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Method of synthesizing Pt-CeO*/C electro-catalyst with one-step method microwave

A microwave synthesis, catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., to achieve high electrocatalytic activity, improve anti-CO poisoning performance, efficiency and energy saving Effect

Inactive Publication Date: 2008-01-23
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 50 milliliters of this solution, add 10 mL of 10 mM cerium ammonium nitrate aqueous solution, the molar ratio of platinum and cerium in the solution is 1:1, then add 0.6 milliliters 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-particle...

Embodiment 2

[0020] Dissolve chloroplatinic acid in ethylene glycol to prepare a solution with a concentration of 0.004mol / L. Take 50 milliliters of this solution, add 10 mL of 10 mM cerium ammonium nitrate aqueous solution, the molar ratio of platinum and cerium in the solution is 2:1, then add 1.2 milliliters 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 fully washed with lactone 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 ...

Embodiment 3

[0024] Dissolve chloroplatinic acid in ethylene glycol to prepare a solution with a concentration of 0.002mol / L. Take 50 milliliters of this solution, add 10 mL of 10 mM cerium ammonium nitrate aqueous solution, the molar ratio of platinum and cerium in the solution is 1:1, then add 0.6 milliliters 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...

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Abstract

The invention discloses a one-step microwave compounding Pt-CeO2 / C catalyst method, which dissolves chloroplatinic acid in ethylene glycol, the concentration of the chloroplatinic acid in the solution is between 0.002 to 0.005mol / L; then adding ammonium ceric nitrate water solution with certain volume and make the mol ratio of Pt and Ce in the solution is 1 / 1 to 2.5 / 1; then add small volume sodium acetate water solution in the solution as stabilizer, the concentration of the sodium acetate in solution is between 0.01 to 0.03mol / L. Add a certain volume Nami carbon as carrier, use supersonic process to dissolve the Nami carbon material in the solution fully. Heat the even mixture with microwave for 6 to 12min under the situation of reflow, compound to achieve Pt-CeO2 / C catalyst, the quality per centage of Pt in the catalyst is 20 per cent, the mol ratio of Pt and Ce is between 1 / 1 to 2.5 / 1, the Nami carbon as the carrier is XC-72 Nami carbon or carbon Nami tube. The Pt-CeO2 / C catalyst compounded by the method in the invention has higher electrocatalysis activity and better anti-CO poisoning performance to the oxidizing of methanol, which has wide application in direct alcohols 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 Applications(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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