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Hydrogel-containing catalyst slurry, catalyst layer prepared from same and fuel cell electrode

A fuel cell electrode and catalyst slurry technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of not being able to meet the requirements of electrodes and difficult to meet high-temperature and low-humidity operating conditions, so as to improve water management problems, improve battery characteristics, The effect of guaranteed output performance

Active Publication Date: 2020-06-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst slurry uses a thickener on the basis of the conventional catalyst slurry system to increase the viscosity of the slurry. This method can only be used in conjunction with the coating process, and the slurry system is difficult to meet the high temperature and low humidity operating conditions and cannot adapt to the next generation of electrodes. requirements for use

Method used

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  • Hydrogel-containing catalyst slurry, catalyst layer prepared from same and fuel cell electrode
  • Hydrogel-containing catalyst slurry, catalyst layer prepared from same and fuel cell electrode
  • Hydrogel-containing catalyst slurry, catalyst layer prepared from same and fuel cell electrode

Examples

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Effect test

Embodiment 1

[0032] A fuel cell electrode is prepared through a catalyst slurry containing nano hydrogel, and the steps of the preparation method are as follows:

[0033] Weigh 80mg of Pt / C catalyst (Pt content is 50wt.%), use 3.2g of n-propanol solution as organic solvent, and use ultrasonic dispersion treatment for 30min; then add 100mg Nafion D2020 (20wt.%) and 16mg lignin successively Sodium sulfonate hydrogel (purchased from Shandong West Asia Chemical Industry Co., Ltd.), adopts mechanical stirring and ultrasonic wave to process simultaneously, and the rotating speed of mechanical stirring is 100 and 1500r / min, and the power of ultrasonic dispersion is 800W, and wherein first carries out ultrasonic treatment time for 0.5h, mechanical treatment for 1.5h, and then ultrasonic treatment for 0.5h, until it is fully and uniformly dispersed to obtain a catalyst slurry, wherein the solid content in the catalyst slurry is 3.4%, and this solid content refers to the Pt / C catalyst, Content of io...

Embodiment 2

[0037] A fuel cell electrode is prepared through a catalyst slurry containing nano hydrogel, and the steps of the preparation method are as follows:

[0038] Weigh 30mg of PtNi / C catalyst (Pt content is 50wt.%), use 0.3g of isopropanol solution as organic solvent, adopt ultrasonic dispersion treatment for 45min; then add 52.5mg SS700C (20wt.%) and 1.5mg sodium lignosulfonate hydrogel (purchased from Shandong West Asia Chemical Industry Co., Ltd.), adopt mechanical stirring and ultrasonic treatment simultaneously, the rotating speed of mechanical stirring is 500 and 3000r / min, the ultrasonic dispersion The power is 300W, and the processing time is 30min each. After it is fully and uniformly dispersed, a catalyst slurry is prepared, wherein the solid content in the catalyst slurry is 10.9%. The solid content refers to the Pt / C catalyst, ion conductor and nanohydraulic Glue content. Among them, the Pt loading amount of the Pt / C catalyst in this example, the mass ratio of the hy...

Embodiment 3

[0041] A fuel cell electrode is prepared through a catalyst slurry containing nano hydrogel, and the steps of the preparation method are as follows:

[0042] Weigh 146mg of PtCo / C catalyst (Pt content is 41wt.%), use 7.317g of isopropanol solution as organic solvent, use ultrasonic dispersion treatment for 45min; then add 1.036g Nafion D520 (5wt.%) and 22mg of acrylic acid Hydrogel-like (purchased from Shanghai Yuanye Biotechnology Co., Ltd.), using ultrasonic treatment, the power of ultrasonic dispersion is 500W, and the treatment time is 60min. After it is fully and uniformly dispersed, a catalyst slurry is obtained, wherein the catalyst slurry The solid content is 2.6%, which refers to the content of Pt / C catalyst, ion conductor and nano hydrogel. Among them, the Pt loading amount of the Pt / C catalyst in this example, the mass ratio of the hydrogel to the catalyst in the catalyst slurry, and the solid content in the catalyst slurry are all shown in Table 1.

[0043] Get tw...

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Abstract

The invention relates to hydrogel-containing catalyst slurry, a catalyst layer prepared from the same and a fuel cell electrode. The catalyst slurry comprises an organic solvent, as well as a catalyst, an ion conductor and hydrogel which are dissolved in the organic solvent, wherein the hydrogel is selected from lignosulfonate hydrogel or acrylic acid hydrogel. The catalyst layer can be obtained by coating the catalyst slurry. The preparation method of the fuel cell electrode includes the following steps that: (a) weighing a catalyst, an ion conductor and hydrogel, sequentially dissolving thecatalyst, the ion conductor and the hydrogel in an organic solvent, and performing uniform dispersing to obtain catalyst slurry; and (b) uniformly coating the catalyst slurry obtained in the step (a)on a gas diffusion layer or a proton exchange membrane, and then carrying out drying treatment to obtain the fuel cell electrode. Compared with the prior art, the fuel cell electrode can assist in solving a water management problem possibly occurring in high-temperature and low-humidity operation of a traditional fuel cell electrode and guaranteeing the output performance of a fuel cell.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a hydrogel-containing catalyst slurry, a prepared catalytic layer and a fuel cell electrode. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) is an energy conversion device that can directly convert chemical energy into electrical energy. It has significant advantages such as high energy conversion efficiency (40-60%), low operating temperature, fast start-up speed, and environmental friendliness. It is the main technical form adopted by domestic and foreign automotive fuel cells. [0003] Membrane Electrode (Membrane Electron Assembly, MEA) is the core component of the fuel cell. The conventional membrane electrode preparation method is to mix and disperse the catalyst and proton conductor (such as Nafion) in a certain proportion to form a catalyst slurry, and then prepare the catalyst slurry into a gas diffusion electrode (Gas Diffusion Electrode, GDE) by spra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/92
CPCH01M4/8663H01M4/926H01M4/921H01M4/8807H01M4/881H01M4/8828Y02E60/50
Inventor 姜永燚许思传
Owner TONGJI UNIV
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