Anode catalyst layer slurry and preparation method thereof

A catalytic layer and anode technology, applied to battery electrodes, structural parts, electrical components, etc., can solve unsolvable problems, achieve low battery internal resistance, prevent water accumulation, and improve mass transfer capacity

Active Publication Date: 2021-12-03
国家电投集团氢能科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is mainly designed for anode water retention, and the hydrophilic catalyst and short-chain low-EW resin used cannot solve the problem of anode diffusion caused by anode flooding under the conditions of high temperature, low humidity, and low excess coefficient in the vehicle.

Method used

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  • Anode catalyst layer slurry and preparation method thereof
  • Anode catalyst layer slurry and preparation method thereof
  • Anode catalyst layer slurry and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0032] The present invention also provides a method for preparing an anode catalyst layer slurry comprising:

[0033]a, perfluorosulfonic acid resin was added to the solution and diluted with a solvent, the concentration preferably perfluorosulfonic acid resin solution is 20 to 40%, stirring speed is preferably 100-400r / min, stirring time of 30-60 min, perfluorosulfonic acid resin solids content of the diluted solution obtained is 2-20wt%;

[0034] b, / C catalyst was added to the Pt water, mixing, dilution perfluorosulfonic acid resin obtained in step a was then added and an emulsion of polytetrafluoroethylene, a ball mill, the speed is preferably 100-500r / min, the milling time is 1 4h, to obtain a catalyst slurry.

[0035] The method for preparing the anode catalyst layer slurry to an embodiment of the present invention, addition of a perfluorosulfonic acid resin EW of 650-750g / mol, since the resin is capable of providing more sulfonate, so that the present invention is pr...

Embodiment 1

[0041] First, the anode catalyst layer slurry was prepared

[0042] (1) resin dilution preparation: Weigh 2g perfluorosulfonic acid resin solution (resin content is 25wt%), EW perfluorosulfonic acid resin is from 680g / mol, and then diluted with ethanol added, the solid content of the resin solution was diluted 10wt%, stirred with a magnetic stirrer 30min, the rotational speed of 300rpm, until the resin solution is clear and transparent without bubbles;

[0043] After weighing Pt / C (Pt content of 50% by mass) 1g of catalyst into a ball mill jar, deionized water was added dropwise 5g catalyst sufficiently wetted, mixed on an analytical balance: (2) anode catalyst layer slurry was prepared , were added in step (1) obtained in the perfluorosulfonic acid resin solution was diluted PTFE dispersion and 1.25g (60% PTFE), to control the quality of the carbon support resin and catalyst ratio I / C = 1.0, ethanol was added and finally, control catalyst layer slurry solids content of 8wt%...

Embodiment 2

[0050] The same manner as Example 1, except that the anode catalyst layer slurry prepared in step (2), the resin and catalyst mass ratio of carbon support I / C = 0.9.

[0051] Performance Test Example 2 to obtain the membrane electrode embodiment of results are Figure 1-3 .

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Abstract

The invention discloses anode catalyst layer slurry which comprises perfluorosulfonic acid resin, polytetrafluoroethylene, a Pt/C catalyst, a solvent and water, wherein the perfluorosulfonic acid resin is short-chain resin with an EW value of 650-750 g/mol, the mass content of polytetrafluoroethylene in the anode catalyst layer slurry is 1-5%, a mass ratio I/C of the perfluorosulfonic acid resin to a carbon carrier in the Pt/C catalyst is 0.7-1.0, the solid content of the anode catalyst layer slurry is 2-15%, the solvent is selected from at least one of ethanol, normal propyl alcohol or isopropanol, and the mass content of Pt in the Pt/C catalyst is 30-60%. The anode catalyst layer slurry provided by the embodiment of the invention is used for preparing a membrane electrode and is suitable for working conditions of vehicle fuel cells; and under the conditions of high temperature, low humidity, low excess coefficient and an anode pulse drainage device, the diffusion of the catalyst layer can be remarkably improved, and relatively low internal resistance of the battery is ensured while effective water retention is realized.

Description

Technical field [0001] The present invention belongs to the field of fuel cell technology, particularly relates to an anode catalyst layer slurry, in particular, further relates to a method suitable for the preparation of the anode catalyst layer slurry. Background technique [0002] Because of its clean and efficient fuel cell is characterized in recent years by domestic and foreign government and to promote sustained attention. Performance of the membrane is limited primarily by three electrode polarization, to fuel cell vehicles, for example, we want to have excellent properties in high temperature operating conditions of the membrane electrode, a low coefficient of humidification and a low excess, can be effective in retaining water, has a more low internal resistance, and pulse discharge in the anode means, can be effective for water vapor transmission; but generally this condition, the mass transfer of large membrane electrode polarization loss, which seriously affects the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/926H01M4/8828H01M2004/8684Y02E60/50
Inventor 张爱京张宇柴茂荣周明正王顺忠王志昌
Owner 国家电投集团氢能科技发展有限公司
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