Graphene-based catalyst as well as preparation method and application thereof

An alkene-based catalyst and graphene-based technology, applied in electrochemical generators, fuel cells, electrical components, etc., can solve the problems of agglomeration growth, Pt catalyst failure, migration and merger, etc., and achieve simple catalytic activity and anti-poisoning ability High, avoid the effect of migration and merger

Active Publication Date: 2020-04-28
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

The performance of existing Pt / C catalysts will be greatly attenuated after long-term operation, and cannot meet the requirements of commercial long life. The main reason is that the force between Pt and C support is weak, and Pt is highly dispersed. Nanoscale particles on the C carrier have high specific surface energy and instability, and are prone to migration and merger, agglomeration and growth, or even desorption and dissolution on the C carrier, resulting in irreversible failure of the Pt catalyst.

Method used

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  • Graphene-based catalyst as well as preparation method and application thereof
  • Graphene-based catalyst as well as preparation method and application thereof
  • Graphene-based catalyst as well as preparation method and application thereof

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preparation example Construction

[0066] Two of object of the present invention is to provide a kind of preparation method of above-mentioned graphene-based catalyst, with reference to figure 1 , including the following procedures:

[0067] 1) Provide graphene-based carrier precursor, active catalyst particle precursor and pyrrole.

[0068] The graphene-based carrier precursor can be at least one of graphene, graphene oxide and nitrogen-doped graphene, preferably, the graphene-based carrier precursor is graphene oxide or nitrogen-doped graphene, which has higher activity , can provide greater adsorption and make the catalyst more stable.

[0069] When the active catalyst particle is a platinum group noble metal active catalyst particle, the precursor of the active catalyst particle may be a salt or an acid containing a platinum group noble metal.

[0070] When the active catalyst particles are platinum group noble metal alloy active catalyst particles, the precursor of the active catalyst particles includes ...

Embodiment 1

[0091] 1) Weigh 3.78g of graphene oxide, dissolve it in 50mL of water, ultrasonically disperse for 30min, and the ultrasonic frequency is 20KHZ, to obtain an aqueous solution of graphene oxide;

[0092] 2) Weigh 0.4g of pyrrole, disperse it in 30mL mixture of water and ethanol with a volume ratio of 1:1, mix evenly to obtain a pyrrole solution, add the pyrrole solution to the aqueous solution of graphene oxide, stir ultrasonically for 30min, and ultrasonically The frequency is 20KHZ;

[0093] 3) Measure 3mL of 0.37M H 2 PtCl 6 Add the aqueous solution to the mixed solution obtained in step 2), and ultrasonically stir for 30 minutes at an ultrasonic frequency of 20KHZ to obtain the first mixed solution; in the first mixed solution, the mass of Pt is 0.22g, accounting for 5% of the total mass of the catalyst;

[0094] 4) Insert electrodes with a spacing of 10 mm into the first mixed solution, apply an alternating current with a frequency of 100 Hz and a voltage gradient of 100...

Embodiment 2

[0101] 1) Weigh 3g of graphene oxide, dissolve it in 50mL of water, ultrasonically disperse for 30min, and the ultrasonic frequency is 50KHZ, to obtain an aqueous solution of graphene oxide;

[0102] 2) Weigh 0.3g of pyrrole, disperse in 30mL mixed solution of water and ethanol with a volume ratio of 1:1, mix evenly to obtain a pyrrole solution, add the pyrrole solution to the aqueous solution of graphene oxide, stir ultrasonically for 30min, and ultrasonically The frequency is 50KHZ;

[0103] 3) Measure 15mL of 0.37M H 2 PtCl 6 Add the aqueous solution to the mixed solution obtained in step 2), and ultrasonically stir for 30 minutes at an ultrasonic frequency of 50KHZ to obtain the first mixed solution; in the first mixed solution, the mass of Pt is 1.1g, accounting for 25% of the total mass of the catalyst;

[0104] 4) Insert electrodes with a spacing of 10 mm into the first mixed solution, apply an alternating current with a frequency of 100 Hz and a voltage gradient of 1...

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Abstract

The embodiment of the invention discloses a graphene-based catalyst as well as a preparation method and application thereof. The graphene-based catalyst comprises a graphene-based carrier, a polypyrrole spacer and active catalyst particles loaded on the graphene-based carrier, the polypyrrole spacer is positioned between the two adjacent layers of graphene-based carriers; the polypyrrole spacers are arranged in an oriented manner; the graphene-based carriers are directionally arranged; the oriented arrangement direction of the polypyrrole spacers is the same as the oriented arrangement direction of the graphene-based carrier, the mass ratio of the graphene-based carrier to the polypyrrole spacers is 95: 5-70: 30, and the mass of the active catalyst particles accounts for 5-25% of the totalmass of the catalyst. The catalyst is prepared by applying an electric field. The catalyst prepared by the invention has the excellent characteristics of strong catalytic performance, high stability,strong conductivity, strong CO toxicity resistance and the like.

Description

technical field [0001] The invention relates to the field of fuel cells, more specifically, to a graphene-based 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/92H01M4/86H01M8/1004
CPCH01M4/8663H01M4/9041H01M4/9083H01M4/921H01M4/926H01M8/1004Y02E60/50
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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