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Method for recycling membrane electrode of proton exchange membrane fuel cell

A technology of proton exchange membrane and fuel cell membrane, which is applied in the field of fuel cells, can solve problems such as cost reduction and disadvantages, and achieve the effect of cost reduction

Inactive Publication Date: 2017-06-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of the development trend of fuel cells, these two methods are not conducive to reducing costs, so recycling catalysts and membranes at the same time is an additional problem in the industrialization of fuel cells

Method used

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  • Method for recycling membrane electrode of proton exchange membrane fuel cell
  • Method for recycling membrane electrode of proton exchange membrane fuel cell
  • Method for recycling membrane electrode of proton exchange membrane fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] will be 50cm 2 The direct methanol fuel cell CCM( figure 1 The total amount of cathode and anode catalysts is 9 mg cm -2 ), placed in a 250mL beaker, and added an aqueous alcohol solution prepared with a ratio of isopropanol and water of 1:1, and the solution covered the CCM. Place the beaker in an ultrasonic wave for 30 minutes, take out the residual flakes and rinse them with an alcohol solution with a ratio of 1:1 between isopropanol and water, and then treat them in 6wt% hydrogen peroxide, 0.5mol / L sulfuric acid and deionized water at 80°C Each treatment was performed in 60 minutes to obtain a complete Nafion membrane ( figure 2 ). The electrical conductivity of the Nafion film obtained was 89mS / cm, the elongation at break was 388%, the tensile strength was 12.4MPa, and the Young's modulus was 132MPa. The black slurry in the beaker ( image 3 ) after ultrasonic dispersion for 30 minutes for the preparation of direct methanol fuel cell anode catalyst layer by s...

Embodiment 2

[0032] will be 50cm 2 The direct methanol fuel cell CCM (the total amount of cathode and anode catalysts is 9mg cm -2 ) to obtain CCM after removing the diffusion layer, place it in a 250mL beaker, add the alcohol aqueous solution prepared with isopropanol and water ratio of 1:2, and the solution covers the CCM. Place the beaker in an ultrasonic wave and vibrate ultrasonically for 30 minutes, take out the residual sheet and rinse it with an aqueous alcohol solution, and then treat it in 0.45mol / L sulfuric acid, 5wt% hydrogen peroxide and deionized water at 100°C for 60 minutes each. The electrical conductivity of the Nafion membrane was 84mS / cm, the elongation at break was 394%, the tensile strength was 13.2MPa, and the Young's modulus was 127MPa. The black slurry in the beaker was rotary evaporated at 80° C. at a speed of 30 rpm, and the solvent was removed to obtain 440 mg of the catalyst. The calculated recovery rate of the catalyst was 98%.

Embodiment 3

[0034] will be 25cm 2 The direct methanol fuel cell CCM (the total amount of cathode and anode catalysts is 9mg cm -2 ) was placed in a 250mL beaker, and the alcohol aqueous solution prepared with n-butanol and water ratio of 1:1 was added, and the solution was covered with CCM. Place the beaker in an ultrasonic wave and vibrate ultrasonically for 30 minutes, take out the residual flakes and rinse them with an aqueous alcohol solution, and then treat them in 0.5mol / L sulfuric acid, 5wt% hydrogen peroxide and deionized water at 90°C for 60 minutes each. The electrical conductivity of the Nafion membrane obtained by testing is 92mS / cm, the elongation at break is 406%, the tensile strength is 12.8MPa, and the Young's modulus is 135MPa. The black slurry in the beaker was separated at 6500 rpm for 30 minutes at a centrifuge speed of 6500 rpm, the clear liquid was dried and the remaining solid was dried in a vacuum, the catalyst was 213 mg, and the catalyst recovery rate was calcul...

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Abstract

The invention relates to a method for recycling a membrane electrode of a proton exchange membrane fuel cell. The membrane electrode comprises a cathode catalysis layer, an anode catalysis layer and a proton exchange membrane. The method comprises the following steps: putting a to-be-recycled membrane electrode into alcohol-water mixed liquid, and carrying out ultrasonic treatment or wet-process ball milling until the cathode catalysis layer and the anode catalysis layer are completely separated from the proton exchange membrane; taking out the processed membrane electrode, and cleaning, so as to obtain a recycled to-be-used electrolyte membrane; and carrying out solid-liquid separation on black slurry, and carrying out high-temperature processing on solid matters, so as to obtain a catalyst containing precious metals. Compared with the prior art, the method has the advantage that the cost of the proton exchange membrane fuel cell is lowered. The method has the outstanding characteristics that the catalysis layers and the membrane in an MEA of the proton exchange membrane fuel cell are separated by virtue of a mild method and are respectively recycled; and the recycled catalyst can be repeatedly used or can be further purified, so as to obtain the precious metals, and the recycled electrolyte membrane can be repeatedly used or can be further dissolved, so as to obtain an electrolyte membrane emulsion or a re-cast membrane.

Description

technical field [0001] The invention belongs to the technical field of fuel cells; specifically, it relates to a method for simultaneously recovering electrolyte membranes and noble metal catalysts in membrane electrodes of proton exchange membrane fuel cells. Background technique [0002] Proton exchange membrane fuel cells (PEMFC) mainly include hydrogen-oxygen fuel cells and direct methanol fuel cells, both of which have broad development potential and application prospects. The core components of these two types of fuel cells, the MEA, usually consist of a cathode and anode diffusion layer, an anode and cathode catalyst layer, and a proton exchange membrane. The main material of the diffusion layer is carbon paper or carbon cloth, the main material of the catalytic layer is a noble metal catalyst, and the proton exchange membrane is Nafion. In direct methanol fuel cell MEA, the cost of catalyst and membrane accounts for about 75% of the total cost of MEA. Although the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/008
CPCH01M8/008Y02W30/84
Inventor 孙公权景粉宁王素力夏章讯
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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