Membrane electrode containing hydrophilic high polymer in anode catalytic layer and preparation method thereof

A technology of hydrophilic polymers and catalytic layers, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as increased internal resistance, increased internal resistance of batteries, and cumbersome preparation processes, so as to avoid flooding and improve performance. Good, moisturizing effect

Inactive Publication Date: 2012-05-02
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0012] Chinese patent application document ZL200910188222.X discloses "Fuel Cell Catalyst Coated Membrane Electrode with Self-humidification Function and Preparation Method", the catalyst coating on both sides of the mentioned proton exchange membrane has an inner and outer double-layer structure, and proton exchange The catalyst coating close to the membrane is the inner catalyst layer, and the content of self-humidifying agent and proton exchange resin in the catalytic layer is high; the catalyst coating close to the gas diffusion layer is the outer catalyst layer, and the self-humidifying agent in the outer catalyst layer The content of Pt and proton exchange resin is low, and the Pt loading capacity of the inner and outer catalyst layers is the same. This method is complicated to prepare, and the two-layer catalytic layer will increase the charge transfer resistance of the catalytic layer.
[0013] Chinese patent application document ZL200910041374.7 discloses "electrocatalyst for fuel cell membrane electrode and its preparation method and fuel cell membrane electrode", which is based on SiO 2 、TiO 2 The modified carbon powder was used as a carrier to prepare a self-humidifying catalyst, and the catalyst was used in the cathode to prepare a self-humidifying membrane electrode with excellent performance. Water-retaining substances are added to the film, but the preparation process of this method is cumbersome, and SiO 2 The introduction of such inorganic oxides will also bring about the disadvantage of increased internal resistance
[0014] Due to the defects of complex preparation process, increased battery internal resistance or risk of internal conduction, and easy loss of inorganic hydrophilic particles during battery operation, the current self-humidifying membrane electrodes cannot achieve ideal self-humidification. / No moisturizing effect

Method used

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  • Membrane electrode containing hydrophilic high polymer in anode catalytic layer and preparation method thereof
  • Membrane electrode containing hydrophilic high polymer in anode catalytic layer and preparation method thereof
  • Membrane electrode containing hydrophilic high polymer in anode catalytic layer and preparation method thereof

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Experimental program
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Embodiment 1

[0045] The first step is to take a 4cm×4cm Nafion212 proton exchange membrane, first place it in 5% hydrogen peroxide at 80°C for 1 hour, wash it with distilled water, and put it in 0.5moli -1 treated in a sulfuric acid solution at 80°C for 1 hour, and then washed with distilled water. Place the treated Nafion membrane on the fixed frame of the prepared membrane electrode and fix it, the size of the active area is 5cm 2 , to prevent the membrane from shrinking and deforming during the spraying of the catalyst slurry;

[0046] In the second step, 1 g of polyethylene glycol (PEG4000) was dissolved in 99 g of deionized water to obtain an aqueous solution of PEG with a concentration of 1% by mass;

[0047] In the third step, 6.2 mg of Pt / C catalyst (Hispec 4100, Johnson Matthey) and 50 mg of perfluorosulfonic acid polymer solution (5wt% Nafion, DuPont), 8.8 mg of the PEG4000 solution prepared in the second step and 0.3 g of isopropanol were mixed and dispersed into a catalyst sl...

Embodiment 2

[0054] The first step is to take a 4cm×4cm Nafion 212 proton exchange membrane, first place it in 5% hydrogen peroxide at 80°C for 2 hours, wash it with distilled water, and put it in 0.5moli -1 treated in a sulfuric acid solution at 80°C for 2 hours, and then washed with distilled water. Place the treated Nafion membrane on the fixed frame of the prepared membrane electrode and fix it, the size of the active area is 5cm 2 , to prevent the membrane from shrinking and deforming during the spraying of the catalyst slurry;

[0055] The second step takes 0.1g polyvinyl alcohol (PVA) and dissolves it in 99.9g deionized water to obtain an aqueous solution of PVA whose mass percentage concentration is 1‰;

[0056] In the third step, 3.1 mg of Pt / C catalyst (Hispec 4100, Johnson Matthey) and 15 mg of perfluorosulfonic acid polymer solution (5wt% Nafion, DuPont), 44.2mg of the PVA solution prepared in the second step above and 0.2g of isopropanol, after mixing, disperse into a cataly...

Embodiment 3

[0060] Except in the third step, 3.1 mg of Pt / C catalyst (Hispec 4100, Johnson Matthey) with a Pt content of 40%, 15 mg of perfluorosulfonic acid polymer solution ( 5wt%Nafion, DuPont), 135.3mg of PVA aqueous solution and 0.2g isopropanol with a mass percentage concentration of 1‰, the loading of Pt in the anode catalyst layer is 0.1mg.cm -1, The added amount of PVA is 3wt.%.

[0061] During the determination of water content, except that 3.1 mg of Pt / C catalyst (Hispec 4100, Johnson Matthey) with a Pt content of 40%, 25 mg of perfluorosulfonic acid polymer solution were weighed in a mass ratio of 10:4:0.4:500, (5wt%Nafion, DuPont), the mass percent concentration of 135.3mg is except that the PVA solution of 1‰ and 0.2g isopropanol, other steps are identical with example 1, and water content determination method, battery activation mode and battery performance test method are the same as Example 1 is exactly the same.

[0062] The water content of the anode catalytic layer i...

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Abstract

The invention provides a membrane electrode containing a hydrophilic high polymer in an anode catalytic layer and a preparation method thereof. The method comprises the steps of: preprocessing a proton exchange membrane, mixing a carbon supported platinum catalyst, a perfluorinated sulfonic acid polymer solution, an organic high polymer with hydrophilicity or hygroscopicity in water or a low-boilting-point solvent, ultrasonically processing to prepare catalyst slurry, and spraying the catalyst slurry onto one side of the proton exchange membraneby adopting an illumination coating technology to prepare an anode catalytic layer; and spraying slurry, which does not containing the organic high polymer, onto the other side of the proton exchange membrane to obtain a cathode catalytic layer, and laminating the proton exchange membrane coated with catalysts at two sides with a gas diffusion layer to prepare a self-humidifying electrode with the anode containing the hydrophilic high polymer. According to the invention, the self humidification of the membrane electrode can be realized by means of simple and practical preparation method at low cost, and a fuel cell assembled with the self-humidifying membrane can be used for simplifying a system, reducing the cost and increasing the power density of the system.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cells, in particular to a membrane electrode with a hydrophilic polymer in the anode catalyst layer and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has many advantages such as high power density, high energy conversion efficiency, low temperature start-up and environmental friendliness, and it is the most promising power source and portable power source for zero-emission and pollution-free electric vehicles. Research on PEMFC has become a hot topic in the fields of electrochemistry and green energy, and many developed countries are investing huge sums of money in the development of this technology. [0003] The current PEMFC uses proton exchange membrane as the solid electrolyte material. During the operation of PEMFC, the conductivity of PEM has a linear relationship with its water content, and the conductivity of the proton e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86
CPCY02E60/50
Inventor 廖世军梁华根郑丽萍
Owner SOUTH CHINA UNIV OF TECH
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