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Preparation method of polymer electrolyte membrane electrode

An electrolyte membrane electrode and electrolyte membrane technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of poor stability, short service life, performance degradation of membrane electrodes, etc., to improve electrical performance, reduce fuel transmission rate, The effect of improving binding force

Active Publication Date: 2012-10-10
TSINGHUA UNIV
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Problems solved by technology

[0004] The purpose of the invention is to propose a new method for preparing polymer electrolyte membrane electrodes, to overcome the problems of membrane electrode performance reduction, poor stability and short service life due to the swelling of the proton exchange membrane in the prior art, so that the prepared by this method The polymer electrolyte membrane electrode produced will not cause swelling and wrinkling of the proton exchange membrane, and can also make the catalyst particles fully contact with the proton exchange membrane, thereby increasing the adhesion and binding force of the catalyst and improving the utilization rate of the catalyst. Then improve the overall performance of the membrane electrode and prolong its long service life

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  • Preparation method of polymer electrolyte membrane electrode
  • Preparation method of polymer electrolyte membrane electrode
  • Preparation method of polymer electrolyte membrane electrode

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preparation example Construction

[0019] The preparation method of the polymer electrolyte membrane electrode provided by the present invention adopts the "heat setting method" to fix the proton exchange membrane, that is, the proton exchange membrane is flatly spread on the substrate and heated to the glass transition temperature, generally the polymer electrolyte membrane is heated to the glass transition temperature Within the range of ±20 degrees; make the proton exchange membrane in a viscous flow state close to melting, and then perform casting, printing or spraying of the catalyst slurry. The solvent in the catalyst slurry evaporates instantly at high temperature, which will not cause the proton exchange membrane to swell and become wrinkled, and the catalyst particles will be in full contact with the proton exchange membrane that is close to the molten state, so that the catalyst and the proton exchange membrane can be combined It is more compact, increases the binding strength of the membrane electrode...

Embodiment 1

[0027] A perfluorosulfonic acid resin membrane with a thickness of 50 microns was selected, fixed on a porous stainless steel plate and heated to 120 degrees (glass transition temperature was 135 degrees), and kept heating slowly to maintain a viscous flow state. The Pt / C (40%) catalyst, 5% perfluorosulfonic acid resin and isopropanol that take by weighing, make the mass ratio of Pt / C catalyst: perfluorosulfonic acid resin: isopropanol be 1: 10: 500, ultrasonic Shake for 8 minutes to form the catalyst solution to be sprayed, take 1.000g of the solution in 500ml.min -1 .cm -2 At the same time, the commercial carbon paper was soaked in 30% PTFE emulsion for 1 minute, and then sintered in a muffle furnace at 340 °C for 90 minutes to form a hydrophobic carbon paper, which will contain 10% PTFE carbon powder paste is coated on the hydrophobically treated carbon paper, and the coated carbon powder load is 1.0mg / cm 2 , and finally the gas diffusion layer coated with a carbon layer ...

Embodiment 2

[0029] A 60-micron-thick acid-doped polybenzimidazole membrane was selected, fixed on a porous stainless steel plate and heated to 420 degrees (the glass transition temperature was 430 degrees), and kept heating slowly to maintain a viscous flow state. The Pt / C (40%) catalyst that weighs, 5% polybenzimidazole membrane resin and Virahol make Pt / C catalyst: the mass ratio of acid-doped polybenzimidazole resin: Virahol is 1: 10 : 500, ultrasonic vibration for 8 minutes to form the catalyst solution to be sprayed, take 1.000g of the solution in 100ml.min -1 .cm -2 At the same time, the commercial carbon paper was soaked in 30% PTFE emulsion for 1 minute, and then placed in a muffle furnace at 340°C for 90 minutes to form a hydrophobic carbon paper. Paper, the carbon powder paste containing 10% PTFE is coated on the carbon paper after hydrophobic treatment, and the coated carbon powder load is 1.0mg / cm 2 , and finally the gas diffusion layer coated with a carbon layer and the pro...

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Abstract

The invention relates to a preparation method of a polymer electrolyte membrane electrode, which belongs to the technical field of preparation of fuel cells in the electrochemical industry. The preparation method comprises the steps of firstly heating a polymer electrolyte membrane to the glass transition temperature, and leading the polymer electrolyte membrane to achieve the viscous flow state approaching melting; further configuring mixture of a catalytic layer to slurry according to a certain proportion, and preparing a membrane electrode three-in-one component which consists of the catalytic layer / the polymer electrolyte membrane / the catalytic layer and is formed on two sides of the polymer electrolyte membrane; and then heat-pressing a diffusion layer after pretreatment and the three-in-one component to form a five-in-one membrane electrode component with the diffusion layer. The preparation method can overcome the problems of low performances of the membrane electrode, poor stability, short service life and the like caused by swelling of a proton exchange membrane in the traditional preparation of the membrane electrode by adopting the fixed proton exchange membrane formed by the heat-setting method, lead the binding between a catalyst and the proton exchange membrane to be closer, further improve the adhesion and the binding force of the catalyst, further improve the comprehensive performances of the membrane electrode and prolong the service life of the membrane electrode.

Description

technical field [0001] The invention relates to a preparation method of an electrolyte membrane electrode, which is suitable for proton exchange membrane fuel cell (PEMFC), direct methanol fuel cell (DMFC), alkaline fuel cell (AFC), electrolyzed water hydrogen production device and regenerative fuel cell (RFC) ) and other electrochemical device membrane electrode preparation. Background technique [0002] As an efficient and environmentally friendly power generation device that directly converts chemical energy into electrical energy through electrochemical reactions, fuel cells have broad application prospects in small and medium-sized power stations, electric vehicles, and portable power supplies. At the same time, the reverse process electrolysis water hydrogen production device of the fuel cell can easily produce high-purity hydrogen without carbon monoxide, sulfide and nitride from water, which is widely used in chemical industry, energy, electronics, metallurgy, food, ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/00
Inventor 王诚刘志祥毛宗强
Owner TSINGHUA UNIV