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Unsupported fuel cell catalyst slurry and preparation method thereof

A catalyst slurry and fuel cell technology, applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., can solve the problems of reducing the effective active area of ​​catalysts, increasing resistance, reducing electron conduction channels, etc., and reaching the catalytic layer Orderly structure and performance-enhancing effects

Inactive Publication Date: 2012-01-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the proton-conducting polymer is used as a protective agent to prepare metal nanoparticle catalysts for fuel cells. The amount of proton-conducting polymer added is critical. In order to effectively control the particle size of the catalyst, a large amount of proton-conducting polymer should be added appropriately , but from the perspective of practical application, there is an appropriate limit for the amount of addition. Too much proton-conducting polymer is coated on the surface of metal nanoparticles. On the one hand, it limits the contact between the reactant gas and the metal catalyst and reduces the effective activity of the catalyst. On the other hand, it also reduces the contact between metal nanoparticles to a certain extent, reduces the channel for electronic conduction, and increases the resistance

Method used

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  • Unsupported fuel cell catalyst slurry and preparation method thereof
  • Unsupported fuel cell catalyst slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Accurately weigh 400 mg of Nafion solution with a mass concentration of 5%, add it to the mixture of propanol and water, the mass ratio of propanol to water is 1:1, stir for 6 minutes, add 80 mg of Pt in H 2 PtCl 6 The solution continued to stir for 30 minutes, adding NaOH to adjust the pH of the solution to 9 and 5ml of formaldehyde, stirring and heating to reflux at 90°C to keep the pH of the solution at 9, and reacting for 60 minutes to finally obtain a stable dark brown Pt colloidal solution. The obtained colloidal solution adopts dialysis bag in the mixed solution of propanol and water (wherein the mass fraction of propanol and water is respectively 95% and 5%) dialysis treatment removes organic by-product and impurity ion, and the cut-off molecular weight of dialysis bag is 14000Da , to obtain a catalyst slurry for preparing a fuel cell catalyst layer, wherein the mass fraction of the metal catalyst is 1%.

[0038] Prepare fuel cell electrodes with the prepared c...

Embodiment 2

[0048] Accurately weigh 800 mg of SPEEK solution with a mass concentration of 5%, add it into the mixture of ethanol and water, the mass ratio of ethanol and water is 2:1, stir for 10 minutes, add 80 mg of Pt in H 2 PtCl 6 The solution was stirred for 30 minutes and Na was added 2 CO 3 Adjust the pH of the solution to 10 and 5ml of sodium citrate, stir and heat to reflux at 85°C, keep the pH of the solution at 10, react for 50 minutes, and finally obtain a stable dark brown Pt colloidal solution. The obtained colloidal solution adopts dialysis bag in the mixed solution of ethanol and water (wherein the mass fraction of ethanol and water is respectively 94% and 6%) and dialysis process removes organic by-product and impurity ion, and the cut-off molecular weight of dialysis bag is 7000Da , to obtain a catalyst slurry for preparing a fuel cell catalyst layer, wherein the mass fraction of the metal catalyst is 1.5%.

[0049] The preparation of MEA, single cell assembly and tes...

Embodiment 3

[0051] Accurately weigh 300 mg of SPEEK solution with a mass concentration of 5%, add it to the mixture of methanol and water, the mass ratio of methanol to water is 0.8:1, stir for 8 minutes, add 60 mg of Pt in H 2 PtCl 6 solution and H containing 20mgIr 2 IrCl 6 The solution was stirred for 30 minutes, and NaOH was added to adjust the pH of the solution to 10 and 5ml of acetaldehyde, stirred and heated to reflux at 90° C. to keep the pH of the solution at 10, and reacted for 40 minutes to finally obtain a stable dark brown PtIr colloidal solution. The obtained colloidal solution adopts dialysis bag in the mixed solution of methanol and water (wherein the mass fraction of methanol and water is respectively 93% and 7%) dialysis treatment removes organic by-product and impurity ion, and the cut-off molecular weight of dialysis bag is 14000Da , to obtain a catalyst slurry for preparing a fuel cell catalyst layer, wherein the mass fraction of the metal catalyst is 3%.

[0052]...

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Abstract

The invention discloses unsupported fuel cell catalyst slurry and a preparation method thereof. Metal nanoparticles of a catalyst are modified by proton-conducting polymer. The preparation method is characterized in that: 1) in the process of preparing the catalyst, polymer with proton conducting function is taken as a protector; 2) in the process of preparing the catalyst, a small amount of the proton-conducting polymer is only added, and the mass ratio of the proton-conducting polymer to the metal catalyst meets the requirement on the mass ratio of the two of compositions of a fuel cell catalytic layer, and has a range of 0.02-1:1; 3) after impurities of reaction products are removed, the proton-conducting polymer is not required to be added again or removed and can be directly used forpreparing the fuel cell catalytic layer; 4) the average grain diameter of the catalyst prepared is between 2 and 3nm; and 5) the prepared catalyst is applied to fuel cells, and the fuel cells have good performance.

Description

technical field [0001] The invention relates to a catalyst in the field of fuel cells, in particular to a fuel cell catalyst with the function of conducting protons and a preparation method thereof. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of hydrogen and oxygen into electrical energy through an electrode reaction. The biggest feature of this device is that no combustion is involved in the reaction process, and its energy conversion efficiency is not limited by the "Carnot cycle", so its energy conversion rate is as high as 60%-80%, and the actual use efficiency is 2 times that of ordinary internal combustion engines. -3 times. In addition, it also has the advantages of diversified fuels, low noise, and little environmental pollution. [0003] At present, the catalysts used in fuel cells are mainly platinum or platinum alloys. In the process of preparing metal nanoparticles, adding a protective agent can effectively ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/10H01M4/90H01M4/92B01J23/56
CPCY02E60/50
Inventor 张华民张益宁马原蔚程金斌
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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