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Catalyst as well as preparation method and application thereof

A catalyst and solvent technology, applied in the field of catalyst and its preparation, can solve the problems of low catalytic activity, weak anti-CO toxicity of the catalyst, etc., and achieve the effects of strong catalytic activity, high anti-poisoning ability, and reduced binding force

Active Publication Date: 2020-03-24
深圳氢时代新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the existing core-shell structure catalysts have weak resistance to CO toxicity and low catalytic activity due to the particle size of the catalyst core and the excessive thickness of the catalyst shell.

Method used

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  • Catalyst as well as preparation method and application thereof
  • Catalyst as well as preparation method and application thereof
  • Catalyst as well as preparation method and application thereof

Examples

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preparation example Construction

[0048] The preparation method of catalyst of the present invention comprises the following processes:

[0049] The carbon support and the catalyst core precursor are dispersed in the solvent to obtain a first mixed solution, wherein the catalyst core precursor is a transition metal salt. In this process, in order to increase the dissolution rate, preferably ethanol or methanol is used as the solvent.

[0050] Since the activity of the catalyst is related to the particle size of the catalyst, the smaller the particle size, the larger the surface area and the higher the catalytic activity. The disadvantage of the impregnation reduction method is that the reduced metal particles are prone to agglomeration in the solution due to their small particle size. Phenomenon, agglomeration will affect the size of the final prepared catalyst particles, resulting in the inability to deposit a thin catalyst shell layer on the catalyst core, reducing the surface area of ​​the catalyst shell, t...

Embodiment 1

[0086] With carbon black as the carbon support, cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) as catalyst core precursor, with chloroplatinic acid (H 2 PtCl 6 ·6H 2 O) is the catalyst shell precursor, using ethanol as solvent, oleic acid as capping agent, and hydrazine hydrate, cetylamine and ethylene glycol as reducing agents to prepare Co-C@Pt core@shell catalysts.

[0087] Take by weighing 0.6g cobalt nitrate and dissolve in 5cc ethanol and 0.130cc oleic acid and mix well, then, weigh 944 mg of carbon black of Xc-72 model (the mass ratio of Co to carbon black is: 1 / 8) and add to the above solution and mix evenly to obtain the first mixed liquid.

[0088] Weigh 0.186g hydrazine hydrate, 0.0620g cetylamine and 0.0620g ethylene glycol respectively and put them into 10cc ethanol and mix uniformly to obtain a reducing agent solution. 2 Under protection, the prepared reducing agent solvent was added dropwise into the first mixed solution within 10 minutes (at a speed of 150-300 RPM)...

Embodiment 2

[0095] With carbon black as the carbon support, cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) as catalyst core precursor, with chloroplatinic acid (H 2 PtCl 6 ·6H 2 O) is the catalyst shell precursor, using ethanol as solvent, oleic acid as capping agent, and hydrazine hydrate, cetylamine and ethylene glycol as reducing agents to prepare Co-C@Pt core@shell catalysts.

[0096] Take by weighing 0.6g cobalt nitrate and dissolve in 5cc ethanol and 0.130cc oleic acid and mix well, then, weigh 944 mg of carbon black of Xc-72 model (the mass ratio of Co to carbon black is: 1 / 8) and add to the above solution and mix evenly to obtain the first mixed liquid.

[0097] Weigh 0.187g hydrazine hydrate, 0.0624g hexadecylamine and 0.0624g ethylene glycol respectively and put them into 10cc ethanol and mix uniformly to obtain a reducing agent solution. 2 Under protection, the prepared reducing agent solvent was added dropwise to the first mixed solution within 10 minutes (at a speed of 150-300 RP...

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Abstract

The embodiment of the invention discloses a catalyst as well as a preparation method and application thereof. The catalyst comprises a catalyst core and a catalyst shell coating the catalyst core, wherein the catalyst core is a compound of a carbon supporter and transition metal, the carbon supporter is a carrier, the transition metal is loaded on the carbon supporter, the catalyst shell is made of Pt, Pd, Ru, Rh or Au, and the thickness of the catalyst shell is 2.5 nm-4 nm. According to the present invention, the catalyst is prepared by using the strong reducing agent, the amine compound andthe polyol compound, such that the whole process is simple and easy to control, the catalyst with characteristics of low price, high poisoning resistance and strong catalytic activity can be prepared,and the important significance is provided for promotion of commercialization of PEM fuel cells.

Description

technical field [0001] The present invention relates to the field of fuel cells, more specifically, to a catalyst and its preparation method and application. Background technique [0002] Proton exchange membrane fuel cell (proton ex-change membrane fuel cell, PEMFC or PEM fuel cell) is a kind of fuel cell, because of its low operating temperature, fast start-up, high energy density, light weight, easy assembly, high reliability, Environmental protection and other advantages have attracted extensive attention from scientific researchers, and they have great potential to be widely used in the fields of automobiles, electronics, and aerospace. [0003] The single cell of a PEM fuel cell is composed of an anode, a cathode and a proton exchange membrane. The proton exchange membrane (protonexchange membrane, PEM) is located in the middle of the anode and the cathode. The membrane acts as an electrolyte, and a catalyst is provided between the proton exchange membrane, the cathod...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/92H01M4/88H01M8/1004
CPCH01M4/8825H01M4/9041H01M4/9083H01M4/921H01M4/926H01M8/1004Y02E60/50Y02P70/50
Inventor 瓦黑德·玛兹那尼王安闽姚文东
Owner 深圳氢时代新能源科技有限公司
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