High catalytic activity graphene-Pd @ Pt core-shell structure nanoflower compound and preparation method thereof

A technology with high catalytic activity and core-shell structure, which is applied in the field of graphene-palladium-platinum core-shell structure nanoflower composites and its preparation, can solve the problems of weak binding force between nanoparticles and graphene, complex process, and reduced graphene Conductivity and other issues, to achieve the effect of improving atom utilization efficiency, simple process, and reducing the use of precious metals

Inactive Publication Date: 2015-10-07
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is relatively complicated, the binding force between nanoparticles and graphene is weak and easy to fall off, and the addition of surfactant covers the surface active sites of metal nanoparticles and reduces the conductivity of graphene.

Method used

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  • High catalytic activity graphene-Pd @ Pt core-shell structure nanoflower compound and preparation method thereof
  • High catalytic activity graphene-Pd @ Pt core-shell structure nanoflower compound and preparation method thereof
  • High catalytic activity graphene-Pd @ Pt core-shell structure nanoflower compound and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First, graphene oxide was prepared by the modified Staudenmaier method. The specific operation steps are as follows: Add 72ml of concentrated sulfuric acid with a mass concentration of 95-98% and 36ml of concentrated nitric acid with a mass concentration of 65-68% in a 500ml round bottom flask, stir magnetically for 15 minutes under ice bath conditions at 0°C, and then add 4g of natural Flake graphite, stirred vigorously to prevent agglomeration; after the dispersion is uniform, add 44g of potassium chlorate, and finally remove the ice bath and react for 96 hours; after the reaction is completed, the product is washed, ultrasonically stripped, flocculated with sodium hydroxide and dried at 60°C for 24 hour, grind to obtain graphene oxide solid powder;

[0027] Then the graphene-palladium composite was prepared, and the specific steps were as follows: 10 mg graphene oxide powder was ultrasonically dispersed in 100 ml deionized water to obtain a monodisperse graphene...

Embodiment 2

[0032]According to the preparation method of embodiment 1, just the reaction time of the preparation graphene-palladium composite stage is adjusted to 30 min by 60 min, obtain as follows figure 2 The shape shown.

Embodiment 3

[0034] Press the preparation method of embodiment 1, just adjust the reaction time of preparing graphene-palladium composite stage from 60 min to 90 min, obtain the same as figure 2 The results shown.

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Abstract

The present invention relates to a high catalytic activity graphene-Pd @ Pt core-shell structure nanoflower compound and a preparation method thereof. First, at room temperature, ascorbic acid is used for reducing an aqueous solution of graphene oxide and palladium chloride to obtain palladium nanoparticles with regular morphology and assemble the palladium nanoparticles in situ onto the chemically-reduced graphene, then the resulting graphene-palladium is used as a seed crystal, seed growth method is used, chloroplatinic acid is added into the reaction solution, and the microwave-assisted rapid reduction of the chloroplatinic acid is perforemed to obtain graphene supported Pd @ Pt core-shell structure nanoflower. The electrochemical data shows that under alkaline conditions, the catalytic oxidation activity of the graphene-Pd @ Pt core-shell structure nanoflower compound is much higher than that of a graphene-platinum-palladium alloy compound, and the graphene-platinum compound and a commercial platinum carbon catalyst show great potential as fuel cell electrode material. The preparation process is simple, materials are non-toxic and harmless, and Pd @ Pt core-shell structure nanoparticles monodispersed on the graphene can be obtained without adding of any additional surfactant.

Description

technical field [0001] The invention relates to the field of preparation of nanocomposite materials, in particular to a graphene-palladium platinum core-shell structure nanoflower composite with high catalytic activity and a preparation method thereof. Background technique [0002] Due to the advantages of high catalytic activity and stability due to the coupling effect and synergistic effect between metals, noble metal bimetallic nanocrystals have become a research hotspot in recent years. Platinum and palladium, as two important noble metals, have been widely used in the field of catalysis. , such as the oxidation of CO, the oxidation of small molecules such as methanol, using the coupling effect between metals, designing porous palladium-platinum core-shell structure nanocrystals can not only improve its catalytic activity, but also enhance its stability, which can be used as A catalyst for the reaction of methanol oxidation at the anode of a direct methanol fuel cell, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J35/02B82Y30/00B82Y40/00H01M4/92
CPCY02E60/50
Inventor 王贤保陈易梅涛李金华王建颖
Owner HUBEI UNIV
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