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C2N graphene composite precious metal nanometer catalyst and preparation method thereof

A graphene composite and nano-catalyst technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, and final product manufacturing. It can solve problems such as poor dispersion, low loading, and poor catalyst stability, and achieve stable performance. , good thermal stability, the effect of improving power performance and service life

Inactive Publication Date: 2017-03-08
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the first aspect of the embodiment of the present invention provides a C 2 N graphene composite noble metal nanocatalysts to solve the problems of low loading of noble metal nanoparticles on graphene supports, poor dispersion and poor catalyst stability in the existing noble metal nanocatalyst technical solutions

Method used

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  • C2N graphene composite precious metal nanometer catalyst and preparation method thereof
  • C2N graphene composite precious metal nanometer catalyst and preparation method thereof
  • C2N graphene composite precious metal nanometer catalyst and preparation method thereof

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preparation example Construction

[0032] In the second aspect, the embodiment of the present invention provides a kind of above-mentioned C 2 The preparation method of N graphene composite noble metal nano-catalyst comprises the following steps:

[0033] Step 1: Put C 2 N graphene was placed in solvent and C was obtained after sonication 2 N graphene dispersion;

[0034] Step 2: Under an inert atmosphere, to the above obtained C 2 Adding a noble metal precursor to the N graphene dispersion liquid to obtain a mixed dispersion liquid, heating the mixed dispersion liquid to 60-200°C and adding a reducing agent, wherein the noble metal precursor: C 2 N graphene: mass ratio of reducing agent=0.5-20:1:0.3-15, after 1-24 hours of reaction, centrifugation, washing, drying, to obtain C 2 N graphene composite noble metal nanocatalysts, the C 2 N graphene composite noble metal nanocatalysts including C 2 N graphene support and attached to the C 2 Catalytically active noble metal nanoparticles on the surface of the...

Embodiment 1

[0049] Weigh 20mg C 2 N graphene was added to 200mL acetone, 200W ultrasonic for 30 minutes to get 0.1mg / mL C 2 N graphene dispersion. Then, under the protection of nitrogen atmosphere, to the above C 2 Add 42 mg of chloroplatinic acid to the N graphene dispersion to obtain a mixed dispersion. After heating the mixed dispersion to 50° C., 4 mg of sodium borohydride was added to react for 24 hours. Subsequently, the reaction product was centrifuged, washed, and dried to obtain C 2 N graphene composite platinum nanocatalysts.

Embodiment 2

[0051] Weigh 20mg C 2 N graphene was added to 10mL N-methylpyrrolidone, and 300°C ultrasonication for 20 minutes gave a concentration of 2mg / mL C 2 N graphene dispersion. Then, under the protection of nitrogen atmosphere, to the above C 2 Add 65mg chloroplatinic acid and 52mg chloroauric acid in the N graphene dispersion. After the mixed solution was heated to 200 degrees Celsius, 28 mg of ascorbic acid was added to react for 1 hour. Then, the reactant was centrifuged, washed and dried to obtain C 2 N graphene composite platinum-gold binary noble metal nanocatalyst.

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Abstract

The embodiment of the invention provides a C2N graphene composite precious metal nanometer catalyst, including a C2N graphene carrier and precious metal nanometer particles having the catalytic activity and attached on the C2N graphene carrier surface. The precious metal nanometer particles are uniformly distributed in the C2N graphene carrier surface through coordinate bond of the precious metal nanometer particles and nitrogen atoms in the C2N graphene carrier. The catalyst takes the C2N graphene as the carrier, therefore the precious metal nanometer particles can be uniformly dispersed in the graphene surface with high load capacity. The catalyst has excellent performances of high activity, good thermal stability, and high mechanical strength, and finally the power performance and service life of fuel cells and metal-air cells can be improved. The embodiment of the invention also provides a preparation method of the C2N graphene composite precious metal nanometer catalyst.

Description

technical field [0001] The invention relates to the field of nano catalysts for electrocatalytic reduction, in particular to a C 2 N graphene composite noble metal nano catalyst and preparation method thereof. Background technique [0002] At present, noble metals (Pt, Au, Pd, Ru, Ag, etc.) and their alloy nanoparticles formed with Fe, Co, Cr, Ni, Sn, Re, etc. are used as fuel cells and metal air for their excellent oxygen reduction catalytic performance. Electrocatalysts for batteries have been widely used and studied. In practical applications, the catalyst needs to be combined with a carrier to function, and the dispersion and loading of noble metal nanoparticles on the carrier have a great influence on the catalytic performance. To a certain extent, the better the dispersion and the higher the loading capacity, the larger the contact area between the catalyst and the reactant per unit area, and the more the amount of oxygen reduced per unit time. Correspondingly, the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J27/24H01M4/90H01M4/92H01M8/02
CPCB01J21/18B01J27/24H01M4/90H01M4/92H01M8/02Y02E60/50Y02P70/50
Inventor 谢封超周明梁家华
Owner HUAWEI TECH CO LTD