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Fuel cell membrane electrode with renewable function and preparation method thereof

A fuel cell membrane and electrode technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of complex preparation process, no substantial breakthrough in long-life catalysts, and expensive carbon nanotubes.

Inactive Publication Date: 2010-07-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in fact, in addition to the improvement of the stability of the support, the problem of agglomeration of metal catalysts caused by dissolution, diffusion or migration is still difficult to fundamentally solve.
Moreover, using carbon nanotubes as catalyst supports, in addition to the complicated preparation process, carbon nanotubes themselves are also very expensive.
Therefore, it can be said that no substantial breakthrough has been made in the development of long-lived catalysts.

Method used

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  • Fuel cell membrane electrode with renewable function and preparation method thereof
  • Fuel cell membrane electrode with renewable function and preparation method thereof
  • Fuel cell membrane electrode with renewable function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation steps of the fuel cell membrane electrode with the catalyst layer having a regenerative function are as follows:

[0037] 1. Preparation of porous carbon slurry

[0038] The domestic activated carbon fiber (specific surface area 1000~1600m 2 / g) with 20wt% H 2 o 2 The solutions were mixed, treated at room temperature for 2 hours, then filtered, rinsed with deionized water, and dried at 100°C for 15 hours. Get the domestic activated carbon fiber of 2.5g oxidation treatment and 19ml 5wt% perfluorosulfonic acid proton exchange resin solution ( DuPont Company) was mixed with 35ml 5% ethanol / deionized aqueous solution, stirred at high speed for 1 hour, and ultrasonically dispersed for 25 minutes;

[0039] 2. Preparation of porous carbon adsorption layer

[0040] The porous carbon slurry is coated on the surface of the gas diffusion layer electrode as the cathode, and dried at 100°C for 12 hours, and the average thickness of the dry coating is about 4 μm...

Embodiment 2

[0050] The preparation steps of the fuel cell membrane electrode with the catalyst layer having a regenerative function are as follows:

[0051] 1. Preparation of porous carbon slurry

[0052] Conductive activated carbon Vulcan XC-72 (produced by U.S. Cabot Company) and 71% HClO 4 Oxidants are mixed, reflux at room temperature for 3-4 hours, then filtered, cleaned with deionized water, and dried at 80-90°C for 15 hours, take 1.5g of oxidized activated carbon and 7ml of 5wt% The solution was mixed with 20ml of deionized aqueous solution, stirred at high speed for 0.5 hours, and ultrasonically dispersed for 10 minutes;

[0053] 2. Preparation of porous carbon adsorption layer

[0054] Same as Example 1, except that the average thickness of the dry coating is about 3 μm;

[0055] 3. Pretreatment of the gas diffusion layer

[0056] Immerse Toray carbon paper in polytetrafluoroethylene hydrophobizing agent for 5 minutes, and calcined at 350°C for 20 minutes, the content of pol...

Embodiment 3

[0064] The preparation steps of the fuel cell membrane electrode with the catalyst layer having a regenerative function are as follows:

[0065] 1. Preparation of porous carbon slurry

[0066] Domestic coconut shell carbon (specific surface area greater than 1000m 2 / g) with 20% H 2 o 2 The solutions were mixed, treated at room temperature for 2 hours, then filtered, rinsed with deionized water, and dried at 90°C for 20 hours. Take 4.0g of oxidized coconut shell carbon and 90ml of 5wt% Flemion solution, and mix with 240ml of deionized water Mixing, high-speed stirring for 0.5 hours, and ultrasonic dispersion for 15 minutes;

[0067] 2. Preparation of porous carbon adsorption layer

[0068] The porous carbon slurry was coated on the side of NRE 212CS as the cathode, and dried at 100°C for 20 hours, and the average thickness of the dry coating was about 2 μm;

[0069] 3. Pretreatment of the gas diffusion layer

[0070] Same as embodiment 2;

[0071] 4. Preparation of gas ...

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Abstract

The invention relates to a fuel cell membrane electrode with a renewable function and a preparation method thereof. The fuel cell membrane electrode with the renewable function is characterized in that a porous carbon adsorption layer is additionally arranged between a catalyst layer at the cathode side of the membrane electrode and a proton exchange membrane, wherein the porous carbon adsorption layer is composed of porous carbon materials and perfluorosulfonic acid proton exchange resin. Different from the background art, in the invention, the porous carbon adsorption layer is additionally arranged between the cathodic catalyst layer of the traditional fuel cell and the proton exchange membrane, thereby adsorbing or intercepting metal particles or ions which are transferred or diffused into the membrane to achieve the purpose of preventing the metal particles or ions from being transferred to the membrane side or into the membrane. Meanwhile, more importantly, catalyst noble metal particles (comprising metal particles adsorbed by transferring and metal particles generated after catalyst noble metal ions are reduced) which are adsorbed by the porous carbon adsorption layer can be also deposited on the porous carbon adsorption layer to form a new catalyst layer, thereby improving the service life of the fuel cell membrane electrode.

Description

technical field [0001] The invention relates to a fuel cell membrane electrode and a preparation method thereof, in particular to a fuel cell membrane electrode with a regenerable catalyst layer and a preparation method thereof. The membrane electrode has good battery performance and long service life. Background technique [0002] Fuel cells have the advantages of high energy conversion efficiency and zero emissions, so they are considered to be ideal energy conversion devices and power sources in the future. Among them, the proton exchange membrane fuel cell (PEMFC) undoubtedly has more development prospects because of its good low-temperature startability and the application of hydrogen as an energy source. In the past ten years, fuel cell technology has been greatly developed, and fuel cell vehicles, mobile fuel cell power supplies, household fuel cell power stations, etc. have been launched in the world, but there is still a long way to go before the fuel cell industry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 木士春陈小晶
Owner WUHAN UNIV OF TECH
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