Membrane electrode of long-life fuel cell with porous adsorption layer and preparation method thereof

A fuel cell membrane and porous adsorption technology, which is applied in the direction of fuel cells, battery electrodes, fuel cell components, etc., can solve the problems that proton exchange membranes hinder the life of fuel cells

Inactive Publication Date: 2010-10-06
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the degradation of the proton exchange membrane is still one of the key factors hindering the improvement of the life of the fuel cell.

Method used

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  • Membrane electrode of long-life fuel cell with porous adsorption layer and preparation method thereof
  • Membrane electrode of long-life fuel cell with porous adsorption layer and preparation method thereof
  • Membrane electrode of long-life fuel cell with porous adsorption layer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The preparation of a long-life fuel cell membrane electrode with a porous adsorption layer comprises the following steps:

[0037] 1. Preparation of palygorskite slurry

[0038] Get 3g palygorskite and 20ml 5wt% perfluorosulfonic acid proton exchange resin solution ( DuPont Company), and mixed with 50ml 5% ethanol / deionized aqueous solution, stirred at high speed for 1 hour, and ultrasonically dispersed for 20 minutes;

[0039] 2. Preparation of palygorskite adsorption layer

[0040] Coat the palygorskite slurry on the surface of the gas diffusion layer electrode and dry it at 100°C for 10 hours. The average thickness of the dry coating is about 4 μm;

[0041] 3. Pretreatment of the gas diffusion layer

[0042] The gas diffusion layer (Toray carbon paper) was impregnated with polytetrafluoroethylene hydrophobic agent (PTFE) for 10 minutes, and calcined at 350°C for 30 minutes, the content of polytetrafluoroethylene hydrophobic agent was 30wt%, and then, on one side ...

Embodiment 2

[0050] The preparation of a long-life fuel cell membrane electrode with a porous adsorption layer comprises the following steps:

[0051] 1. Preparation of sepiolite slurry

[0052] Mix 2g sepiolite and 8ml 5wt% The solution was mixed with 30ml deionized water solution, stirred at high speed for 0.5 hours, and ultrasonically dispersed for 10-15 minutes;

[0053] 2. Preparation of sepiolite 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 polytetrafluoroethylene hydrophobizing agent is 20wt%, and then coat a layer of polytetrafluoroethylene on one side. A composite material layer composed of vinyl fluoride and conductive carbon black particles, wherein the content of polytetrafluoroethylene is 30wt%, which is ...

Embodiment 3

[0064] The preparation of a long-life fuel cell membrane electrode with a porous adsorption layer comprises the following steps:

[0065] 1. Preparation of silica gel slurry

[0066] Mix 4.0g of silica gel and 90ml of 5wt% Flemion polymer with 200ml of isopropanol solution, stir at high speed for 0.5 hours, and ultrasonically disperse for 15 minutes;

[0067] 2. Preparation of silica gel adsorption layer

[0068] Coat the silica gel slurry on both sides of NRE 212CS and dry it at 100°C for 20 hours. The average thickness of the dry coating is about 4 μm;

[0069] 3. Pretreatment of the gas diffusion layer

[0070] Same as embodiment 2;

[0071] 4. Preparation of gas diffusion layer electrodes

[0072] 1g of 40wt% Pt / C catalyst (produced by Johnson Matthey) was dispersed in 1ml of isopropanol solution, while adding 10ml of 5wt% The resin solution is fully dispersed under vacuum conditions to prepare a catalyst slurry, which is coated on one side of the pretreated gas diff...

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Abstract

The invention provides a membrane electrode of a long-life fuel cell with a porous adsorption layer and a preparation method thereof. The membrane electrode is characterized in that a porous siliceous adsorption layer is additionally arranged between a catalyst layer and a proton exchange membrane and is used for multi-layer adsorption (e.g. surface adsorption, shallow adsorption and deep absorption) or interception of metal particles or ions moving or diffusing into the membrane so as to block the metal particles or ions against movement towards the membrane side or into the membrane, thereby prolonging the service life of the membrane electrode of the fuel cell. The porous siliceous adsorption layer is prepared with a porous siliceous material paligorskite-sepiolite mineral fiber, zeolite molecular sieve, montmorillonite, diatomaceous earth or silica gel and Nafion proton exchange resin. The preparation method of the porous siliceous adsorption layer comprises the following steps: preparation of the slurry of the porous material, preparation of the porous adsorption layer, pretreatment of the gas diffusion layer, preparation of the electrode of the gas diffusion layer, preparation of the chip of the fuel cell and preparation of the membrane electrode.

Description

technical field [0001] The invention relates to a fuel cell membrane electrode and a preparation method thereof, in particular to a long-life fuel cell membrane electrode with a porous adsorption layer and a preparation method thereof. The membrane electrode has a long service life under the condition that the performance of the battery is not reduced. 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 s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M8/02H01M4/88H01M8/0202H01M8/1004H01M8/1069
CPCY02E60/50Y02P70/50
Inventor 木士春徐峰
Owner WUHAN UNIV OF TECH
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