High temperature proton exchange film for fuel cell and method for making same

A proton exchange membrane, fuel cell technology, applied in fuel cells, fuel cell parts, solid electrolyte fuel cells, etc., can solve the problems of decreased proton concentration, no alcohol barrier properties, and decreased conductivity of the diaphragm

Active Publication Date: 2008-05-21
MEISHAN INDIGO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

H.Y.Chang, C.W.Lin.Proton conductingmembranes based on PEG / SiO 2 Nanocomposites for direct methanol fuel cells.Journal of Membrane Science 218, (2003) disclosed organic-inorganic composite membrane PEG / SiO 2 When the membrane is used at high temperature, the thermal movement of the polyethylene glycol segment is accelerated, the high crystallinity of the polymer is overcome, and a quasi-liquid conductor for proton conduction is formed, thereby improving the conductivity of the proton exchange membrane, but , the proton donor of the membrane is dodecylbenzenesulfonic acid, which has good water solubility, but does not have the performance of alcohol inhibition. When used in an environment with water, dodecylbenzenesulfonic acid will dissolve in water And gradually lost, resulting in a decrease in the concentration of protons in the diaphragm, which eventually leads to a decrease in the conductivity of the diaphragm; in addition, due to the low mechanical and mechanical properties of polyethylene glycol, it cannot play a supporting role in the fuel cell and is not suitable for high-temperature fuel cells. practical application value

Method used

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  • High temperature proton exchange film for fuel cell and method for making same
  • High temperature proton exchange film for fuel cell and method for making same
  • High temperature proton exchange film for fuel cell and method for making same

Examples

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Embodiment 1

[0046] The preparation (SFS) of embodiment 1 proton exchange membrane of the present invention

[0047] Weigh 30 grams of polyvinylidene fluoride and add it into 300 ml of tetrahydrofuran dissolved in sulfuric acid, the concentration of sulfuric acid is 3M, and keep stirring, raise the temperature to 70°C and keep it for 3 hours. After the polymer was completely dissolved, the solution was naturally cooled to room temperature for later use. 1.25 moles of vinyltrimethoxysilane were added to a mixture of 1 mole of polyethylene glycol monomethyl ether (molecular weight: 750) and 1.5 grams of catalyst (ammonium persulfate), and the reaction temperature was kept at 60 ° C. After 80 hours of reaction Finally, polyethylene glycol monomethyl ether terminated by a silane coupling agent was prepared for future use. A mixture of capped polyethylene glycol monomethyl ether and tetraethoxysilane (1:1 molar ratio) was used as nano-SiO 2 After mixing the precursors evenly, add them into 30...

Embodiment 2

[0048] Embodiment 2 The preparation (PFS) of proton exchange membrane of the present invention

[0049] Weigh 30 grams of polyvinylidene fluoride and add it into 250 ml of tetrahydrofuran dissolved in phosphoric acid, the concentration of phosphoric acid is 2M, and keep stirring, raise the temperature to 70°C and keep it for 3 hours. After the polymer was completely dissolved, the solution was naturally cooled to room temperature for later use. 1.25 moles of vinylmethyldimethoxysilane were added to a mixture of 1 mole of polyethylene glycol monomethyl ether (molecular weight: 750) and 1.5 grams of catalyst (ammonium persulfate), and the reaction temperature was maintained at 60 ° C during the reaction After 80 hours, polyethylene glycol monomethyl ether capped with a silane coupling agent was prepared for use. After mixing the end-capped polyethylene glycol monomethyl ether and tetraethoxysilane (the molar ratio is 3:7) as the precursor of nano-silica, add it to 200ml deioniz...

Embodiment 3

[0050] Embodiment 3 The preparation (SGS) of proton exchange membrane of the present invention

[0051] Weigh 25 g of polyvinyl alcohol and add it into 200 ml of aqueous solution containing sulfuric acid, the concentration of sulfuric acid is 3 M, and keep stirring, then raise the temperature to 90° C. and keep it for 3 hours. After the polymer is completely dissolved, the solution is naturally cooled to room temperature, and the polymer in the obtained solution is precipitated with acetone, a non-good solvent, to remove the reacted acid. After the obtained precipitate is dried to constant weight, it is dissolved in 300ml of A solution with a mass fraction of about 10% was obtained in ionized water for subsequent use. Add 1.25 moles of vinyltrimethoxysilane to a mixture of 1 mole of polyethylene glycol monomethyl ether (molecular weight is 750) and a certain amount of catalyst, and the reaction temperature is kept at 60°C. The polyethylene glycol monomethyl ether blocked by t...

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Abstract

The invention relates to a high-temperature proton exchange membrane for fuel cells and a preparation method thereof, belonging to the technical field of fuel cells. The matrix of the high-temperature proton exchange membrane provided by the invention is composed of acidified organic polymers and nano-inorganic particles uniformly dispersed in the polymer matrix, and the surface of the inorganic particles is coated with a polymer capable of solvating protons; wherein the acidified The organic polymer is used as a proton donor, and the polymer coated with ether oxygen group on the surface of the inorganic particle has a solvation effect on the proton to generate free protons, and the acidified organic polymer and the inorganic particle coated with the ether oxygen polymer are mutually incompatible. Compatible, the formed phase interface provides a convenient channel for proton transport. This high-temperature proton exchange membrane for fuel cells does not depend on the existence of water under high-temperature conditions and has high proton conductivity, excellent alcohol resistance performance, mechanical properties, and low cost, and provides an industrially practical membrane for the fuel cell field. permanent proton exchange membrane.

Description

technical field [0001] The invention relates to a high-temperature proton exchange membrane for fuel cells and a preparation method thereof, belonging to the technical field of fuel cells. Background technique [0002] A fuel cell is a device that converts chemical energy stored in fuel and oxidant directly into electrical energy. The difference from conventional batteries is that as long as fuel and oxidant are supplied, there will be continuous power output. Fuel cells produce almost no NO x and SO x emissions. Moreover, CO 2 Emissions are also reduced by over 40% compared to conventional power plants. At the same time, it also has the advantages of fast start-up, long battery life, high specific power, and high specific energy. These characteristics determine that it is used in fixed power generation systems, on-site power supplies, distributed power supplies, space vehicle power supplies, portable electronic products, and vehicle power supplies. It has broad applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M2/16H01M8/10C08J5/22H01M8/1041H01M8/1081
CPCY02E60/12Y02E60/522Y02P70/50Y02E60/50
Inventor 邓正华潘中来马志刚高建东李仁贵邓佳闽王璐索继栓
Owner MEISHAN INDIGO TECH CO LTD
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