Method for preparation of organic/inorganic composite proton exchanging membrane used for fuel cell

A technology of proton exchange membrane and inorganic compounding, which is applied to fuel cell parts, fuel cells, solid electrolyte fuel cells, etc., can solve the problems of low proton conductivity, achieve high strength, excellent proton conductivity, and reduce production costs Effect

Inactive Publication Date: 2008-06-25
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the polysulfone amide material not only has the advantages of polysulfone materials, but also has the characteristics of polyamide materials. It is a membrane material with excellent heat resistance, acid and alkali resistance, high oxidation resistance and high strength. However, due to its proton conductivity Low, there is no report on its use in proton exchange membranes

Method used

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  • Method for preparation of organic/inorganic composite proton exchanging membrane used for fuel cell

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Experimental program
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Effect test

Embodiment 1

[0022] Weigh 1g of polysulfone amide, wash and dry, add DMAC, heat and dissolve to form a DMAc solution with a concentration of 15% PSA, add 0.1g of phosphotungstic acid powder while stirring, stir well, drop by drop while stirring Add 0.15g nano-SiO 2 Silica sol (phosphotungstic acid and SiO 2 The weight ratio of the total amount to polysulfone amide is 20:80, that is, phosphotungstic acid and SiO 2 20% of the total weight. Among them, phosphotungstic acid accounts for 8% of the total weight, SiO 2 was 12%), and evenly vibrated with ultrasonic waves. Adjust the first homogenizing speed of the KW-4A desktop homogenizer to 600 rpm and the second homogenizing speed to 1800 rpm, and place the special thin 3cm×3cm square glass piece on the suction cup of the homogenizer , Align the center of the suction cup and the glass sheet, turn on the glue homogenizer and drop the mixed solution onto the glass sheet at the same time, after coating evenly, put the glass sheet with the mixe...

Embodiment 2

[0025] According to the method described in Example 1, 30% phosphotungstic acid and SiO are mixed in the DMAc solution of 10% PSA 2 , of which phosphotungstic acid accounts for 13.5% of the total weight, SiO 2 It accounts for 16.5%, and the film is prepared according to the method of Example 1 after shaking evenly. The measured proton conductivity of the membrane at 90°C is 2.01×10 -2 S / cm, the water content of the film is 34.21%, the swelling degree is 3.6%, the tensile breaking strength is 34.2Mpa, the breaking elongation is 20.6%, and the thermal decomposition temperature is about 420°C.

Embodiment 3

[0027] According to the method described in Example 1, in the DMAc solution of 20% PSA, mix 40% phosphotungstic acid and SiO 2 , where phosphotungstic acid accounts for 16% of the total weight, SiO 2 Accounting for 24%, the film was prepared according to the method of Example 1 after shaking evenly. The measured proton conductivity of the membrane at 90°C is 2.43×10 -2 S / cm, the water content of the film is 39.01%, the swelling degree is 3.6%, the tensile breaking strength is 29.9Mpa, the breaking elongation is 17.1%, and the thermal decomposition temperature is about 420°C.

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Abstract

The invention relates to a preparation method of an organic / inorganic compound proton exchange membrane used for a fuel battery. The method comprises the following steps: firstly, N, N-dimethyl acetamide solution with 10 to 20 percent of polysulfone amide is prepared, phosphotungstic acid powder is added into the solution, silica sol is added after the solution is uniformly mixed, ultrasound treatment is performed, and the ratio of the general weight of the phosphotungstic acid and SiO2 and the weight of the polysulfone amide is 20:80 to 50:50; secondly, the glue spreading speed of a spin coater is adjusted, the mixed liquor polysulfone amide, the phosphotungstic acid and the SiO2 which are uniformly mixed is dropped on a glass plate, membrane production is performed, and after the membrane is dried, the membrane is put in a water bath to be stripped. The process of the method is simple, the production cost is low, and large scale production can be performed, all the water ratio, the mechanical strength and the thermal stability of the prepared exchange membrane reach or exceed the perfluorosulfonic acid Nafion membrane.

Description

technical field [0001] The invention belongs to the field of proton exchange membranes, in particular to a method for preparing an organic / inorganic composite proton exchange membrane for fuel cells. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) uses hydrogen or methanol as fuel to directly convert the chemical energy of the fuel into electrical energy. It has the characteristics of high energy conversion rate, no noise, and no pollution to the environment. It is a promising high-efficiency Energy devices, which can be widely used in vehicle, stationary and mobile power sources. [0003] The proton exchange membrane is the core component of PEMFC, and its role in the fuel cell is double: as an electrolyte to provide hydrogen ion channels, as a diaphragm to isolate the two poles of the reaction gas. Because it operates in the presence of acidic and strong oxidants, proton exchange membranes for fuel cells are required to have the following properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/10H01M2/16C08J5/22C08J5/18H01M8/1046H01M8/1051
CPCY02E60/521Y02P70/50Y02E60/50
Inventor 李卫东徐红费国平赵炯心
Owner DONGHUA UNIV
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