M13/292D04H1/728D06M15/21H01B1/06H01M8/02H01M8/1016
CPCD04H1/728D06M13/292D06M15/21H01B1/06H01M8/1018H01M8/1053H01M2008/1095H01M8/1069H01M8/1086H01M8/1088H01M8/106H01M8/1062
Inventor 川上浩良田中学牧之内贵仁
Owner TOKYO METROPOLITAN PUBLIC UNIV CORP
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