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Multi-wall carbon nano-tube carried core-shell silver-platinum cathode catalyst and preparation method

A technology of multi-walled carbon nanotubes and cathode catalysts, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of reducing catalytic efficiency and large catalyst particle size. , shedding and other problems, to achieve the effect of enhancing bonding, preventing reunion, and promoting development

Inactive Publication Date: 2012-10-10
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 relatively large, and the catalyst is only connected to the multi-walled carbon nanotube carrier by adsorption, so it is easy to fall off during the electrochemical reaction, thereby reducing the catalytic efficiency.

Method used

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  • Multi-wall carbon nano-tube carried core-shell silver-platinum cathode catalyst and preparation method
  • Multi-wall carbon nano-tube carried core-shell silver-platinum cathode catalyst and preparation method
  • Multi-wall carbon nano-tube carried core-shell silver-platinum cathode catalyst and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Weigh 92.7 ml, 1 mmol / L of AgNO 3 The solution and 84.6 mg of sodium citrate were dissolved in ethanol / deionized water (preferred volume ratio 1:1). After complete dissolution, 120 mg of concentrated nitric acid-treated multi-walled carbon nanotubes were added, fully stirred, and mixed evenly;

[0030](2) Dissolve 7.9 mg of sodium borohydride in 9.3 ml of ethanol, and add dropwise to the above reaction solution, stir, and react at room temperature for 2 hours. After the reaction is completed, wash the reacted liquid, suction filter, and dry at 60 ° C. Dry to constant weight to obtain Ag particles loaded on multi-walled carbon nanotubes.

[0031] (3) 65 milligrams of products that take step (2) are fully dispersed in ethylene glycol solution, add 2.325 milliliters, 0.077 mol / liter of H 2 PtCl 6 ·6H 2 O and fully stirred, the pH value of the system was adjusted to 8 with potassium hydroxide ethylene glycol solution, the temperature was raised to 90°C with stirring,...

Embodiment 2

[0034] (1) Weigh 185 milliliters, 1 mmol / L of AgNO 3 The solution and 168.9 mg of sodium citrate were dissolved in ethanol / deionized water (preferred volume ratio 1:1). After complete dissolution, 120 mg of multi-walled carbon nanotubes treated with concentrated nitric acid were added, fully stirred, and mixed evenly;

[0035] (2) Take 15.7 mg of sodium borohydride and dissolve it in 18.5 ml of ethanol, and add it dropwise to the above reaction solution, stir, and react at room temperature for 2 hours. Dry to constant weight to obtain Ag particles loaded on multi-walled carbon nanotubes.

[0036] (3) 70 milligrams of products that take step (2) are fully dispersed in ethylene glycol solution, add 1.990 milliliters, 0.077 mol / liter of H 2 PtCl 6 ·6H 2 O and fully stirred, the pH value of the system was adjusted to 8 with potassium hydroxide ethylene glycol solution, the temperature was raised to 90°C with stirring, and the temperature was kept constant for 6 hours. During th...

Embodiment 3

[0039] (1) Weigh 278 milliliters, 1 mmol / L of AgNO 3 The solution and 253.8 mg of sodium citrate were dissolved in ethanol / deionized water (preferred volume ratio 1:1). After complete dissolution, 120 mg of multi-walled carbon nanotubes treated with concentrated nitric acid were added, fully stirred, and mixed evenly;

[0040] (2) Dissolve 23.6 mg of sodium borohydride in 27.8 ml of ethanol, and add dropwise to the above reaction solution, stir, and react at room temperature for 2 hours. After the reaction is completed, wash the reacted liquid, suction filter, and dry at 60°C. Dry to constant weight to obtain Ag particles loaded on multi-walled carbon nanotubes.

[0041] (3) 75 milligrams of products that take step (2) are fully dispersed in ethylene glycol solution, add 1.660 milliliters, 0.077 mol / liter of H 2 PtCl 6 ·6H 2 O and fully stirred, the pH value of the system was adjusted to 8 with potassium hydroxide ethylene glycol solution, the temperature was raised to 90°C...

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Abstract

The invention relates to a multi-wall carbon nano-tube carried core-shell silver-platinum cathode catalyst and a preparation method, which belongs to the fuel cell catalyst technical field. According to the invention, the multi-wall carbon nano-tube is taken as a carrier, a core-shell structure which is characterized in that an active metal component is taken as a core, platinum which is taken as a shell layer is grown on the surface of the multi-wall carbon nano-tube. The preparation method employs sodium borohydride and glycol as a solvent and a reducing agent, a two-step reduction method is used, silver is reduced firstly to obtain the multi-wall carbon nano-tube silver-carrying particles; then platinum is reduced, the temperature and pH value of the reaction can be controlled, thereby the platinum is deposited on the surface of silver, so that the core-shell catalyst is prepared. According to the invention, the catalysis efficiency of the catalyst and the utilization rate of precious metals can be substantially increased, the oxygen reduction capability can be enhanced and the development of the fuel battery can be promoted.

Description

technical field [0001] The invention belongs to the technical field of fuel cell catalysts, in particular to a core-shell silver-platinum catalyst (AgPt / MWCNTs) loaded on multi-walled carbon nanotubes (MWCNTs) for fuel cells and a preparation method thereof. technical background [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...

Claims

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Application Information

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IPC IPC(8): H01M4/92B01J23/50
CPCY02E60/50
Inventor 于书平娄群韩克飞汪中明朱红
Owner BEIJING UNIV OF CHEM TECH
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