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Membrane electrode with gradient structure catalyst layer for fuel cell and preparation method

A fuel cell and gradient structure technology, which is applied to battery electrodes, structural parts, circuits, etc., can solve the problems of high processing cost of the flow field structure, unfavorable mass production and low cost of products, and high requirements for raw materials of the flow field, so as to achieve the goal of lifting the membrane Electrode performance, improving coating efficiency, improving the effect of mass transfer polarization

Pending Publication Date: 2022-07-29
江苏昊氢世纪新能源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the design of the flow field structure makes the flow field present a special complex structural shape. The complex flow field structure has high processing costs and high requirements for flow field raw materials, which is not conducive to mass production and low cost of products.

Method used

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  • Membrane electrode with gradient structure catalyst layer for fuel cell and preparation method
  • Membrane electrode with gradient structure catalyst layer for fuel cell and preparation method
  • Membrane electrode with gradient structure catalyst layer for fuel cell and preparation method

Examples

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Effect test

Embodiment 1

[0034] A membrane electrode structure for a fuel cell with a gradient structured catalytic layer is described.

[0035] refer to Figure 1-Figure 3 , a membrane electrode for a fuel cell with a gradient structure catalytic layer, comprising a proton exchange membrane and a cathode and an anode catalytic layer located on both sides of the proton exchange membrane. When assembled into a fuel cell, the length direction of the membrane electrode for the fuel cell is The flow directions of hydrogen and air, and the thicknesses of the cathode and anode catalyst layers are periodically changed along the length direction of the membrane electrode for fuel cells.

[0036] The periodic change is a sine wave change; the crest thickness h1 of the sine wave is 20-30 μm, the trough thickness h2 of the sine wave is 10-18 μm, and the distance 1 between the crest and the trough is 3-19 cm.

[0037] The membrane electrode structure for a fuel cell further includes a gas diffusion layer located...

Embodiment 2

[0039] Weigh 200 mg of platinum-carbon catalyst (platinum loading 50%, brand TKK, model TEC10E40E) in a 50 mL beaker A, add 10 g of deionized water to completely wet the catalyst, and weigh 5% nafion solution (perfluorosulfonic acid) with a mass concentration. Type polymer solution, brand DuPont, model d520) 400mg and n-propanol 70g in beaker B, disperse beaker B uniformly by constant temperature ultrasonic 5min in a constant temperature ultrasonicator, then transfer the solution in beaker B into beaker A, and then use 7g Wash the beaker B with deionized water, transfer the washed deionized water into the beaker A, and adjust the solid content of the solution to 0.05%. Finally, the beaker A was sonicated for 30 minutes at a constant temperature in a constant temperature ultrasonicator, and then sheared with IKA T25 equipment at a high speed of 5000 rpm and a nitrogen atmosphere for 40 minutes, and then vacuum sheared for 5 minutes to obtain a uniformly mixed cathode and anode c...

Embodiment 3

[0043] Weigh 1g of platinum-carbon catalyst (50% platinum load, brand TKK, model TEC10E60TPM) and put it in a 50mL beaker A, add 10g of deionized water to completely wet the catalyst, and weigh 5% nafion solution (brand DuPont, model d520) 20g and n-propanol 6g in beaker B, disperse beaker B evenly by constant temperature ultrasonic 5min in a thermostatic ultrasonicator, then transfer the solution in beaker B into beaker A, then wash beaker B with 30g deionized water, The deionized water was transferred into beaker A, and the solid content of the solution was adjusted to 5%. Finally, the beaker A was sonicated for 30 minutes at a constant temperature in a constant temperature ultrasonicator, and then sheared with IKA T25 equipment at a high speed of 15,000 rpm and a nitrogen atmosphere for 40 minutes, and then vacuum sheared for 5 minutes to obtain a uniformly mixed cathode and anode catalyst layer slurry.

[0044] Then, the uniformly dispersed cathode and anode catalyst layer...

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Abstract

The invention discloses a fuel cell membrane electrode with a gradient structure catalyst layer and a preparation method, and relates to the field of fuel cells. The membrane electrode for the fuel cell comprises a proton exchange membrane, a cathode catalyst layer and an anode catalyst layer, the cathode catalyst layer and the anode catalyst layer are located on the two sides of the proton exchange membrane, and when the fuel cell is assembled, the length direction of the membrane electrode for the fuel cell is the flowing direction of hydrogen and air; and the thicknesses of the cathode catalyst layer and the anode catalyst layer are periodically changed along the length direction of the membrane electrode for the fuel cell. According to the membrane electrode disclosed by the invention, hydrogen consumption and oxygen are in effective gradient distribution under high current density, so that a regular air pressure difference is presented in a flow channel, better drainage capacity is achieved under a high-current-density and high-humidity environment, and mass transfer polarization is improved; in the aspect of mass transfer polarization, gradient design is carried out on a catalyst layer, and the design requirement for a bipolar plate flow channel is lowered. According to the preparation method, the spraying scheme is simplified, the coating efficiency is improved, and the process is simple and suitable for batch coating production.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a membrane electrode for fuel cells with a gradient structure catalytic layer and a preparation method. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is an efficient energy conversion device, which can directly convert chemical energy stored in hydrogen fuel and oxidant into electrical energy through electrochemical reaction. The characteristics of starting and high smooth operation are considered as an ideal power source to replace the internal combustion engine. [0003] However, the current industrialization process of PEMFC still faces problems such as high cost and short life. There are two main ways to improve the performance of PEMFC and reduce the system cost: one is from the perspective of the intrinsic activity of the catalyst, by changing the carrier, preparing alloy catalysts, etc. to reduce the amount of precious metal Pt used, and improve the ac...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/86H01M4/88Y02E60/50
Inventor 沈新龙赵海敏曹寅亮李伯球方蕾孙基文张树国
Owner 江苏昊氢世纪新能源有限公司
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