A kind of composite catalytic layer electrode for phosphoric acid fuel cell and preparation method thereof

A phosphoric acid fuel cell and composite catalytic layer technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of ineffective use of catalysts, strong hydrophobicity of tetrafluoroethylene, and limited platinum utilization efficiency, and achieve increased power density , strong hydrophobicity, and the effect of improving utilization efficiency

Active Publication Date: 2020-08-07
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for phosphoric acid fuel cells, tetrafluoroethylene is highly hydrophobic, so that some catalysts cannot be effectively used, resulting in limited platinum utilization efficiency.

Method used

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  • A kind of composite catalytic layer electrode for phosphoric acid fuel cell and preparation method thereof
  • A kind of composite catalytic layer electrode for phosphoric acid fuel cell and preparation method thereof
  • A kind of composite catalytic layer electrode for phosphoric acid fuel cell and preparation method thereof

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preparation example Construction

[0034] A kind of preparation method that is used for the composite catalytic layer electrode of phosphoric acid fuel cell provided by the invention, specifically comprises the following steps:

[0035] Step 1: After the electrode carrier is properly hydrophobic treated, the first layer of the composite electrode is obtained;

[0036] Step 2: After mixing the platinum carbon catalyst and the fluorine-containing hydrophobic binder in a certain proportion, apply it on the first layer of the electrode to form the second layer of the composite electrode;

[0037] Step 3: After mixing the platinum carbon catalyst and the polyphenylimidazole binder in a certain proportion, apply it on the second layer of the composite electrode to form the third layer of the composite electrode;

[0038] Step 4: Sintering the above-mentioned electrodes at high temperature to obtain composite catalytic layer electrodes for phosphoric acid fuel cells;

[0039] According to the present invention, the e...

Embodiment 1

[0046] First take an area of ​​10cm 2 Porous carbon paper (3.33cm×3.33cm), washed with ethanol and water, and dried. The polytetrafluoroethylene material is an emulsion dispersion and shaken fully, and the carbon paper is soaked in the polytetrafluoroethylene emulsion for 1 hour, then taken out to dry, and then weighed. Repeat the above steps 3 times until the weight ratio of carbon paper to polytetrafluoroethylene reaches 100:20, and sinter at 300°C for 1 hour to obtain the first layer of substrate.

[0047] Take 5 mg of platinum-carbon catalyst (40% platinum loading) and mix it with 0.01 mL of polyvinylidene fluoride dispersion with a mass fraction of 5% by ultrasonic at room temperature, take 5 mL of dimethylformamide as a solvent, and mix by ultrasonic for 1 to 2 hours . Then add 1 mL of auxiliary agent in 20% ethanol aqueous solution, and continue to sonicate for 1 to 2 hours. The mass ratio of the platinum carbon catalyst to polyvinylidene fluoride solid solution is 1...

Embodiment 2

[0052] First take an area of ​​10cm 2 Porous carbon paper (3.33cm×3.33cm), washed with ethanol and water, and dried. The polytetrafluoroethylene material is an emulsion dispersion and shaken fully, and the carbon paper is soaked in the polytetrafluoroethylene emulsion for 2 hours, then taken out to dry, and then weighed. Repeat the above steps three times until the weight ratio of carbon paper to polytetrafluoroethylene reaches 50:20, and sinter at 300°C for 2 hours to obtain the first layer of substrate.

[0053] Take 1 mg of platinum-carbon catalyst (40% platinum loading) and mix it with 0.004 mL of polyvinylidene fluoride dispersion with a mass fraction of 5% by ultrasonic at room temperature, take 5 mL of dimethylformamide as a solvent, and mix by ultrasonic for 1 to 2 hours . Then add 1 mL of auxiliary agent in 20% ethanol aqueous solution, and continue to sonicate for 1 to 2 hours. The mass ratio of the platinum carbon catalyst to the polyvinylidene fluoride solid sol...

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Abstract

The invention relates to a composite catalytic layer electrode for a phosphoric acid fuel cell and a preparation method of the composite catalytic layer electrode, and solves the technical problem that the utilization efficiency of electrode platinum for an existing phosphoric acid fuel cell is limited. The composite catalytic layer electrode is of a three-layer electrode structure, and more gas diffusion three-phase interfaces are formed, so that a catalyst is effectively in contact with an electrolyte layer, and the utilization efficiency of the noble metal catalyst is improved. The preparation method comprises the steps of carrying out hydrophobic treatment on an electrode carrier to obtain a first composite electrode layer; mixing a platinum-carbon catalyst with a fluorine-containing hydrophobic adhesive, and coating the first composite electrode layer with a mixture to form a second composite electrode layer; mixing the platinum-carbon catalyst with a polyphenyl imidazole adhesive, and coating the second composite electrode layer with a mixture to form a third composite electrode layer; and carrying out sintering treatment on an electrode obtained in the third step at a high temperature to prepare the composite catalytic layer electrode. The composite catalytic layer electrode prepared with the method has higher catalyst utilization efficiency and is applied to the phosphoric acid fuel cell, and the peak power is 640mw / cm<2>.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a key component for a hydrogen-oxygen fuel cell, in particular to a composite catalytic layer electrode for a phosphoric acid fuel cell and a preparation method thereof. Background technique [0002] Phosphoric acid fuel cell is a kind of fuel cell technology, which is a medium temperature fuel cell with an operating temperature between 160°C and 200°C. This kind of fuel cell is characterized by good tolerance to impurities in fuel. Compared with proton exchange membrane fuel cells based on Nafion membranes, phosphoric acid fuel cells have lower requirements for fuel purity and stronger anti-poisoning ability. For example, the Chinese patent whose publication number is CN105009336 uses phosphoric acid fuel cells and hydrogen fuel containing anti-carbon monoxide, and the cells have higher anti-poisoning properties. [0003] The electrode is a key component of the fuel cell, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M4/92
CPCY02E60/50
Inventor 邢巍刘世伟李晨阳
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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