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PtRu/graphene nano electro-catalyst and preparation method thereof

An electrocatalyst, graphene technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. problem, to achieve the effect of energy saving efficiency and high electrocatalytic activity

Inactive Publication Date: 2010-06-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above methods, polymers are added as stabilizers for noble metal nanoparticles, and metal nanoparticles protected by polymers are difficult to directly load on carbon supports.
At the same time, as an application in the field of catalysts, the polymer protective agent must be removed at high temperature, and the metal nanoparticles will reunite during high temperature treatment, which will affect the electrocatalytic performance of the catalyst.
Therefore, this method cannot be directly used to prepare carbon materials supported noble metal nanoparticle catalysts.

Method used

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  • PtRu/graphene nano electro-catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0018] 160mg of graphite oxide nanosheets were dispersed in 300mL of glycerol by ultrasonic treatment, then 4mL of 0.05M chloroplatinic acid solution, 4mL of 0.05M ruthenium chloride solution and 3.0mL of 1.0mol / L sodium acetate solution were added, And stir well to mix well. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, heated by microwave radiation for 8 minutes, cooled, filtered, fully washed with acetone and deionized water, and dried at 90°C to obtain a PtRu / graphene nano-electrocatalyst. The PtRu alloy nanoparticles in the PtRu / graphene nano-electrocatalyst are highly dispersed on the graphene nanosheets and have a uniform particle size, with an average particle size of 3.0 nm. According to EDX analysis, the mass fraction of PtRu alloy in the catalyst is 29.5%, close to its theoretical value of 30%, and the atoms of PtRu alloy are Pt:Ru=1:1.

[0019] As a comparison, use XC-72 nano-carbon and carbon nanotubes (carbon nanotubes with...

Embodiment 2

[0022] 160mg of graphite oxide nanosheets were dispersed in 150mL of ethylene glycol by ultrasonic treatment, then 4mL of 0.05M chloroplatinic acid solution, 4mL of 0.05M ruthenium chloride solution and 2.0mL of 1.0mol / L sodium acetate solution were added, And stir well to mix well. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, heated by microwave radiation for 5 minutes, cooled, filtered, fully washed with acetone and deionized water, and dried at 85°C to obtain a PtRu / graphene nano-electrocatalyst. The PtRu alloy nanoparticles in the PtRu / graphene nano-electrocatalyst are highly dispersed on the graphene nanosheets, and have a uniform particle size, with an average particle size of 2.9 nm. According to EDX analysis, the mass fraction of PtRu alloy in the catalyst is 29.1%, close to its theoretical value of 30%, and the atoms of PtRu alloy are Pt:Ru=1:1.

[0023] As a comparison, use XC-72 nano-carbon and carbon nanotubes (carbon nanotu...

Embodiment 3

[0026] 160mg of graphite oxide nanosheets were dispersed in 500mL of ethylene glycol by ultrasonic treatment, then 4mL of 0.05M chloroplatinic acid solution, 4mL of 0.05M ruthenium chloride solution and 2.5mL of 1.0mol / L sodium acetate solution were added, And stir well to mix well. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, heated by microwave radiation for 10 minutes, cooled, filtered, fully washed with acetone and deionized water, and dried at 80°C to obtain a PtRu / graphene nano-electrocatalyst. The PtRu alloy nanoparticles in the PtRu / graphene nano-electrocatalyst are highly dispersed on the graphene nanosheets, and have a uniform particle size, with an average particle size of 2.9 nm. According to EDX analysis, the mass fraction of PtRu alloy in the catalyst is 30.5%, which is close to its theoretical value of 30%. The atoms of PtRu alloy are Pt:Ru=1:1.

[0027] As a comparison, use XC-72 nano-carbon and carbon nanotubes (carbon ...

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Abstract

The invention discloses a preparation method of PtRu / graphene nano electro-catalyst, comprising the following steps of: ultrasonically dispersing oxidized nano graphite sheets into liquid polylol; then adding a chloroplatinic acid solution and a sodium acetate solution, sufficiently mixing, wherein the content of the oxidized nano graphite sheets contained in a mixture is 0.3-1.1 g / L, the concentration of chloroplatinic acid is 0.0004-0.002 mol / L, the concentration of ruthenium chloride is 0.0004-0.0013 mol / L, and the concentration of sodium acetate is 0.005-0.027 mol / L; transferring the mixture to a microwave hydro-thermal reaction kettle for microwave hydro-thermal reaction for 5-10 minutes; and filtering, washing and drying to obtain the PtRu / graphene nano electro-catalyst, wherein the mass fraction of a PtRu alloy contained in the PtRu / graphene nano electro-catalyst is 20-40 percent, the mass fraction of graphene is 80-60 percent, the atomic ratio of the PtRu alloy is Pt:Ru=1:2-1.5:1, and the liquid polylol is propanetriol or glycol. The preparation method has energy saving, fastness, simple process, and the like; and in addition, the prepared PtRu / graphene nano electro-catalyst has good electrocatalysis property for the oxidation of methanol and ethanol and is widely used as anode catalysts of direct methanol fuel cells.

Description

technical field [0001] The invention relates to nanomaterials and preparation thereof, in particular to a PtRu / graphene nanometer electrocatalyst and a preparation method thereof, and belongs to the technical field of catalyst preparation and the technical field of electrochemical energy. Background technique [0002] Fuel cells are of great significance to environmental protection and utilization of clean energy. Direct alcohol fuel cells using methanol or ethanol as fuel have the advantages of high energy density, environmental friendliness, easy fuel portability, and low operating temperature, and have broad application prospects. However, some problems such as low electrocatalytic activity of anode catalysts for methanol or ethanol oxidation and high cost of platinum-based catalysts limit the wide application of direct alcohol fuel cells. Although platinum nanoparticles / carbon electrocatalysts have good electrocatalytic performance, pure platinum nanoparticles / carbon el...

Claims

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Application Information

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IPC IPC(8): H01M4/90B01J23/44H01M4/88
CPCY02E60/50
Inventor 陈卫祥赵杰李辉常焜俞贵艳
Owner ZHEJIANG UNIV
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