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Oxygen reduction catalyst and preparation method thereof

A catalyst and solvent technology, which is applied in the field of oxygen reduction catalyst and its preparation, can solve the problems of restricting the commercialization process of low-temperature fuel cells, high price, and shortage of resources, and achieve the effect of improving the catalytic performance of oxygen reduction and improving the half-wave point

Inactive Publication Date: 2017-02-22
CAPITAL NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, precious metals such as platinum and ruthenium are expensive and resources are scarce, which greatly restricts the commercialization of low-temperature fuel cells.

Method used

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  • Oxygen reduction catalyst and preparation method thereof
  • Oxygen reduction catalyst and preparation method thereof
  • Oxygen reduction catalyst and preparation method thereof

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preparation example Construction

[0025] The invention provides a preparation method of an oxygen reduction catalyst, comprising the steps of:

[0026] Mixing the carbon carrier and the solvent to obtain a carbon carrier suspension;

[0027] After mixing uric acid, iron salt and the carbon carrier suspension, the solvent is removed to obtain a solid mixture;

[0028] Under an inert atmosphere, the solids are mixed and calcined to obtain an oxygen reduction catalyst.

[0029] The invention mixes the carbon carrier and the solvent to obtain the carbon carrier suspension. In the present invention, the carbon carrier is preferably one, two or three of conductive carbon black, carboxylated multi-walled carbon nanotubes (pioneer nano) and graphene oxide (ACS material); the conductive carbon The black is preferably one, two or three of the conductive carbon blacks whose product models are XC-72, KJ-600 and BP-2000. In the present invention, the solvent is preferably one or more of methanol, ethanol, acetone and wa...

Embodiment 1

[0038] Add 40mg of conductive carbon black whose product model is XC-72 to 20ml of methanol solvent, and disperse ultrasonically for 30 minutes with a power of 500W and a working frequency of 40KHz to obtain a carbon carrier suspension.

[0039] 200mg uric acid, 40mgFeCl 3 ·6H 2 O salt was added to the above-mentioned carbon carrier suspension, ultrasonically dispersed for 30 minutes with a power of 500 W and a working frequency of 40 KHz, and the solvent was evaporated to obtain a solid mixture.

[0040] Under the protection of argon, the obtained solid mixture was heat-treated at 800°C for 3 hours to obtain a black powdery product, that is, Fe-N-C oxygen reduction catalyst, and its XPS spectrum is as follows: Figure 5 shown.

[0041] The present invention also tests the catalytic performance and stability of the Fe-N-C oxygen reduction catalyst obtained in this embodiment, and the test results are as follows Figure 1~3 shown.

[0042] figure 1 For the linear scanning ...

Embodiment 2

[0046] Add 60 mg of carboxylated multi-walled carbon nanotubes into 20 ml of ethanol solvent, and ultrasonically disperse for 20 minutes with a power of 400 W and a working frequency of 45 KHz to obtain a carbon carrier suspension.

[0047] 400mg uric acid, 40mgFeCl 2 The salt was added to the above-mentioned carbon carrier suspension, ultrasonically dispersed at a power of 400 W and a working frequency of 45 KHz for 20 minutes, and the solvent was evaporated to obtain a solid mixture.

[0048] The resulting solid mixture was heat-treated at 1000° C. for 1 h under the protection of nitrogen to obtain a black powdery product, namely Fe—N—C oxygen reduction catalyst.

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Abstract

The invention provides an oxygen reduction catalyst and a preparation method thereof. The preparation method includes the steps of mixing a carbon support with a solvent to obtain a carbon support suspension liquid; mixing uric acid, molysite and the carbon support suspension liquid, and desolventizing to obtain a solid mixture; sintering the solid mixture at an inert atmosphere to obtain the oxygen reduction catalyst. According to a result of an embodiment, the oxygen reduction catalyst is provided with an take-off potential at -0.01v vsAg / AgC1 / KC1(sat'd), an extreme diffusion current of the oxygen reduction catalyst can reach to -5.25mA / cm<2> as tested in a 1600rpm rotating disk electrode test, and accordingly, the oxygen reduction catalyst is excellent in oxygen reduction performance. Compared with a commercial platinized carbon catalyst, the oxygen reduction catalyst is more correct in half wave point and much lower in decrement amount which is 4.5%.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to an oxygen reduction catalyst and a preparation method thereof. Background technique [0002] Due to the advantages of environmental friendliness, quick start, no electrolyte loss, long life, high power density and energy density, low-temperature fuel cells have shown broad applications in power sources for electric vehicles, mobile power sources, micro power sources and small power generation devices. prospect. [0003] The cathodic oxygen reduction reaction of the fuel cell is the rate-controlling step of the electrocatalytic reaction of the fuel cell, and the oxygen reduction catalyst of the fuel cell is one of the hotspots in the research of the electrocatalysis of the fuel cell. [0004] At present, carbon-supported platinum and platinum alloy catalysts are the most widely used oxygen reduction catalysts for low-temperature fuel cells. However, precious metals such as pla...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/90Y02E60/50
Inventor 左霞马俊肖德健陈长利罗巧梅
Owner CAPITAL NORMAL UNIVERSITY
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