Membrane electrode and preparation method thereof

A technology of membrane electrodes and anodes, applied in battery electrodes, circuits, fuel cells, etc., can solve problems such as uneven dispersion of catalyst particles, achieve the effects of improving electrochemical performance, uniform and stable slurry, and preventing agglomeration

Active Publication Date: 2019-02-26
SAIC MOTOR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst particles of PtCo / C catalyst are not uniformly dispersed on the carbon support, and there are agglomerated large particles, which makes the recombination of ion resin an unavoidable problem.

Method used

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  • Membrane electrode and preparation method thereof
  • Membrane electrode and preparation method thereof
  • Membrane electrode and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0065] The present invention does not specifically limit the preparation method of the above catalyst slurry, and it is preferable to complete the preparation by an ultrasonic dispersion method, and the ultrasonic time is preferably 25 minutes.

[0066] Then, the prepared slurry is coated on the proton membrane with an electrostatic sprayer to form a membrane electrode.

[0067] The present invention also provides a method for preparing the above-mentioned membrane electrode, which includes the following steps:

[0068] The catalyst slurry is sprayed onto the surface of the proton exchange membrane by electrostatic spraying process.

[0069] In the present invention, an electrostatic sprayer is preferably used for spraying, and the temperature of the vacuum chuck is preferably 90-100°C. This temperature can prevent the secondary agglomeration of the dispersed resin monomer. At the same time, while ensuring battery performance, try to reduce the preparation temperature.

[0070] The ab...

Embodiment 1

[0076] The platinum-carbon catalyst (0.303g) containing 46.5wt% platinum was dispersed in a mixed solvent of 6mL deionized water and 12mL ethanol by ultrasound to form a uniform suspension. At the same time, 0.22g cobalt nitrate hexahydrate and 0.396g tetrabromide Octylammonium was dissolved in 12 mL of ethanol solvent to form a cobalt nitrate solution, and then the cobalt nitrate solution was added dropwise to the platinum carbon suspension solution to form a mixed solution, the mixed solution was stirred, and the mixed solution was mixed while maintaining stirring To form a uniform solution, adjust the pH to about 4 to make the mixed solution acidic, and then pass an inert gas (such as nitrogen, helium or argon) into the mixed solution to remove oxygen for more than 1 hour.

[0077] Add 0.4 mL of hydrazine hydrate to the deoxygenated mixture. After stirring for 24 hours, wash the solids alternately with deionized water and ethanol, filter until the pH of the filtrate is neutral,...

Embodiment 2

[0082] 1. Preparation of catalyst slurry

[0083] Take a certain amount of the PtCo / C catalyst prepared in Example 1, and add the catalyst, deionized water, Nafion solution, ethanol, isopropanol and dioxane in sequence. The mass ratio of the above 6 components is 1:5:4:49 : 21:5. Among them, I / C = 0.75, and carbon mass fraction = 0.65%. After mixing, ultrasonic stirring was performed for 25 min.

[0084] 2. Electrostatic spraying

[0085] Set the temperature of the vacuum chuck to 95°C, and place the proton exchange membrane on the vacuum chuck. Add the prepared slurry to the feed tank, adjust the parameters of the electrostatic sprayer, and control the Pt loading of the cathode catalyst layer at 0.3mg Pt / cm 2 , The anode Pt load is 0.1mg Pt / cm 2 .

[0086] See the specific spraying process image 3 Shown.

[0087] Figure 4 SEM image (perpendicular to the direction of the proton membrane) of the catalytic layer formed after spraying. by Figure 4 It can be seen that the resin mo...

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Abstract

The invention provides a membrane electrode, comprising a proton exchange membrane, and a cathode catalytic layer and an anode catalytic layer laminated on both sides of the proton exchange membrane,wherein the cathode catalytic layer and the anode catalytic layer both comprise catalyst slurry; the catalyst slurry comprises a PtCo / C catalyst, an ionic resin solution and a dispersion solvent; andthe dispersion solvent comprises water, an alcohol compound and an alkane compound. According to the invention, directed at the PtCo / C catalyst, the ratio of the catalyst slurry is adjusted so as to allow the catalyst to achieve optimal dispersion effect, and the slurry is uniform and stable; at the same time, the agglomeration of ionic resin in a solvent is prevented, so the ionic resin can uniform cover the surface of the catalyst with uneven distribution of a hydrophilic phase, and thus, the electrochemical performance of a fuel cell is greatly improved.

Description

Technical field [0001] The invention relates to the technical field of fuel cells, in particular to a membrane electrode and a preparation method thereof. Background technique [0002] The proton exchange membrane fuel cell (PEMFC) uses hydrogen or purified reformed gas as fuel, air or pure oxygen as oxidant, and ion conductive polymer as electrolyte. It has low temperature operation, fast start-up, compact structure, and can operate in any orientation and angle. The advantages have attracted much attention in recent years. [0003] Among them, the membrane electrode assembly (MEA) is the core component of the proton exchange membrane fuel cell, including proton exchange membranes and electrodes. Proton exchange membrane not only plays a role of separating fuel gas and oxidant, but also plays a role of transferring protons. It is a high polymer membrane with selective permeability. Electrodes are usually divided into two layers: one layer is a catalyst layer as an electrochemical...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/92
CPCH01M4/88H01M4/921H01M4/926H01M8/1004Y02E60/50
Inventor 周红茹沈水云章俊良陈雪松方亮王晋王超程晓静
Owner SAIC MOTOR
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