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A method of synthesizing Pt-CeO2/C electro-catalyst by one-step microwaves

A technology of microwave synthesis and catalyst, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., to achieve the effects of energy saving, high electrocatalytic activity and high efficiency

Inactive Publication Date: 2009-03-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the rapid microwave heating method has been used to synthesize Pt-CeO in one step. 2 There is no published report on the literature of / C catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Dissolve chloroplatinic acid in ethylene glycol to prepare a solution with a concentration of 0.002mol / L. Take 50ml of this solution, add 10mL of 10mM cerium ammonium nitrate aqueous solution, the molar ratio of platinum and cerium in the solution is 1:1, then add 0.6ml of 1mol / L sodium acetate aqueous solution, the concentration of sodium acetate in the final synthesis solution is 0.01 mol / L. Then, 63 mg of XC-72 nanocarbons were added to the synthetic solution, and treated with ultrasonic waves to make them evenly mixed. Finally, the homogeneous mixture was transferred to a 250 ml round bottom flask and placed in a microwave oven with a reflux device and microwaved for 10 minutes. After cooling, the solid product was filtered and washed thoroughly with acetone and deionized water, and dried at 80 °C to obtain Pt-CeO 2 / C Catalyst. (The mass fraction of platinum in the catalyst is 20%, and the molar ratio Pt:Ce=1:1). The platinum nano-particles in the catalyst were...

Embodiment 2

[0020] Dissolve chloroplatinic acid in ethylene glycol to prepare a solution with a concentration of 0.004mol / L. Take 50ml of this solution, add 10mL of 10mM cerium ammonium nitrate aqueous solution, the molar ratio of platinum and cerium in the solution is 2:1, then add 1.2ml of 1mol / L sodium acetate aqueous solution, the concentration of sodium acetate in the final synthesis solution is 0.02 mol / L. Then, 143 mg of XC-72 nanocarbon was added to the synthetic solution, and it was mixed uniformly by ultrasonic treatment. Finally, the homogeneous mixture was transferred to a 250 ml round bottom flask and placed in a microwave oven with a reflux device and microwaved for 8 minutes. After cooling, the solid product was filtered and washed thoroughly with acetone and deionized water, and dried at 80 °C to obtain Pt-CeO 2 / C catalyst (the mass fraction of platinum in the catalyst is 20%, and the molar ratio Pt:Ce=2:1). The platinum nano-particles in the catalyst were observed by ...

Embodiment 3

[0024] Dissolve chloroplatinic acid in ethylene glycol to prepare a solution with a concentration of 0.002mol / L. Take 50ml of this solution, add 10mL of 10mM cerium ammonium nitrate aqueous solution, the molar ratio of platinum and cerium in the solution is 1:1, then add 0.6ml of 1mol / L sodium acetate aqueous solution, the concentration of sodium acetate in the final synthesis solution is 0.01 mol / L. Then, 63 mg of carbon nanotubes were added to the synthesis solution, and the mixture was uniformly mixed by ultrasonic treatment. Finally, the homogeneous mixture was transferred to a 250 ml round bottom flask and placed in a microwave oven with a reflux device and microwaved for 6 minutes. After cooling, the solid product was filtered and washed thoroughly with acetone and deionized water, and dried at 80 °C to obtain Pt-CeO 2 / CNTs catalyst (the mass fraction of platinum in the catalyst is 20%, and the molar ratio Pt:Ce=1:1). The platinum nano-particles in the catalyst were ...

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Abstract

The invention discloses an one-step method for synthesizing Pt-CeO2 / C catalyst by microwave. Chloroplatinic acid is dissolved in ethylene glycol, the concentration of the chloroplatinic acid in the solution is 0.002-0.005mol / L; ammonium ceric nitrate water solution in proper volume is added so that the mole ratio of Pt and Ce in the solution is 1:1 to 2.5:1; and then a small volume of sodium acetate water solution is added in the solution as stabilizer, the concentration of the sodium acetate in the solution is 0.01-0.03mol / L. Certain amount of nano carbon is added in the solution as carrier, and the nano carbon is fully dispersed in the solution through ultrasonic treatment. The even mixture is heated for 6 to 12 minutes by microwave under a condition of back flowing to be synthesized into Pt-CeO2 / C catalyst, the mass percentage of Pt in the catalyst is 20%, the mole ratio of the Pt to the Ce is 1:1-2.5:1. The nano carbon as the carrier is XC-72 nano carbon or carbon nanotube. The Pt-CeO2 / C catalyst synthesized by the method here has higher electro-catalytic activity and better resistance to CO intoxication over the oxidization of methanol by Pt / C, thereby the invention has the wide application in direct alcohol fuel battery.

Description

technical field [0001] The present invention relates to Pt-CeO 2 The preparation method of the / C electrocatalyst belongs to the technical field of catalyst preparation and the technical field of electrochemical energy. 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. However, the pure Pt / C catalyst is easy to adsorb the intermediate products of methanol oxidation (such as CO, etc.) during the electrocatalytic oxidation of methanol, which poisons its catalyst performance. Therefore, the synthesis of fuel cell catalysts with high catalytic activity and resistance to CO poisoning is of great significance and practical application value. There are two main methods for synthesizing this kind of catalyst with anti-CO poisoning: one is to form alloy catalysts of Pt and othe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01J21/18C25B3/02C25B3/23
Inventor 赵杰陈卫祥肖玉风李辉
Owner ZHEJIANG UNIV
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