Carbon-loaded kernel-shell copper-palladium-platinum catalyst for fuel battery and preparation method thereof

A fuel cell and platinum catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of reduced catalytic efficiency, large catalyst particle size, shedding, etc. problem, to achieve the effect of strengthening combination, improving effect and promoting development

Inactive Publication Date: 2012-09-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the operation process is simple and the preparation cost is low, but the particle size of the catalyst is too large, and the cata

Method used

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  • Carbon-loaded kernel-shell copper-palladium-platinum catalyst for fuel battery and preparation method thereof
  • Carbon-loaded kernel-shell copper-palladium-platinum catalyst for fuel battery and preparation method thereof
  • Carbon-loaded kernel-shell copper-palladium-platinum catalyst for fuel battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh 39.32mg copper sulfate pentahydrate (10mg Cu), 50mg citric acid (C 6 h 8 o 7 ), 30ml ethylene glycol was put into the there-necked flask, and then 1.666ml palladium chloride aqueous solution (10mg Pd, 10g / L PdCl 2 Aqueous solution), wherein copper sulfate pentahydrate and palladium chloride are the precursors of Cu and Pd simple substances, citric acid is used as complexing agent to prevent agglomeration to generate larger nanoparticles, ethylene glycol is used as solvent and reducing agent, and its larger The viscosity can also help to generate small and uniform catalyst particles. After the copper sulfate pentahydrate is dissolved, add 80 mg of Vulcan XC-72 conductive carbon black (XC-72 carbon spheres) to the solution, stir well to disperse the carbon powder evenly, and obtain a mixed solution.

[0028] (2) Then adjust the pH of the mixed solution to 10 with potassium hydroxide in ethylene glycol (KOH / EG) solution. The temperature of the mixture was rai...

Embodiment 2

[0035] (1) Weigh 19.66mg copper sulfate pentahydrate (5mg Cu), 50mg citric acid (C 6 h 8 o 7 ), 30ml ethylene glycol was put into the there-necked flask, and then 833ul palladium chloride aqueous solution (5mg Pd, 10g / L PdCl 2 aqueous solution). Wherein copper sulfate pentahydrate and palladium chloride are the precursors of Cu and Pd simple substance, citric acid is used as complexing agent to prevent agglomeration from generating larger nanoparticles, ethylene glycol is used as solvent and reducing agent, and its larger viscosity also Can help to generate small and uniform catalyst particles. After the copper sulfate pentahydrate is dissolved, add 80 mg of Vulcan XC-72 conductive carbon black (XC-72 carbon spheres) to the solution, stir well to disperse the carbon powder evenly, and obtain a mixed solution.

[0036] (2) Then adjust the pH of the mixture to 10 with KOH / EG. The temperature of the mixture was raised to 170°C, and the reaction time was 4 hours. During the t...

Embodiment 3

[0040] (1) Weigh 19.66mg copper sulfate pentahydrate (5mg Cu), 50mg citric acid (C 6 h 8 o 7 ) 30ml ethylene glycol is put into the there-necked flask, then add 470ul palladium chloride aqueous solution (5mg Pd, 17g / L PdCl 2 aqueous solution). Wherein copper sulfate pentahydrate and palladium chloride are the precursors of Cu and Pd simple substance, citric acid is used as complexing agent to prevent agglomeration from generating larger nanoparticles, ethylene glycol is used as solvent and reducing agent, and its larger viscosity also Can help to generate small and uniform catalyst particles. After the copper sulfate pentahydrate is dissolved, add 80 mg of Vulcan XC-72 conductive carbon black (XC-72 carbon spheres) to the solution, stir well to disperse the carbon powder evenly, and obtain a mixed solution.

[0041] (2) Then adjust the pH of the mixture to 10 with KOH / EG. The temperature of the mixture was raised to 190°C, and the reaction time was 2 hours. During the tem...

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Abstract

The invention provides a carbon-loaded kernel-shell copper-palladium-platinum catalyst for a fuel battery and a preparation method thereof. Conductive carbon black is used as a carrier, an active component is a copper-palladium-platinum alloy with a nuclear-shell structure, wherein the copper palladium is a kernel, the platinum is a shell, and the catalyst comprises the following ingredients by mass percent: 70 to 91 percent of conductive carbon black, 2 to 10 percent of copper, 2 to 10 percent of palladium and 5 to 10 percent of platinum. A two-step reduction method is utilized, namely, low-activity metal is firstly reduced, then the active precious metal is reduced, the precious metal is precipitated on the surface of the non-precious metal by controlling the reaction temperature and the pH value, and a kernel-shell catalyst is formed through a dealloying step; and in addition, the carbon carrier is added in the preparation process, so that the nano metal particles can directly grow on the carrier, the combination of the catalyst particles and the carbon carrier can be enhanced, and the catalyst is more stable. Due to the adoption of the preparation method, the catalyzing efficiency of the catalyst and the utilization rate of the precious metal can be greatly improved, and the development of the fuel battery can be promoted.

Description

technical field [0001] The invention relates to a carbon-loaded core-shell type copper-palladium-platinum alloy catalyst (CuPdPt / C) for fuel cells and a preparation method thereof. Background technique [0002] A fuel cell is an electrochemical device that directly converts chemical energy into electrical energy. One of its key materials is an electrode catalyst. For a long time, noble metals such as platinum and ruthenium have been widely used because of their excellent catalytic performance. However, due to the limited content of platinum group metals in the earth's crust, the price is high, and the rate of platinum in batteries is not high, which limits the development of fuel cells. Although the alloy catalyst can reduce the loading of Pt and improve the catalytic efficiency, the stability of the catalyst needs to be improved. Due to their unique catalytic properties, core-shell catalysts have attracted more and more attention in recent years, and thus have been widely ...

Claims

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Application Information

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IPC IPC(8): H01M4/92B01J23/89
CPCY02E60/50
Inventor 朱红骆明川王芳辉
Owner BEIJING UNIV OF CHEM TECH
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