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A method for recovering proton exchange membrane fuel cell

A proton exchange membrane and fuel cell technology, applied in the field of resource recycling, can solve the problem that high-value materials cannot be effectively reused, and achieve the effects of avoiding fluoride and sulfide pollution, short process, and no pollutant discharge

Inactive Publication Date: 2018-12-25
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problem of fluoride and sulfide pollution generated in the current incineration process of proton exchange membrane fuel cells, and the problem that high-value materials (bipolar plates, proton exchange membranes, etc.) cannot be effectively reused, the invention provides a proton exchange The recovery method of membrane fuel cell is a green and environment-friendly method for recycling valuable materials and platinum in proton exchange membrane fuel cells. Solvent dissolution is used to recover proton exchange membrane, roasting-reduction-oxidation complexation-refining to prepare high-purity platinum ingots , not only eliminates the generation of pollutants such as fluoride, but also maximizes the recovery of valuable materials in the battery

Method used

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  • A method for recovering proton exchange membrane fuel cell

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Effect test

Embodiment 1

[0032] First, the proton exchange membrane fuel cell was disassembled to obtain bipolar plates and membrane electrodes, and the membrane electrodes were placed in an aqueous solution with a hydrogen peroxide concentration of 10.0% at 100°C for 30 minutes and washed repeatedly with deionized water for 3 times; then the washed membrane The electrode was reacted with 0.1mol / L sulfuric acid at 90°C for 30min, then washed twice with deionized water and dried. The dried membrane electrode was reacted with ethanol aqueous solution in a hydrothermal reaction kettle at 160° C. for 4 hours, and filtered to obtain Nafion solution and platinum carbon filter residue. Evaporate the Nafion solution to dryness to obtain Nafion resin, add dimethyl sulfoxide (DMSO) to dissolve it, perform vacuum defoaming, and cast a film to obtain a Nafion regeneration film. The platinum charcoal filter residue was roasted at 800°C to remove organic matter and carbon, then the roasted product was reduced with ...

Embodiment 2

[0034]First, the proton exchange membrane fuel cell was disassembled to obtain bipolar plates and membrane electrodes, and the membrane electrodes were placed in an aqueous solution with a hydrogen peroxide concentration of 9.0% at 95°C for 40 minutes, and washed twice with deionized water; then the washed membrane The electrode was reacted with 0.2mol / L sulfuric acid at 86°C for 35min, then washed three times with deionized water and dried. The dried membrane electrode was reacted with isopropanol aqueous solution in a hydrothermal reaction kettle at 165° C. for 3.8 hours, and filtered to obtain Nafion solution and platinum carbon filter residue. Evaporate the Nafion solution to dryness to obtain Nafion resin, add dimethyl sulfoxide (DMSO) to dissolve it, perform vacuum defoaming, and cast a film to obtain a Nafion regeneration film. The platinum charcoal filter residue was roasted at 800°C to remove organic matter and carbon, then the roasted product was reduced with hydrazi...

Embodiment 3

[0036] First, the proton exchange membrane fuel cell was disassembled to obtain bipolar plates and membrane electrodes, and the membrane electrodes were placed in an aqueous solution with a hydrogen peroxide concentration of 8.0% at 90°C for 50 minutes, and washed repeatedly with deionized water for 3 times; then the washed membrane The electrode was reacted with 0.4mol / L sulfuric acid at 84°C for 40min, then washed three times with deionized water and dried. The dried membrane electrode was reacted with isopropanol aqueous solution in a hydrothermal reaction kettle at 170° C. for 3.5 hours, and filtered to obtain Nafion solution and platinum carbon filter residue. Evaporate the Nafion solution to dryness to obtain Nafion resin, add dimethyl sulfoxide (DMSO) to dissolve it, perform vacuum defoaming, and cast a film to obtain a Nafion regeneration film. The platinum charcoal filter residue was roasted at 800°C to remove organic matter and carbon, then the roasted product was re...

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Abstract

The invention relates to a recovery method of a proton exchange membrane fuel cell, belonging to the field of resource recycling. The method comprises disassembly of a proton exchange membrane fuel cell, dissolution of a perfluorosulfonic acid (Nafion) membrane and regeneration of a cast membrane, oxidative complexation and purification of platinum, finally obtaining a bipolar plate, regeneratingthe Nafion membrane and the platinum ingot. The invention adopts organic solvent to dissolve and recover high-value Nafion membrane, avoids fluoride pollution caused by traditional direct incineration, and has remarkable economic benefit; Platinum ingots with purity over 99.99% are obtained by cationic resin adsorption and pyrometallurgical refining. The process is short and no pollutant is discharged, so it is suitable for industrial application.

Description

technical field [0001] The invention mainly belongs to the technical field of resource recycling, and in particular relates to a recovery method of a proton exchange membrane fuel cell. Background technique [0002] The proton exchange membrane fuel cell system is the core of the proton exchange membrane fuel cell vehicle, which consists of fuel cell stacks and auxiliary systems, and its cost accounts for about 63% of the vehicle cost. The cost of the electric stack in the fuel cell system reaches 2 / 3, and the cost of the fuel electric stack accounts for about 41% of the cost of the entire fuel cell vehicle. The fuel cell stack is the heart of the fuel cell system. A single fuel cell is mainly composed of a bipolar plate (the mechanism for hydrogen and oxygen supply) and a membrane electrode. The membrane electrode is mainly composed of a proton exchange membrane, a diffusion layer (carbon fiber membrane), and a platinum catalyst. composition. The working principle of prot...

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 张深根丁云集刘波
Owner UNIV OF SCI & TECH BEIJING
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