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Preparation method of catalyst slurry for membrane electrode of fuel cell

An electrode catalyst, fuel cell membrane technology, applied in fuel cells, battery electrodes, electrochemical generators, etc., can solve problems such as affecting the electrochemical performance of catalysts, catalyst agglomeration and sedimentation, affecting catalyst slurry dispersibility and spraying effect, etc. , to achieve the effect of improving the dispersion of the solution, improving the electrochemical performance, and being convenient and easy to operate.

Inactive Publication Date: 2017-05-10
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the preparation process of traditional membrane electrode catalyst slurry, catalyst agglomeration and sedimentation are prone to occur, which will affect the dispersion and spraying effect of the catalyst slurry, and then affect the electrochemical performance of the catalyst.

Method used

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  • Preparation method of catalyst slurry for membrane electrode of fuel cell
  • Preparation method of catalyst slurry for membrane electrode of fuel cell
  • Preparation method of catalyst slurry for membrane electrode of fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Weigh 0.34g of 50wt.% Pt / C solid catalyst, slowly add water 1.7mL to it, make the catalyst particles fully wet, then add 5wt% Nafion solution 2.22mL, 60wt% Teflon dispersion 1.02 g. 35.47 mL of isopropanol and 0.91 mL of ethylene glycol;

[0036] (2) Stir with a magnetic stirrer for 10 minutes at a speed of 600rpm, then continue to stir with a shear emulsifier for 20 minutes at a speed of 10000rpm, and finally vibrate the obtained dispersion for 20 minutes with an ultrasonic power of 750W to make it mix uniform. That is, a catalyst slurry of the present invention is obtained.

Embodiment 2

[0038] (1) Weigh 0.61g of 50wt.% Pt / C solid catalyst, slowly add water 0.35mL to it, make the catalyst particles fully wet, then add 5wt% Nafion solution 3.82mL, 60wt% Teflon dispersion 0.79 g. 14.51 mL of isopropanol and 0.79 mL of ethylene glycol;

[0039] (2) Stir with a magnetic stirrer for 10 minutes at a speed of 600 rpm, then continue stirring with a shear emulsifier for 30 minutes at a speed of 10,000 rpm, and finally vibrate the obtained dispersion for 20 minutes with an ultrasonic power of 750W to make it mix uniform. That is, a catalyst slurry of the present invention is obtained.

Embodiment 3

[0041] (1) Weigh 0.47g of 50wt.% Pt / C solid catalyst, slowly add water 0.94mL to it, make the catalyst particles fully wet, then add 5wt% Nafion solution 2.89mL, 60wt% Teflon dispersion 0.31 g. 29.04 mL of isopropanol and 3.64 mL of ethylene glycol;

[0042] (2) Stir with a magnetic stirrer for 10 minutes at a speed of 600rpm, then continue to stir with a shear emulsifier for 10 minutes at a speed of 10000rpm, and finally vibrate the obtained dispersion for 20 minutes with an ultrasonic power of 750W to make it mix uniform. That is, a catalyst slurry of the present invention is obtained.

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Abstract

The invention relates to a preparation method of catalyst slurry for a membrane electrode of a fuel cell. The method comprises the following steps of (1) sequentially adding catalyst particles, water, a high polymer proton conductor solution, a Teflon solution, alcohol and a thickener for mixing; and (2) firstly stirring a mixture by using a magnetic stirrer, further stirring the mixture by using a shearing emulsifier or a homogenizer, finally carrying out oscillation by using an ultrasonic wave and obtaining the catalyst slurry. According to the preparation method, agglomeration of catalyst particles is effectively reduced and the dispersing performance of a catalyst is improved through controlling the material composition and the charging sequence and adjusting the stirring and dispersing mode. The electrochemical properties of the membrane electrode prepared by using the catalyst slurry are significantly improved; and furthermore, the process steps are simple, the operation is convenient and feasible, the raw materials are cheap and available, the energy consumption is low and the threshold is low.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a method for preparing fuel cell membrane electrode catalyst slurry. Background technique [0002] A fuel cell is a continuous power generation device that converts chemical energy in fuel and oxidant into electrical energy through electrochemical reactions. Compared with the existing fuel-based engines (gasoline and diesel engines), fuel cells have the characteristics of environmental friendliness, high energy efficiency, and wide power range. They are widely used in various fields such as vehicle generators, fixed power stations, and mobile power supplies. Therefore, it is widely valued by various countries and regions in the world. [0003] Fuel cell technology is mainly divided into several types according to different electrolytes: alkaline fuel cells, phosphoric acid fuel cells, molten carbonate fuel cells, proton exchange membrane fuel cells (also known as polymer elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/88H01M8/1004
CPCH01M4/88H01M4/926H01M8/1004Y02E60/50
Inventor 王诚郑云郭桂华雷一杰王建晨
Owner TSINGHUA UNIV
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