Method for preparing methanol-resisting high-conductivity proton exchange membrane

A technology of proton exchange membrane and high conductivity, which is applied in the direction of chemical instruments and methods, circuits, electrical components, etc. It can solve the problems of decreased proton conductivity and high methanol permeability, so as to improve proton conductivity, promote transmission and maintain protons The effect of conduction

Active Publication Date: 2013-02-13
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the fluorine-containing sulfonic acid type proton exchange membrane prepared by the existing method has high methanol permeability and is accompanied by a decrease in proton conductivity, the present invention provides an alcohol-resisting type that can reduce the amount of methanol permeation while maintaining proton conductivity. Preparation method of high conductivity proton exchange membrane

Method used

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  • Method for preparing methanol-resisting high-conductivity proton exchange membrane
  • Method for preparing methanol-resisting high-conductivity proton exchange membrane
  • Method for preparing methanol-resisting high-conductivity proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Nafion ? Preparation of Alcohol-resisting Film by Layer-by-Layer Assembly of 117 Film

[0035] Nafion ? 117 membranes were sequentially soaked in 5 wt% H 2 o 2 , deionized water, and 1 mol / L dilute sulfuric acid solution, soak for 30 minutes each, take out, blow dry with nitrogen, and set aside;

[0036] Put 5 pieces of Nafion with the size of 5cm×5cm after the above treatment ? Immerse the 117 membrane in an aqueous solution of polydiallyldimethylammonium chloride (PDDA) with a concentration of 7wt% by mass, take it out after soaking for 25 minutes at 30°C, and rinse off the Nafion with deionized water. ? 117 PDDA physically adsorbed on the surface of the film, blown dry with nitrogen, and then Nafion ? The 117 membrane was immersed in a polyelectrolyte SPES aqueous solution with a concentration of 0.1wt% by mass percentage, soaked at 20°C for 30 minutes, then took it out, and rinsed off the Nafion with deionized water. ? 117 The polyelectrolyte SPES wi...

Embodiment 2

[0041] Example 2 Flemion ? Layer-by-layer assembly of films and preparation of alcohol barrier films

[0042] Will Flemion ? The membranes were sequentially soaked in 5 wt% H 2 o 2 , deionized water, and 1 mol / L dilute sulfuric acid solution, soak for 30 minutes each, take out, blow dry with nitrogen, and set aside;

[0043] Take 5 pieces of 5cm×5cm Flemion after the above treatment ? The membrane was immersed in an aqueous solution of polyethyleneimine (LPEI) with a concentration of 0.9wt% by weight, soaked at 50°C for 10 minutes, then taken out, and rinsed with deionized water to remove the Flemion ? LPEI physically adsorbed on the surface of the membrane, blown dry with nitrogen, and then Flemion ? The membrane was immersed in a 2wt% polyelectrolyte SPES aqueous solution containing asymmetric charges, soaked at 50°C for 25 minutes, then took it out, and rinsed the Flemion with deionized water. ? Polyelectrolyte SPES containing asymmetric charges physically adsorbed on...

Embodiment 3

[0048] Example 3 Dow ? Layer-by-layer assembly of films and preparation of alcohol barrier films

[0049] Dow ? The membranes were sequentially soaked in 5 wt% H 2 o 2 , deionized water, and 1 mol / L dilute sulfuric acid solution, soak for 30 minutes each, take out, blow dry with nitrogen, and set aside;

[0050] Put 5 pieces of 5cm×5cm Dow after the above treatment ? The membrane was immersed in a poly(allylamine hydrochloride) (PAH) aqueous solution with a mass percentage concentration of 5wt%, and was soaked at 40°C for 20 minutes before being taken out, and the Dow was rinsed with deionized water. ? PAH physically adsorbed on the surface of the membrane, blown dry with nitrogen, and then Dow ? The membrane was immersed in an aqueous solution of polyelectrolyte SPES with a concentration of 1 wt% containing asymmetric charges, soaked at 25°C for 10 minutes, then took it out, and rinsed off the Dow with deionized water. ? Polyelectrolyte SPES containing asymmetric charge...

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Abstract

The invention provides a method for preparing a methanol-resisting high-conductivity proton exchange membrane, relates to the technical field of fuel cell diaphragms, and solves the problem that the methanol permeability of a proton exchange membrane containing fluorosulfuric acid is high and reduces along with proton conductivity. The method comprises the steps of soaking the proton exchange membrane which is pre-processed and contains fluorosulfuric acid into 0.1%-5% by weight of polyelectrolyte SPES aqueous solution containing asymmetric electric charges at the temperature of 20-80 DEG C for 10-40 minutes, using deionized water to wash off SPES on the membrane surface, using nitrogen to blow the membrane dry, soaking the membrane into 0.05%-10% by weight of polycation compound aqueous solution at the temperature of 20-60 DEG C for 10-40 minutes, using the deionized water to flush off a compound on the membrane surface, using the nitrogen to blow the membrane dry, repeating the process, and assembling 5-100 layers of membranes to prepare the methanol-resisting high-conductivity proton exchange membrane. By means of the method, the methanol permeating amount can be reduced, and simultaneously the proton conductivity can be improved.

Description

technical field [0001] The invention relates to the technical field of fuel cell diaphragms, in particular to a method for preparing an alcohol-resisting high-conductivity proton exchange membrane. Background technique [0002] Direct Methanol Fuel Cell (DMFC) is favored by the industry because of its abundant methanol source, easy portability and storage, and zero or low emission. The proton exchange membrane is the core component of DMFC, and its performance directly determines the performance of the battery. The basic requirement for the proton exchange membrane is that it has sufficient proton conductivity and can effectively prevent methanol from penetrating from the anode to the cathode of the battery. [0003] At present, the proton exchange membrane widely used in DMFC is fluorine-containing sulfonic acid type proton exchange membrane, such as DuPont's Nafion ? Series Membranes, Aciplex from Asahi Chemical ? Series membrane, Flemion by Asahi Glass ? series of mem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B38/08H01M2/16H01M2/08C08J7/00
CPCY02E60/12Y02E60/10
Inventor 李胜海张所波
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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