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Composite proton exchange membrane and preparation method thereof

A proton exchange membrane, mixed liquid technology, applied in fuel cells, electrochemical generators, electrical components, etc., can solve the problems of high methanol permeability, low proton conductivity, difficult preparation costs, etc. Simple, reduce the effect of descending

Active Publication Date: 2018-01-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Perfluorosulfonic acid-type proton exchange membrane has the advantages of high mechanical strength, good chemical stability, and high proton conductivity when the water content is high, and is widely used in proton exchange membrane fuel cells, proton exchange membrane electrolysis of water and ion membrane electrolyzer for caustic soda production , but the perfluorosulfonic acid proton exchange membrane also has obvious disadvantages: the price is too expensive, the proton conductivity is very low in the case of low water content, and the methanol permeability in methanol fuel cells is too high, the above problems are the main obstacles to the wide-scale application of perfluorosulfonic acid membranes
However, since the proton membrane has not given up the use of perfluorinated Nafion membrane as a substrate, its preparation cost is still unacceptable

Method used

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  • Composite proton exchange membrane and preparation method thereof
  • Composite proton exchange membrane and preparation method thereof
  • Composite proton exchange membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Sulfonation: Add 90mL deionized water and 10g polyvinyl alcohol (PVA) into a 500mL three-neck flask, stir at 60°C for 2h, raise the temperature to 90°C and continue stirring until the PVA is completely dissolved. Afterwards, the PVA solution was placed in an ice bath to cool down, and when the temperature was cooled to 0°C, 2 mL of concentrated sulfuric acid was added dropwise to the system, and mechanically stirred for about 2 h under ice bath conditions. Then add 100mL deionized water to the system for dilution. It was then poured into 1000 mL of acetone for precipitation, washed several times, and then vacuum-dried at 40° C. for 8 h to obtain a sulfonated polyvinyl alcohol (SPVA) solid with a sulfonation degree of 10%.

[0032] (2) Preparation of yellowed polyvinyl alcohol solution: dissolving SPVA in deionized water to obtain an SPVA aqueous solution with a mass percentage of SPVA of 10%.

[0033] (3) Preparation of polyamic acid solution: Add PAA of the same q...

Embodiment 2

[0036] The concentrated sulfuric acid consumption that adds in the step (1) is 3mL, and all the other are with example 1. The proton conductivity of the proton exchange membrane is 7.1mS / cm, and the methanol permeability is 0.75×10 -7 cm 2 / s.

Embodiment 3

[0038] The concentrated sulfuric acid consumption that adds in the step (1) is 5mL, and all the other are with example 1. The proton conductivity of the proton exchange membrane is 7.4mS / cm, and the methanol permeability is 0.67×10 -7 cm 2 / s.

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Abstract

The invention discloses a composite proton exchange membrane. The composite proton exchange membrane is formed by a sulfonated polyvinyl alcohol solution with sulfonation degree of 10%-25% and a mixedsolution of the polyamide acid through casting membrane-forming, and is a composite membrane prepared by taking the polyimide as the matrix and taking the sulfonated polyvinyl alcohol as the dopant.The preparation material is extensive in source, simple in preparation process, simple in instrument preparation, and reduces the membrane-making cost. The sulfonated polyvinyl alcohol and the polyimide are compounded so as to weaken the conductivity drop of the proton, effectively reduce the methanol permeability of the composite proton exchange membrane and improving the comprehensive performance of the proton exchange membrane. A problem that the high methanol permeability is existent since the Nafion membrane produced by the Dupont company is used for a direct methanol fuel battery is solved, and the proton conductivity can satisfy the requirement on the proton exchange membrane by the direct methanol fuel battery; the exchange membrane can be used for the direct methanol fuel battery,and can be used for the direct ethanol fuel battery and like alcohol fuel batteries.

Description

Technical field: [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a proton exchange membrane used in a fuel cell for isolating positive and negative electrodes to prevent short circuit and a preparation method thereof. Background technique: [0002] At present, fuel cell has become a research and development hotspot in the international energy field, and its research and development will promote the rapid development of the entire electric vehicle, submarine and power generation industries. Proton exchange membrane is one of the key components of fuel cells, and its structure and performance determine the energy efficiency of fuel cells. The proton exchange membrane not only plays the role of isolating the positive and negative electrodes to prevent short circuit, but also allows charge carriers to pass through it to complete the electrochemical reaction during its use. [0003] Perfluorosulfonic acid proton exchange membranes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1046H01M8/1048H01M8/1069H01M8/1072
CPCY02E60/50
Inventor 汪映寒刘斌夏一帆
Owner SICHUAN UNIV
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