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Membrane electrode with efficient proton transport network and preparation method of membrane electrode

A transmission network and membrane electrode technology, applied in battery electrodes, circuits, fuel cells, etc., can solve the problems of serious accumulation of ion resin active centers, non-adjustable proton conduction efficiency, and influence on oxygen transmission, etc., to improve proton transfer Mass efficiency, improve oxygen mass transfer efficiency, and prevent excessive accumulation

Pending Publication Date: 2021-12-03
上海唐锋能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, the ion resin is randomly adsorbed on the surface of the catalyst disorderly, and the proton conduction efficiency is not adjustable; second, the ion resin accumulates seriously in some active centers, which affects the oxygen transmission

Method used

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  • Membrane electrode with efficient proton transport network and preparation method of membrane electrode
  • Membrane electrode with efficient proton transport network and preparation method of membrane electrode
  • Membrane electrode with efficient proton transport network and preparation method of membrane electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing a membrane electrode with an ordered proton transport channel, the method comprising the steps of:

[0032] S1, mixing carbon nanofibers with concentrated sulfuric acid and concentrated nitric acid (mass ratio is 1:3:3), reacting at 90°C for 48 hours to obtain sulfonated carbon nanofibers with proton transport ability modified by sulfonic acid groups;

[0033] S2. Add 0.1g of commercial ionic resin solution (20% by wt. perfluorosulfonic acid resin dispersion) and 0.1g of platinum-carbon catalyst (platinum loading 50%) to a mixed solvent of 15ml of isopropanol and water (vol. Ratio 3:1), and add 0.01g of sulfonated carbon nanofibers obtained in step S1, after the mixed slurry was stirred for 24h, the cathode catalyst layer slurry was obtained; wherein, the mass ratio of sulfonated carbon nanofibers to platinum-carbon catalyst is 0.1:1; in the obtained cathode catalyst layer slurry, the mass ratio of the ion resin to the platinum-carbon catalyst is ...

Embodiment 2

[0037] The method of this embodiment is the same as that of Example 1, except that in step S2, the mass ratio of sulfonated carbon nanofibers to the negatively charged platinum-carbon catalyst (the platinum loading of the catalyst is about 50%) is 0.2:1.

Embodiment 3

[0039] The method of this embodiment is the same as that of Example 1, except that in step S2, the mass ratio of sulfonated carbon nanofibers to the negatively charged platinum-carbon catalyst (the platinum loading of the catalyst is about 50%) is 0.4:1.

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Abstract

The invention discloses a membrane electrode with an efficient proton transport network. The membrane electrode comprises an anode catalyst layer, a proton exchange membrane and a cathode catalyst layer; sulfonated carbon nanofibers are arranged in the cathode catalyst layer, the mass ratio of the sulfonated carbon nanofibers to a platinum-carbon catalyst is (0.1-0.4): 1, and protons are transmitted in the sulfonated carbon nanofibers. The carbon nanofibers are subjected to sulfonyl modification, so that the carbon nanofibers have a proton conduction function; and the modified nanofibers have hydrophilicity and are easy to adsorb ion resin, so that the ion resin is distributed along the fibers, the orderliness of the ion resin is enhanced, and the proton mass transfer efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a membrane electrode with a high-efficiency proton transport network and a preparation method thereof. Background technique [0002] Membrane electrode composed of cathode, anode and proton exchange membrane is an important part of proton exchange membrane fuel cell. The cathode catalytic layer is composed of ion resin and catalyst. Hydrogen forms protons at the anode, transports to the cathode through the proton membrane, and transports to the platinum surface in the ion resin of the cathode for reaction. Therefore, improving the transport efficiency of protons in the cathode catalytic layer can reduce the amount of ion resin used, improve battery performance, and reduce production costs. At present, the preparation of the catalytic layer of the proton exchange membrane fuel cell usually uses the method of mechanically mixing the ion resin and the catalyst, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1004H01M4/88H01M4/90H01M4/92
CPCH01M8/1004H01M4/90H01M4/921H01M4/8828Y02E60/50
Inventor 朱凤鹃王超韩爱娣陈伟王立平
Owner 上海唐锋能源科技有限公司
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