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A low-load direct methanol fuel cell membrane electrode and its preparation method

A methanol fuel cell, membrane electrode technology, applied in fuel cells, battery electrodes, circuits, etc., can solve problems affecting MEA performance and life, and achieve the effect of ensuring MEA performance, structural improvement, and reducing load

Active Publication Date: 2021-11-02
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

MEA costs are usually reduced by reducing the catalyst loading and using non-precious metal catalysts, but generally both of these solutions will affect the performance and life of the MEA

Method used

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  • A low-load direct methanol fuel cell membrane electrode and its preparation method
  • A low-load direct methanol fuel cell membrane electrode and its preparation method
  • A low-load direct methanol fuel cell membrane electrode and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Preparation of cathode CCM

[0048] ① Slurry preparation: Weigh 213mg of 60wt% Pt / C cathode catalyst, wet it with a small amount of deionized water, add 20g of water and ethanol 1:1 solvent, and finally add 1.065g of 5wt% Nafion emulsion, and stir it ultrasonically for 30 minutes. Can.

[0049] ②Membrane preparation: cut a Nafion212 membrane of 10cm×10cm, remove the thinner protective film on one side, weigh and record the weight before spraying. Then place the side with the protective film down on the spray mold and fix it with screws.

[0050] ③Preparation of CCM by spraying: Place the spraying mold on the surface of the hot table of the ultrasonic spraying equipment, and transfer the catalyst slurry obtained in step ① into the liquid inlet device. Feed rate is 2mL min when spraying -1 , the temperature of the hot stage is 70°C, the ultrasonic atomization power of the nozzle is 15W, the spray gas pressure is 0.7MPa, and the moving speed of the nozzle is 200mm s...

Embodiment 2

[0062] (1) Preparation of cathode CCM

[0063] ① Slurry preparation: Weigh 213mg of 60wt% Pt / C cathode catalyst, wet it with a small amount of deionized water, add 20g of water and ethanol 1:1 solvent, and finally add 1.065g of 5wt% Nafion emulsion, and stir it ultrasonically for 30 minutes. Can.

[0064] ② Membrane preparation: Cut a piece of Nafion115 membrane of 10cm×10cm, weigh and record the weight before spraying. Then place it side down on the spray mold and fix it with screws.

[0065] ③Preparation of CCM by spraying: Place the spraying mold on the surface of the hot table of the ultrasonic spraying equipment, and transfer the catalyst slurry obtained in step ① into the liquid inlet device. Feed rate is 2mL min when spraying -1 , the temperature of the hot stage is 70°C, the ultrasonic atomization power of the nozzle is 15W, the spray gas pressure is 0.7MPa, and the moving speed of the nozzle is 200mm s -1 , the spraying path is set according to the actual area siz...

Embodiment 3

[0076] (1) Preparation of cathode CCM: Weigh 320mg of 40wt% Pt / C cathode catalyst, wet it with a small amount of deionized water, add 90g of water and ethanol 1:1 solvent, finally add 1.6g of 5wt% Nafion emulsion, and ultrasonically stir 30 minutes will do. The prepared slurry was sprayed on the surface of the Nafion115 film with an effective spray area of ​​8cm×8cm, and the spraying method was the same as in Example 1.

[0077] (2) Preparation of anode CCM and GDE: Weigh 512mg of 75wt% PtRu / C catalyst and wet it with water first, then add 1.807g of 5wt% Nafion emulsion and ultrasonically stir for 30 minutes. Divide the slurry into two parts, one is 1 / 3 of the total slurry, the other is 2 / 3 of the total slurry, 1 / 3 of the slurry is sprayed on the other side of the cathode CCM to prepare the anode CCM, 2 / 3 of the slurry is sprayed with the anode Anode GDE is prepared on the surface of the diffusion layer. Spraying method is the same as embodiment 1.

[0078] (3) MEA preparat...

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Abstract

The invention proposes a low-load direct methanol fuel cell membrane electrode and its preparation method. Under the condition that the catalyst load is reduced, the influence of the anode polarization loss and methanol permeation on the cathode performance is reduced by optimizing the MEA structure, so as to ensure that the battery operates at a low temperature. The performance under load conditions meets the requirements of the working point. The structure-optimized MEA assembled a single cell and tested its performance and stability. The reduction of the load has no effect on the short-term performance and stability of the battery, and the battery does not show significant attenuation after thousands of hours of long-term operation.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a low-capacity direct methanol fuel cell membrane electrode and a preparation method thereof. Background technique [0002] Compared with traditional fossil energy, fuel cell has the advantages of high efficiency and zero pollution. It is the preferred alternative energy source for new energy vehicles and stationary power stations. It has attracted extensive attention from researchers from various countries, but high cost is the main reason restricting its development and wide application. As a key component of fuel cells, membrane electrodes directly determine the performance, life and cost of fuel cells. The cost of membrane electrodes in fuel cell systems accounts for more than 60% of the total cost. In order to realize the commercialization of fuel cells as soon as possible, it is necessary to reduce the cost of fuel cells, that is, the cost of membrane electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1004H01M4/92H01M4/88H01M4/86
CPCH01M4/8657H01M4/8828H01M4/926H01M8/1004Y02E60/50Y02P70/50
Inventor 王素力景粉宁孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI