Method for preparing thin hydrophobisation layer

A catalytic layer and thin layer technology, which is applied in the field of proton exchange membrane fuel cells, can solve the problems of insufficient hydrophobicity and achieve the effect of improving complete hydrophilic properties, good three-phase interface, and improving performance

Active Publication Date: 2010-06-09
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

However, in this method, the water repellent (PTFE) has not been roasted at high temperature, and its water repellency cannot be fully exerted.

Method used

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  • Method for preparing thin hydrophobisation layer
  • Method for preparing thin hydrophobisation layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare a 5wt.% PTFE emulsion and use ultrasonic vibration to uniformly stand by, weigh 20 mg of 50 wt.% Pt / C catalyst with a primary balance, moisten it with distilled water, add 10ml of isopropanol, and disperse the catalyst completely by ultrasonic vibration, then Weigh 29.5mg of 5wt.% PTFE emulsion, and continue to vibrate ultrasonically for 2h. Take an aluminum foil with a smooth surface and an effective area of ​​5cm×5cm, and spray the prepared slurry directly on the aluminum foil. Then it was placed in a nitrogen-filled oven and fired at 240°C for 30 minutes, and then baked at 340°C for 30 minutes. Weigh 160mg of 5wt.% Nafion solution, dilute it with isopropanol, and spray it directly on the catalytic layer. Then the three-dimensional catalytic layer was kept at 150° C. for 2 minutes under 15 Kg·N, and then pressed onto the N212 membrane to form a CCM.

[0025] Test the contact angle of CCM obtained by this method, and compare it with the contact angle of compl...

Embodiment 2

[0027] The difference from Example 1 is that: 25mg of 40wt.% catalyst and 23mg of 5wt.% PTFE emulsion are selected to prepare catalyst slurry, and the Nafion solution sprayed subsequently is 240mg. The prepared CCM is assembled into a battery, and its performance is compared with that of a conventional hydrophilic CCM such as figure 2 shown. from figure 2 It can be seen that the performance of the CCM after adding PTFE has been significantly improved compared with that of the completely hydrophilic CCM, indicating that the CCM prepared by the invention improves the battery performance and avoids the water flooding of the catalytic layer.

Embodiment 3

[0029] The difference from Example 1 is that the temperature of the pressure turning process is 150° C., the pressure is increased to 20 Kg·N, and the holding time is 5 minutes.

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PUM

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Abstract

The invention relates to a method for preparing a thin hydrophobisation layer. The method comprises the following steps of: preparing an ink from a catalyst and a hydrophobic agent; spraying the ink on a heat-resisting medium with a smooth and flat surface to carry out high-temperature roasting to realize hydrophobisation; spraying a proton conductor polymer on the surface after carrying out roasting to realize three-dimensionality of an electrode; and then transferring the obtained product on a proton membrane to form a thin hydrophobic catalyst layer covered on the membrane. A membrane-covered catalyst layer prepared by the method can form excellent hydrophobic pore channels. Compared with the hydrophilic membrane-covered catalyst layer, the membrane-covered catalyst layer prepared by the method effectively avoids a flooding phenomenon in the high current density zone of a fuel cell, and has greatly improved performance.

Description

technical field [0001] The present invention relates to a proton exchange membrane fuel cell, in particular to a method for preparing an electrode assembly of a proton exchange membrane fuel cell-a hydrophobic film-coated thin-layer catalytic layer, which effectively improves the completeness of the traditional film-coated catalytic layer. The hydrophilic property avoids the flooding phenomenon of the battery in the high density area and improves the performance of the battery. Background technique [0002] Proton exchange membrane fuel cell is a power generation device that uses hydrogen as fuel and can effectively convert its chemical energy into electrical energy. Its high energy density, fast start-up speed, low operating temperature, and good environment determine the It is very suitable as a power source for electric vehicles, a portable small power supply, and a power supply for underwater power systems. Therefore, since the 1990s, it has been widely concerned by gov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 衣宝廉俞红梅宋微邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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