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Recovery method for fuel cell membrane electrode key material

A fuel cell membrane and key material technology, which is applied in the disposal/recycling of fuel cells, fuel cells, circuits, etc., and can solve problems such as higher operating conditions

Inactive Publication Date: 2009-06-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process requires high operating conditions, and further separation of Pt and carbon is required.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The recovery of the key materials of traditional membrane electrode MEA of proton exchange membrane fuel cell, its steps are:

[0032] 1. Take 5 grams of used MEA. The proton exchange membrane of MEA is Nafion series membrane NRE211 produced by DuPont. The catalyst used is Pt / C catalyst. The proton exchange resin is Nafion resin produced by DuPont. 0.5 mol / L dilute sulfuric acid, take it out after 2 hours and wash it with deionized water to remove impurities;

[0033] 2. Dry the cleaned MEA at 80°C under vacuum protection and shred it. After shredding, the area of ​​a single piece of MEA is less than 1 square centimeter;

[0034] 3. Put the shredded MEA into a three-necked flask, add 100 ml of concentrated sulfuric acid, heat and stir, and treat for 72 hours at a heating temperature of 180°C;

[0035] 4. Stop heating, add 1500 ml of 1 mol / L NaOH to adjust the pH to 6-8, obtain a transparent solution with black precipitate, pour out the transparent solution of black pre...

Embodiment 2

[0038] The recovery of the key material of CCM of proton exchange membrane fuel cell, its steps are:

[0039] 1. Take 1 gram of aged CCM. The proton exchange membrane of CCM is Nafion1135 perfluorinated proton exchange membrane. Soak in sulfuric acid for 2 hours, take out and wash with deionized water to remove impurities;

[0040] 2. Dry the cleaned CCM at 80°C under vacuum protection and shred it. After shredding, the area of ​​a single piece of CCM is less than 0.5 square centimeters;

[0041] 3. Put the shredded CCM into a three-necked flask, add 50ml of concentrated nitric acid, heat and stir for 90 hours, and the heating temperature is 200°C;

[0042] 4. Stop heating, add 500 ml of 1 mol / L NaOH, adjust the pH to 6-8 to obtain a transparent solution with black precipitate, then pour out the transparent solution of black precipitate in the three-necked flask to obtain Pt and dissolved Co A mixture of proton exchange resin solutions;

[0043] 5. Put the mixture of Pt and...

Embodiment 3

[0046] The recovery of the key material of CCM of proton exchange membrane fuel cell, its steps are:

[0047] 1. Get 2 grams of CCM waste, the proton exchange membrane is a BAM3G partially fluorinated proton exchange membrane, the catalyst is an unsupported Pt catalyst, and the proton exchange resin is a BAM3G partially fluorinated proton exchange resin. Soak for 2 hours, take out and wash with deionized water to remove impurities;

[0048] 2. Dry the cleaned CCM at 70°C under vacuum protection and shred it. After shredding, the area of ​​a single piece of CCM is less than 2 square centimeters;

[0049] 3. Put it into a three-necked flask, add 100 ml of mixed acid of concentrated sulfuric acid and concentrated nitric acid, the ratio of concentrated sulfuric acid and concentrated nitric acid is 1:1, heat and stir for 65 hours, and the heating temperature is 220°C;

[0050] 4. Stop heating, add 1300 ml of 1 mol / liter NaOH, adjust the pH to 6-8, obtain a transparent solution wit...

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Abstract

The invention provides a recovery method of key materials of membrane electrode assembly for fuel cells. The recovery method adopts concentrated sulfuric acid, concentrated nitric acid, or mixed acid of the concentrated sulfuric acid and the concentrated nitric acid in any proportion to treat waste membrane electrode assemblies, and is characterized in that acting force between proton exchange resin molecular chains in proton exchange membranes and catalyst layers is reduced by acid treatment, thereby separating the proton exchange resin molecular chains to scatter in acid to form a solution, catalyst noble metals can be sufficiently isolated by carbon carriers of oxidization supported catalysts, and additionally, gas diffusion layer materials (carbon paper or carbon fabric) can be isolated. The recovery method includes steps of (1) after cleaning, drying and shredding, immersing used membrane electrode assembly in the acid for further stirring and heating, (2) using NaOH solution to neutralize excess acid after reaction, and (3) isolating proton exchange resin solution, noble metal catalyst or gas diffusion layer materials. The recovery method has the advantages of simple operation, high recovery rate, low cost and the like.

Description

technical field [0001] The invention relates to a recovery method for proton exchange membrane fuel cell materials, in particular to a recovery method for platinum-based noble metal catalysts, proton exchange membranes and gas diffusion layer materials in membrane electrodes. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is an energy conversion device that directly converts chemical energy stored in fuel into electrical energy. It is environmentally friendly, high energy conversion efficiency, long life, and fast startup at room temperature. It has become one of the research hotspots in the field of new energy. [0003] At present, the high cost of PEMFC restricts its further development. The core device of PEMFC is usually a membrane electrode (Membrane electrode assembly, MEA), and its key materials are mainly platinum-based noble metal catalysts, proton exchange membranes and gas diffusion layer materials. Among them, Pt in platinum-based prec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/00H01M8/008
CPCY02E60/50
Inventor 木士春徐峰潘牧
Owner WUHAN UNIV OF TECH
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