Platinum/graphene nano electro-catalyst and preparation method thereof

A technology of electrocatalysts and graphite nanosheets, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. It can solve the problems that metal nanoparticles are difficult to directly load and affect the electrocatalytic performance of catalysts, and achieve energy saving efficiency effect

Inactive Publication Date: 2010-06-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the polymer-protected metal nanoparticles obtained by this method are difficult to directly support on carbon supports.
At the same time, as an application in the field of catalysts, the polym

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Disperse 190mg of graphite oxide nanosheets in 400mL of glycerol by ultrasonic treatment, then add 4mL of 0.05M chloroplatinic acid solution and 3.0mL of 1.0mol / L sodium acetate solution, and stir and mix well. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, and the reaction was heated by microwave radiation for 5 min. After cooling, filter, fully wash with acetone and deionized water, and dry at 90°C to obtain a platinum / graphene nanometer electrocatalyst. The platinum nanoparticles in the platinum / graphene nano-electrocatalyst are highly dispersed on the graphene nanosheets and have a uniform particle size, with an average particle size of 2.8 nm. EDX analysis showed that the mass fraction of platinum in the catalyst was 19.4%, close to the theoretical value of 20%.

[0021] As a comparison, use XC-72 nano-carbon and carbon nanotubes (carbon nanotubes with a diameter of 30-40nm, pretreated with concentrated nitric acid and sulfuri...

Embodiment 2

[0024] Disperse 400mg of graphite oxide nanosheets in 300mL of ethylene glycol by ultrasonic treatment, then add 16mL of 0.05M chloroplatinic acid solution and 4mL of 1.0mol / L sodium acetate solution, and stir and mix well. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, and the reaction was heated by microwave radiation for 10 min. After cooling, it is filtered, fully washed with acetone and deionized water, and dried at 90°C to obtain a Pt / graphene nanometer electrocatalyst. The platinum nanoparticles in the Pt / graphene nano-electrocatalyst are highly dispersed on the graphene nanosheets and have a uniform particle size, with an average particle size of 3.1 nm. EDX analysis showed that the mass fraction of platinum in the catalyst was 39.3%, which was close to the theoretical value of 40%.

[0025] As a comparison, use XC-72 nanocarbon and carbon nanotubes as supports respectively, and synthesize Pt / XC-72 nanometer electrocatalyst (the m...

Embodiment 3

[0028] Disperse 290mg of graphite oxide nanosheets in 300mL of ethylene glycol by ultrasonic treatment, then add 2mL of 0.05M chloroplatinic acid solution and 2mL of 1.0mol / L sodium acetate solution, and stir and 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 Pt / graphene nanometer electrocatalyst. The platinum nanoparticles in the Pt / graphene nano-electrocatalyst are highly dispersed on the graphene nanosheets and have a uniform particle size, with an average particle size of 2.8 nm. EDX analysis shows that the mass fraction of platinum in the catalyst is 9.6%, which is close to the theoretical value of 10%.

[0029] As a comparison, use XC-72 nanocarbon and carbon nanotubes as supports respectively, and synthesize Pt / XC-72 nanometer electrocatalyst (the mass fraction of platinum is 10%) and ...

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Abstract

The invention discloses a platinum/graphene nano electro-catalyst. The platinum/graphene nano electro-catalyst uses graphene as a carrier and uses platinum as an active component, wherein the mass fraction of the platinum in the catalyst is 10 to 40 percent. A preparation method comprises the following steps: 1) ultrasonically dispersing an oxidized graphite nano sheet into liquid polyalcohol, then adding chloroplatinic acid solution and sodium acetate solution into the liquid polyalcohol, and fully mixing the solution uniformly, wherein the content of the oxidized graphite nano sheet in the mixture is between 0.48 and 1.3 g/L, the concentration of the chloroplatinic acid is between 0.0005 and 0.005 mol/L and the concentration of the sodium acetate is between 0.007 and 0.013 mol/L; and 2) transferring the mixture to a microwave hydrothermal reaction kettle, heating the mixture by microwave to react for 5 to 10 minutes, and then filtering, washing and drying the reaction product to obtain the platinum/graphene nano electro-catalyst. The preparation method of the invention has the advantages of energy conservation, quickness, simple process and the like. The particle diameters of the platinum nano particles in the prepared platinum/graphene nano electro-catalyst are uniform. The catalyst has good electro-catalysis performance, and has wide application in a fuel cell.

Description

technical field [0001] The invention relates to a platinum / graphene nano electrocatalyst and a preparation method thereof. Background technique [0002] Platinum / carbon materials with carbon-supported platinum metal nanoparticles have been widely used as catalysts in chemical engineering, especially as electrocatalysts in fuel cells, due to their excellent catalytic properties. It is well known that the catalyst support has a great influence on the performance of the catalyst. Activated carbon, XC-72 nanocarbon, carbon nanotubes, etc. are some carbon materials with different forms and shapes, and they are also commonly used catalyst supports. These different carbon materials as supports to support noble metal Pt nanoparticles have a great influence on the electrocatalytic performance of the catalysts. XC-72 nano carbon is a commercial nano carbon material, which is widely used as fuel cell catalyst carrier. Carbon nanotubes have also been extensively studied as catalyst s...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J21/18B01J37/34B01J35/10H01M4/96H01M4/90
CPCY02E60/50
Inventor 陈卫祥赵杰马琳李辉俞贵艳
Owner ZHEJIANG UNIV
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