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Composite proton exchange membrane in use for fuel cell with low humidification and long service life

A proton exchange membrane and fuel cell technology, applied in fuel cells, fuel cell parts, battery pack parts, etc., can solve problems such as battery short circuit, achieve low permeability, good mechanical properties, and good self-humidification performance Effect

Inactive Publication Date: 2007-02-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

What's more serious is that the filled metal particles such as Pt may be connected locally to form a conductive network, causing a short circuit of the battery.

Method used

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  • Composite proton exchange membrane in use for fuel cell with low humidification and long service life
  • Composite proton exchange membrane in use for fuel cell with low humidification and long service life
  • Composite proton exchange membrane in use for fuel cell with low humidification and long service life

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Select an expanded polytetrafluoroethylene microporous membrane with an average thickness of 10 μm, an average pore diameter of 0.2 μm, and a porosity of 85%, and immerse it in isopropanol for cleaning and pre-swelling treatment. After drying, the membrane is clamped with a thin aluminum frame. Tight; mix 33ml of tetraethyl orthosilicate with 300ml of absolute ethanol evenly, then dropwise add 240ml of absolute ethanol and 60ml of hydrochloric acid with a molar concentration of 0.3M, and keep stirring at a temperature of 50°C for 12h to obtain Contains Nano SiO 2 aqueous solution; according to SiO 2 : Nafion  The mass ratio of the resin is 1:10 with nano-SiO 2 Aqueous solution and 5wt% Nafion  Solution (DuPont company product) mixed, ultrasonic 30min, prepared SiO 2 / Nafion solution; immerse the expanded polytetrafluoroethylene microporous membrane into the prepared SiO 2 / Nafion solution, after 20 minutes, take out the film, place it horizontally on a heating pl...

Embodiment 2

[0052] The preparation method of the multi-layer PEM is basically the same as in Example 1, except that the average thickness of the expanded polytetrafluoroethylene microporous membrane is 25 μm, the average pore diameter is 0.5 μm, and the porosity is 80%; the inorganic nanoparticles used are TiO 2 , the preparation method is as follows: add 25ml of glacial acetic acid to 100ml of tetrabutyl titanate, mix well, slowly pour into 600ml of water under vigorous stirring, continue stirring for 3h, after the hydrolysis is complete, add 10ml of 70wt% nitric acid , heated to 80°C and continued to stir for 2h to obtain nano-TiO 2 Colloidal solution; as TiO 2 : Nafion  The mass ratio of the resin to 1:5 will be nano-TiO 2 Colloid solution with 5wt% Nafion  The solution was mixed and ultrasonicated for 30min; the carbon-supported Pt electrocatalyst with a Pt loading of 40wt% was fully dispersed in TiO 2 In the Nafion solution, the mass ratio of Pt to solid polyelectrolyte is 0.0...

Embodiment 3

[0058] The multilayer PEM is basically the same as in Example 1, except that the expanded polytetrafluoroethylene microporous membrane used has an average thickness of 5 μm, an average pore diameter of 0.5 μm, and a porosity of 80%; the inorganic nanoparticles used are Zr (HPO 4 ) 2 , the preparation method is as follows: take zirconium oxychloride (ZrOCl) with a molar concentration of 1.5M 2 ) solution 100ml and the dehydrated alcohol of 400ml are evenly mixed, then dropwise add the mixed solution of the dehydrated alcohol of 400ml and 1M phosphoric acid 20ml, continue to stir 24h under the temperature of 80 ℃, obtain containing nanometer Zr (HPO 4 ) 2 Aqueous solution; according to Zr(HPO 4 ) 2 with Nafion  The mass ratio of the resin is 1:100 with nano-Zr(HPO 4 ) 2 Aqueous solution and 5wt% Nafion  The solution was mixed and ultrasonicated for 10 min; the carbon-supported Pt electrocatalyst with a Pt loading of 40wt% was fully dispersed in Zr(HPO 4 ) 2 / Nafion s...

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Abstract

The disclosed membrane as multi-layered proton exchange membrane composed of composite proton exchange membrane enhanced by two-layered porous polymer includes following parts from surface to inner side: inorganic Nano particles and thin membrane of solid polyelectrolyte, composite proton exchange membrane enhanced by porous polymer filled by inorganic Nano particles and solid polyelectrolyte, inorganic Nano particles and thin membrane of solid polyelectrolyte, inorganic Nano particles, Pt metal Nano particles and thin membrane of solid polyelectrolyte. The method includes following steps: pretreatment and fastening process for membrane of porous polymer, preparing solution, process of filling membrane of porous polymer, rolling membrane, coating inorganic particles, Pt particles and thin membrane of solid polyelectrolyte, superposing and hot-pressing membrane. The membrane possesses better mechanical property, anti-penetrability from reacting gas, self-humidifying property etc.

Description

technical field [0001] The invention relates to a composite proton exchange membrane for a fuel cell and a preparation method thereof, in particular to a multilayer proton exchange membrane and a preparation method thereof. The prepared multilayer proton exchange membrane has better water retention performance, self-humidification performance and resistance to reaction gas permeability. Background technique [0002] A fuel cell (Fuel Cell, FC) is an electrochemical power generation device that operates cleanly, efficiently and quietly. Proton Exchange Membrane Fuel Cell (PEMFC) has a good application prospect in industries such as mobile appliances and automobiles due to its low operating temperature and high specific power density. [0003] Most of the proton exchange membranes currently used in fuel cells require the presence of water to conduct protons, and the water produced by the cathode reaction is not enough to wet the entire membrane due to the weak back diffusion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02H01M2/14C08J5/22H01M8/0202H01M8/1041
CPCY02E60/12Y02E60/50
Inventor 木士春陈磊潘牧袁润章
Owner WUHAN UNIV OF TECH
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