Method for synthesizing PdPt/graphene nano electrical catalyst in one step by microwave process

An electrocatalyst and graphene technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as long time and complexity, and achieve improved efficiency, Improve the effect of uniform distribution and outstanding mechanical properties

Inactive Publication Date: 2011-08-17
NANJING NORMAL UNIVERSITY
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AI-Extracted Technical Summary

Problems solved by technology

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Abstract

The invention discloses a method for synthesizing a PdPt/graphene nano electrical catalyst in one step by a microwave process, which comprises: dispersing graphene oxide in aqueous solution of quaternary ammonium salt surfactant through ultrasonic waves, adding solution of a soluble Pd II salt or PtII salt, fully and uniformly mixing, regulating the pH value of mixed solution, adding a reducer, uniformly mixing, reacting under radiation of microwaves to reduce palladium and platinum metal ions and graphene oxide, and cooling, washing and drying the reactants to obtain the PdPt/graphene nano electrical catalyst. The method has the characteristics of energy conservation, environmental protection, quickness, simple process and the like. The obtained PdPt/graphene nano electrical catalyst hasa high electric catalysis performance for the electrochemical oxidization of methanol.

Application Domain

Technology Topic

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  • Method for synthesizing PdPt/graphene nano electrical catalyst in one step by microwave process
  • Method for synthesizing PdPt/graphene nano electrical catalyst in one step by microwave process
  • Method for synthesizing PdPt/graphene nano electrical catalyst in one step by microwave process

Examples

  • Experimental program(3)
  • Comparison scheme(4)

Example Embodiment

[0030] Example 1
[0031] Disperse 1 mL of 2 mg/mL graphene oxide ultrasonically in 50 mL of 25 mmol/L cetyltrimethylammonium bromide aqueous solution, and then add 0.75 mL of 48 mmol/L chlorination Palladium solution and 0.5 mL of 24 mmol/L potassium chloroplatinate solution are mixed thoroughly. The pH of the mixed solution was adjusted to 9.0 with an aqueous sodium hydroxide solution. Add 0.402g of ascorbic acid and mix well. Transfer the solution to a microwave chemical reactor, connect the condensed water, set the power to 200 W, take it out after microwave heating for 4 minutes, cool it to room temperature naturally, take out the sample and wash it by centrifugation (washed with water and ethanol for three times), 60 o After drying with C, a PdPt/graphene composite material is obtained, wherein the ratio of the amount of Pd to Pt is 3:1. Observed by transmission electron microscope, PdPt bimetallic nanoparticles are dispersed on the surface of the graphene sheet. The bimetallic nanoparticles exhibit a core-shell structure, where the Pd cube is the core and the surface is covered with Pt particles with a particle size of 3-4 nm.

Example Embodiment

[0032] Example 2
[0033] Disperse 1 mL of 2 mg/mL graphene oxide ultrasonically in 50 mL of 25 mmol/L cetyltrimethylammonium bromide aqueous solution, and then add 0.5 mL of 48 mmol/L chlorination Palladium solution and 1 mL of 24 mmol/L potassium chloroplatinate solution are mixed thoroughly. The pH of the mixed solution was adjusted to 9.0 with an aqueous sodium hydroxide solution. Add 0.402g of ascorbic acid and mix well. Transfer the solution to a microwave chemical reactor, connect the condensed water, set the power to 200 W, take it out after microwave heating for 4 minutes, cool it to room temperature naturally, take out the sample and wash it by centrifugation (washed with water and ethanol for three times), 60 o After drying with C, a PdPt/graphene composite material is obtained, wherein the ratio of the amount of Pd to Pt is 1:1. Observed by transmission electron microscope, PdPt bimetallic nanoparticles are dispersed on the surface of the graphene sheet. The bimetallic nanoparticles exhibit a core-shell structure. The Pd cube is the core and the surface is covered with Pt particles with a particle size of 3-4 nm. Compared with the product obtained in Example 1, the amount of Pt nanoparticles covered on the surface of the Pd cube is increased.

Example Embodiment

[0034] Example 3
[0035] Disperse 1 mL of 2 mg/mL graphene oxide ultrasonically in 50 mL of 25 mmol/L cetyltrimethylammonium bromide aqueous solution, and then add 0.25 mL of 48 mmol/L chlorination Palladium solution and 1.5 mL of 24 mmol/L potassium chloroplatinate solution are mixed thoroughly. The pH of the mixed solution was adjusted to 9.0 with an aqueous sodium hydroxide solution. Add 0.402 g of ascorbic acid and mix well. Transfer the solution to a microwave chemical reactor, connect the condensed water, set the power to 200 W, take it out after microwave heating for 4 minutes, cool it naturally to room temperature, take out the sample and wash it ultrasonically (washed with water and washed with ethanol three times), 60 o After drying C, a PdPt/graphene composite material is obtained, wherein the ratio of the amount of Pd to Pt is 1:3. Observed by transmission electron microscope, PdPt bimetallic nanoparticles are dispersed on the surface of the graphene sheet. The bimetallic nanoparticles exhibit a core-shell structure. The Pd cube is the core and the surface is covered with Pt particles with a particle size of 3-4 nm. Compared with the product obtained in Example 2, the density of the Pt particles covered on the surface of the Pd has increased, and the coverage is almost complete.
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PUM

PropertyMeasurementUnit
Particle size3.0 ~ 4.0nm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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