Polyfurfuralcohol modified fuel cell proton exchange membrane and modification method thereof

A proton exchange membrane and fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve problems such as difficulties in the synthesis and sulfonation of perfluorinated substances, high temperature and water content requirements, and obstacles to electrode reaction speeds. Effects of sulfonic acid group grafting barrier, improving water retention performance, and increasing the number of sulfonated ions grafted

Active Publication Date: 2018-06-08
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Nafion® membranes still have the following disadvantages: (1) Difficult to manufacture and high cost, and the synthesis and sulfonation of perfluorinated substances are very difficult, and the hydrolysis and sulfonation during the film formation process will easily denature and degrade the polymer , making it difficult to form a film, resulting in higher costs; (2) High requirements on temperature and water content, the best working temperature of Nafion® series film is 70-90 ℃, exceeding this temperature will make its water content drop sharply, and the conductivity The rapid decline hinders the problem of increasing the electrode reaction rate and overcoming catalyst poisoning by appropriately increasing the operating temperature; (3) Some hydrocarbons, such as methanol, have high permeability and are not suitable for direct methanol fuel cells (DMFC ) proton exchange membrane
[0008] It can be seen that the existing proton exchange membrane fuel cell (PEFMC) has been paid close attention by researchers due to its excellent theoretical performance. However, in the actual preparation and use process, Nafion membrane still has high methanol permeability, difficult sulfonation, Modification can easily lead to the reduction of proton mobility and other problems that affect its practical use

Method used

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  • Polyfurfuralcohol modified fuel cell proton exchange membrane and modification method thereof

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Effect test

Embodiment 1

[0032] The steps of polyfurfuryl alcohol modified fuel cell proton exchange membrane prepared by the present invention are as follows:

[0033] a. Make glucosamine, furfuryl alcohol, and chloromethyl methyl ether into a sol respectively. The specific method is: respectively heat glucosamine, furfuryl alcohol, and chloromethyl methyl ether at 30°C for 30 minutes at a heating rate of 8°C / min Raise the temperature to 100°C, keep it warm for 3 hours, then cool it down to 65°C at a cooling rate of 12°C / min, keep it warm for 1 hour, then soak in 3% sodium hydroxide solution for 60 minutes, add hydrochloric acid to neutralize, add Linking agent, stirring and crosslinking at 40°C for 8 hours, adding a reducing agent for reduction, to obtain glucosamine sol, furfuryl alcohol sol and chloromethyl methyl ether sol; among them, the crosslinking agent is formaldehyde, glutaraldehyde, glyoxal, ethylene glycol At least one of the bisglycidyl ethers; the reducing agent is sodium borohydride; ...

Embodiment 2

[0043] The steps of polyfurfuryl alcohol modified fuel cell proton exchange membrane prepared by the present invention are as follows:

[0044] a. Make glucosamine, furfuryl alcohol, and chloromethyl methyl ether into a sol respectively. The specific method is: respectively heat glucosamine, furfuryl alcohol, and chloromethyl methyl ether at 30°C for 20 minutes, with a heating rate of 7°C / min Raise the temperature to 110°C, keep it warm for 5 hours, then cool it down to 60°C at a cooling rate of 15°C / min, keep it warm for 1 hour, then soak in 0.5% sodium hydroxide solution for 60 minutes, add hydrochloric acid to neutralize, add Linking agent, stirring and crosslinking at 50°C for 8 hours, adding a reducing agent for reduction, to obtain glucosamine sol, furfuryl alcohol sol and chloromethyl methyl ether sol; among them, the crosslinking agent is formaldehyde, glutaraldehyde, glyoxal, ethylene glycol At least one of the bisglycidyl ethers; the reducing agent is sodium borohydr...

Embodiment 3

[0051] The steps of polyfurfuryl alcohol modified fuel cell proton exchange membrane prepared by the present invention are as follows:

[0052] a. Make glucosamine, furfuryl alcohol, and chloromethyl methyl ether into a sol respectively. The specific method is: respectively heat glucosamine, furfuryl alcohol, and chloromethyl methyl ether at 35°C for 20 minutes at a heating rate of 6°C / min Raise the temperature to 90°C, keep it warm for 5 hours, then cool it down to 70°C at a cooling rate of 15°C / min, keep it warm for 2 hours, then soak in 2% sodium hydroxide solution for 50 minutes, add hydrochloric acid to neutralize, add Linking agent, stirring and crosslinking at 50°C for 10 hours, adding a reducing agent for reduction, to obtain glucosamine sol, furfuryl alcohol sol and chloromethyl methyl ether sol; among them, the crosslinking agent is formaldehyde, glutaraldehyde, glyoxal, ethylene glycol At least one of the bisglycidyl ethers; the reducing agent is sodium borohydride;...

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Abstract

The invention belongs to the technical field of fuel cells, and concretely relates to a polyfurfuralcohol modified fuel cell proton exchange membrane and a modification method thereof. The method comprises the following steps: a, respectively preparing sols from glucosamine, furfuralcohol and chloromethyl methyl ether, and sequentially uniformly coating two sides of a Nafion membrane to obtain a composite membrane layer; b, performing microwave irradiation drying on the composite membrane layer under the protection of N2 until all sol layers in the composite membrane are solidified; and c, immersing a composite membrane obtained after the solidification in a phosphoric acid solution for 12-24 h, taking out the composite membrane, washing the composite membrane with water, drying the washedcomposite membrane, and peeling surface residual gel to obtain the polyfurfuralcohol modified fuel cell proton exchange membrane. The polyfurfuralcohol modified fuel cell proton exchange membrane hasthe advantages of high chemical stability, high mechanical strength and excellent electric conductivity.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a polyfurfuryl alcohol modified fuel cell proton exchange membrane and a modification method thereof. Background technique [0002] Proton Exchange Membrane Fuel (PEM) is the core component of PEMFC, and PEM is different from the diaphragm used in general chemical power sources. Proton exchange membrane fuel cells have become the most competitive clean alternative power source for gasoline internal combustion engines. The material used as PEM should meet the following conditions: good proton conductivity, small electroosmosis of water molecules in the membrane, as little gas permeability in the membrane as possible, good electrochemical stability, good dry-wet conversion performance, It has certain mechanical strength, good machinability and reasonable price. [0003] Proton exchange membrane fuel cells have the advantages of low operating temperature, fast start...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01M8/1018H01M8/1069H01M8/1086
CPCH01M8/1018H01M8/1069H01M8/1086Y02E60/50
Inventor陈庆廖健淞
OwnerCHENDU NEW KELI CHEM SCI CO LTD