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Preparation of SiO2/organic polymer composite proton exchange membrane

A polymer, proton membrane technology, applied in fuel cell components, fuel cells, cells, etc., can solve the problems of increased production cost of composite membranes, complex synthesis process operations, and reduced electrical conductivity, etc. The effect of low rate and high mechanical strength

Inactive Publication Date: 2012-07-04
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The membrane prepared by this method is uniform, and the permeability of methanol and water of the membrane is significantly reduced, but the price is that the electrical conductivity is also reduced (only the reduction is not as large as the reduction of methanol permeability), on the other hand, but The conductive polymer in this method needs to be modified first, which not only complicates the synthesis process, but also increases the production cost of the composite film.

Method used

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  • Preparation of SiO2/organic polymer composite proton exchange membrane
  • Preparation of SiO2/organic polymer composite proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment one, one of the preparation of SiOx (OH) y (OR) z alcohol sol

[0032] Mix 150 ml tetraethyl orthosilicate (TEOS), 50 ml ethanol and 18.2 ml 0.5M HCl aqueous solution, stir and react for about 1 hour to obtain colorless and transparent SiOxH 2 O·y(OR)z (incompletely hydrolyzed and condensed organic silicate) alcohol sol. The Zetasizer Nano-ZS laser particle size analyzer of Malvern Instruments Co., Ltd. is used to measure and analyze the particle size of the synthesized sol. The particle size is between 1 and 5 nanometers. figure 1 .

Embodiment 2

[0033] Embodiment two, the preparation two of SiOx (OH) y (OR) z alcohol sol

[0034] Mix 150 mL of tetraethyl orthosilicate (TEOS), 100 mL of methanol, and 12.1 mL of 1.0M HNO 3 The aqueous solution was mixed, stirred and reacted for about 1 hour, and a colorless and transparent SiOx·(OH)y(OR)z alcohol sol was obtained. The Zetasizer Nano-ZS laser particle size analyzer of Malvern Instruments Company showed that the particle size of the synthesized sol was also between 1 and 5 nanometers.

Embodiment 3

[0035] Embodiment three, the preparation three of SiOx (OH)y(OR)z alcohol sol

[0036] Mix 150 mL of orthomethylsilicate (TMOS), 100 mL of ethanol, and 12.1 mL of 1.0M HNO 3 The aqueous solution was mixed, stirred and reacted for about 1 hour, and a colorless and transparent SiOx·(OH)y(OR)z alcohol sol was obtained. The Zetasizer Nano-ZS laser particle size analyzer of Malvern Instruments Company showed that the particle size of the synthesized sol was also between 1 and 5 nanometers.

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Abstract

The invention provides a method for preparing SiO2 / organic polymer composite proton membrane. The method comprises the steps of subjecting ortho-silicate organic ester to partial hydrolysis and condensation under acid catalysis so as to synthesize SiO2-containing alcosol, compounding the alcosol with organic polymer proton conductive membrane liquid so as to prepare SiOx.(OH)y.(OR)z / organic composite proton exchange membrane, immersing the membrane in acidic water so as to completely hydrolyze OR radicals which are not hydrolyzed yet and preparing a SiOx.(OH)y / organic polymer composite proton exchange membrane. In the composite proton membrane prepared by the method, as SiOx.(OH)y is low in condensation degree, and as SiO2 exists as molecular groups not completely condensed and is completely dissolved in the membrane liquid and uniformly distributed in the composite membrane, the prepared composite membrane has the advantages of high composite-membrane mechanical strength, high proton conductivity, low water-absorption expansivity and low methanol permeation rate, and is a good fuel-cell proton membrane.

Description

technical field [0001] The present invention relates to SiO with proton conductivity 2 / Organic polymer composites, which can be used as solid electrolytes in electrochemistry, especially fuel cell proton membranes. Specifically, the present invention provides a SiO 2 / The preparation method of organic polymer composite proton exchange membrane. Background technique [0002] The proton membrane is a key building block of fuel cells. At present, the proton membranes of fuel cells are mainly perfluorosulfonic acid polymer membranes, such as the Nafion series solid proton membranes of DuPont (US Patent No. 3,282,875; US Patent No. 4,330,645, etc.). Due to the high price of perfluorosulfonic acid membranes, its application has been limited. In order to reduce the cost of fuel cells, people have been developing cheap and high-performance proton membranes. For example, sulfonated polytrifluorostyrene membranes described in US Patent No.5,422,411; sulfonated polyarylether keto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C08L81/06C08L71/00C08K3/36H01M8/02C25B1/46C25B9/10C25B9/23H01M8/1072H01M8/1081
CPCY02E60/50
Inventor 陈胜利纪志勇陈超
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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