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Self-supportable fuel cell catalyst layer with gradient distribution structure

A gradient distribution, fuel cell technology, applied to battery electrodes, structural parts, circuits, etc., can solve the problems of preparation methods to be optimized, thin thickness, catalytic layer structure needs to be further improved, etc., to facilitate industrial application, reduce consumption, maintain The effect of catalytic performance

Inactive Publication Date: 2018-02-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst obtained by this method has the characteristics of less precious metal consumption and thin thickness, which mainly solves the problems of drainage and catalyst utilization in the catalytic layer, but the structure of the catalytic layer needs to be further improved, and the preparation method needs to be optimized.

Method used

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  • Self-supportable fuel cell catalyst layer with gradient distribution structure
  • Self-supportable fuel cell catalyst layer with gradient distribution structure
  • Self-supportable fuel cell catalyst layer with gradient distribution structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] First, take 4.4 mg, 1.1 mg, and 1.0 mg of self-made carbon nanofibers, self-made carbon nanotubes, and self-made carbon black-supported platinum catalysts (the mass fraction of platinum is 20%), mix them with 50 mL of ethanol solution in a beaker, and ultrasonically 5 minutes to make it fully mixed, then pour the mixture into a solvent filter for suction filtration, the diameter of the filter element is 4cm, to obtain the first catalytic layer.

[0051] Then take the mass of self-made carbon nanofiber, self-made carbon nanotube and self-made carbon black supported platinum catalyst (platinum mass fraction is 20%) to be 2.2mg, 1.1mg, 1.8mg respectively, and repeat the process of the first layer to obtain The catalytic layer of the double-layer structure. Then weigh 80 mg of Nafion solution with a concentration of 5%, dilute it with 0.5 mL methanol, and pour it evenly into the solvent filter. Since the structure of the first layer is relatively loose and the structure of...

Embodiment 2

[0055] First, take 4.4 mg, 1.1 mg, and 1.9 mg of self-made carbon nanofibers, self-made carbon nanotubes, and self-made carbon black-supported platinum catalysts (the mass fraction of platinum is 20%), mix them with 50 mL of ethanol solution in a beaker, and use an ultrasonic machine to sonicate 5 minutes to make it fully mixed, then pour the mixture into a solvent filter for suction filtration, the diameter of the filter element is 4cm, to obtain the first catalytic layer.

[0056] Then take the mass of self-made carbon nanofiber, self-made carbon nanotube and self-made carbon black supported platinum catalyst (platinum mass fraction is 20%) is respectively 2.2mg, 1.1mg, 3.7mg, repeat the process of the first layer, obtain The catalytic layer of the double-layer structure. Then weigh 160 mg of Nafion solution with a concentration of 5%, dilute it with 1.0 mL of methanol, and pour it evenly into the solvent filter. Since the structure of the first layer is relatively loose an...

Embodiment 3

[0060] First, take 4.4 mg, 1.1 mg, and 2.9 mg of self-made carbon nanofibers, self-made carbon nanotubes, and self-made carbon black-supported platinum catalysts (the mass fraction of platinum is 20%), mix them with 50 mL of ethanol solution in a beaker, and use an ultrasonic machine to sonicate 5 minutes to make it fully mixed, then pour the mixture into a solvent filter for suction filtration, the diameter of the filter element is 4cm, to obtain the first catalytic layer.

[0061] Then take the mass of self-made carbon nanofiber, self-made carbon nanotube and self-made carbon black supported platinum catalyst (platinum mass fraction is 20%) is respectively 2.2mg, 1.1mg, 5.7mg, repeat the process of the first layer, obtain The catalytic layer of the double-layer structure. After that, 240 mg of Nafion solution with a concentration of 5% was weighed, diluted with 1.5 mL of methanol, and evenly poured into the solvent filter. Since the structure of the first layer is relativel...

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Abstract

The invention relates to a self-supportable fuel cell catalyst layer with a gradient distribution structure. The catalyst layer can realize the gradient distribution of a catalyst active center, a proton channel and a mass transfer channel. Compared with the prior art, the self-supportable fuel cell catalyst layer not only can provide more active centers and a bigger gas-liquid-solid three-phase reaction interface and has the characteristics of smooth proton channel and product / reactant mass transfer channel at the same time. By adopting the self-supportable fuel cell catalyst layer, the utilization rate and electrochemical cyclic stability of the catalyst active center can be improved, and the diffusion of a reaction raw material and a product can be promoted; moreover, the self-supportable fuel cell catalyst layer has the advantages of simple production process and easiness in mass preparation. The performance of the catalyst layer can be improved, and the production cost can be decreased. The catalyst layer obtained by the invention not only can be applied to the field of energy storage and conversion, such as proton exchange membrane fuel cells (PEMFC) and other power supply systems, but also can be applied to the fields such as electrochemical organic synthesis, electrochemical reaction engineering and chemical reaction engineering.

Description

technical field [0001] The invention relates to a fuel cell catalyst layer, in particular to a self-supporting fuel cell catalyst layer with a gradient distribution structure. Background technique [0002] Proton Exchange Membrane Fuel Cells (PEMFCs) can directly convert chemical energy into electrical energy. The catalytic layer is the core component of the proton exchange membrane fuel cell. It not only provides a catalytic active center for the electrochemical reaction of the fuel cell, but also provides electron channels, proton channels and mass transfer (reaction gas and product water) channels for the reaction. Its composition and structure not only directly determine the activity and output power of the fuel cell, but also greatly affect the stability, reliability and durability of the fuel cell, and account for a high cost share in the fuel cell system. [0003] Conventional catalytic layers are generally prepared by ink-forming methods such as Pt / C and other catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/92H01M4/88
CPCH01M4/88H01M4/9041H01M4/9083H01M4/92H01M4/921H01M4/926Y02E60/50
Inventor 郑俊生张存满黄军
Owner TONGJI UNIV
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