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Antipole membrane electrode for fuel cell and preparation method of antipole membrane electrode

A fuel cell and membrane electrode technology, applied in the field of electrochemistry, can solve the problem of uneven distribution of anti-counteractive active substances, and achieve the effect of improving uniformity and achieving uniform distribution

Active Publication Date: 2020-09-22
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an anti-anti-electrode membrane electrode for fuel cells and a preparation method thereof. The membrane electrode obtained by using the preparation method proposed by the invention overcomes the problem of uneven distribution of anti-anti-electrode active substances in the catalytic layer in the traditional method Disadvantage, the active substance can be distributed uniformly in the catalyst ink for a long time, so it can ensure the uniformity in the catalytic layer

Method used

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  • Antipole membrane electrode for fuel cell and preparation method of antipole membrane electrode
  • Antipole membrane electrode for fuel cell and preparation method of antipole membrane electrode
  • Antipole membrane electrode for fuel cell and preparation method of antipole membrane electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A preparation method for an anti-counterpolar membrane electrode for a fuel cell, comprising the steps of:

[0034] (1) Take 0.01mol of ammonium chloroiridate particles and add 0.02mol of lithium carbonate powder, mix evenly, place in the air atmosphere in the muffle furnace, and sinter at 750°C for 3 hours, take 0.1g of the powder obtained after sintering, and add 1mL of it in turn Pure water, 3mL ethanol and 40 μ L of Nafion emulsion with a mass fraction of 5% were uniformly dispersed and coated on the surface of the graphite sheet, and the modified electrode (graphite sheet coated with iridium active material) was inserted into a sulfuric acid solution with a concentration of 0.5M. The counter electrode is a platinum sheet, and a -1V potential is applied to polarize for 0.5h at room temperature to obtain the treated sulfuric acid solution;

[0035] (2) Subsequently, the treated sulfuric acid solution was centrifuged at a speed of 10000r / min for 0.5h to obtain an irid...

Embodiment 2

[0043] Same as Example 1, the difference is:

[0044] Step (1) The molar ratio of ammonium chloroiridate to lithium carbonate is 1:1, the sintering conditions are sintering temperature 1000°C for 15 hours, the cathode polarization potential is -0.5V for 1h, and then the iridium active material concentration is 50mg / mL; In the step (3), the content of the iridium active material in the membrane electrode is 15%.

[0045] All the other steps and test method are completely consistent with Example 1. The anti-reversal test shows that the unit power of the battery of the membrane electrode obtained in this embodiment only drops by 13mW after the electrode is reversed.

Embodiment 3

[0047] Same as Example 1, the difference is:

[0048] Step (1) The molar ratio of ammonium chloroiridate to lithium carbonate is 1:3, the sintering conditions are sintering temperature 900°C for 12h, the sulfuric acid electrolyte concentration is 0.1M, and the cathode polarization potential is 0V for 2h, step (2) Adopt the mixed solution of ethanol and water in, wherein the volume ratio of water and ethanol is 1:1, the suspension concentration of preparation iridium is 1mg / mL; In the step (3), the mass fraction of iridium active material in membrane electrode is 1% .

[0049] All the other steps and test method are completely consistent with Example 1. The anti-reversal test showed that the unit power of the battery of the membrane electrode obtained in this example decreased by 77mW after the electrode was reversed, and the performance of the electrode was still better than that of Comparative Example 1.

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Abstract

The invention discloses an anti-reverse membrane electrode for a fuel cell and a preparation method of the anti-reverse membrane electrode. The anti-antipole membrane electrode is prepared by mixing and coating turbid liquid of an anti-antipole active substance and catalyst ink and then drying, the turbid liquid of the anti-antipole active substance consists of the anti-antipole active substance and a solvent, wherein the pH value of the turbid liquid of the anti-antipole active substance is 6-7, the anti-antipole active substance is a nano-material catalyst containing an iridium or rutheniumsimple substance, an iridium or ruthenium simple substance oxide or an iridium or ruthenium simple substance hydroxide, and the mass fraction of the anti-antipole active substance in the anti-antipolemembrane electrode is 1%-15%. According to the invention, the anti-antipole capability of the membrane electrode is ensured, the addition amount of noble metal active substances can be further reduced, the cost is reduced, the anti-antipole active substances can be added together with other additives in the membrane electrode in the preparation process, the coating process is not additionally added, and the preparation method is suitable for preparing the large-area membrane electrode.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to an anti-reverse electrode membrane electrode for fuel cells and a preparation method thereof. Background technique [0002] In the actual working process of the fuel cell stack, the reverse polarity phenomenon will occur due to the obstruction of gas transmission. However, long-term reverse polarity will lead to irreversible attenuation of membrane electrode performance and affect the energy output of the stack. In order to ensure the stable operation of membrane electrodes, improving the stability of membrane electrode materials under high oxidation potential is an effective way to improve the ability of membrane electrodes to resist reverse polarity. [0003] At present, in the research of anti-reversal membrane electrodes, researchers generally add an appropriate amount of anti-reversal active substances, such as oxygen evolution catalysts, to catalysts and membrane ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/92H01M4/88
CPCH01M4/8652H01M4/8663H01M4/8828H01M4/921H01M4/923Y02E60/50
Inventor 史言闫常峰麦奕朗卢卓信郭常青王志达谭弘毅
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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