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

[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.

[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.

[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.