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Ternary core-shell structure nanometer electrocatalyst and preparation method thereof

An electrocatalyst, core-shell structure technology, applied in nanotechnology, nanotechnology, structural parts, etc., to achieve the effect of improving utilization, mild conditions, and simple process

Active Publication Date: 2018-04-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method has mild synthetic conditions and simple operation, and has not been reported in the literature yet.

Method used

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  • Ternary core-shell structure nanometer electrocatalyst and preparation method thereof
  • Ternary core-shell structure nanometer electrocatalyst and preparation method thereof
  • Ternary core-shell structure nanometer electrocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh out 40mgHAuCl 4 , 50 mg H 2 PtCl 4 and 17 mg CuCl 2 2H 2 O, add 26ml of water to dissolve. Then add 0.194g of reducing agent octadecylamine, and stir at room temperature for 12h. The obtained mixture solution was put into a polytetrafluoroethylene reaction kettle, and reacted for 63 hours at 160° C. in a blast drying oven to obtain a black mixture solution. The black mixture solution was centrifuged and washed with a mixture of n-hexane and ethanol. Finally dry at room temperature.

Embodiment 2

[0029] Weigh out 40mgHAuCl 4 , 50 mg H 2 PtCl 4 and 49.7 mg CuCl 2 2H 2 O, add 26ml of water to dissolve. Then add 0.194g of reducing agent octadecylamine, and stir at room temperature for 12h. The obtained mixture solution was put into a polytetrafluoroethylene reaction kettle, and reacted for 63 hours at 160° C. in a blast drying oven to obtain a black mixture solution. The black mixture solution was centrifuged and washed with a mixture of n-hexane and ethanol. Finally dry at room temperature.

Embodiment 3

[0031] Weigh out 40mgHAuCl 4 , 50 mg H 2 PtCl 4 and 98.3 mg CuCl 2 2H 2 O, add 26ml of water to dissolve. Then add 0.194g of reducing agent octadecylamine, and stir at room temperature for 12h. The obtained mixture solution was put into a polytetrafluoroethylene reaction kettle, and reacted for 63 hours at 160° C. in a blast drying oven to obtain a black mixture solution. The black mixture solution was centrifuged and washed with a mixture of n-hexane and ethanol. Finally dry at room temperature.

[0032] figure 1 It is the transmission electron microscope image of the Pt@PtAuCu ternary core-shell structure. Depend on figure 1 It can be seen that the ternary core-shell nanocatalysts prepared in Example 1 are uniformly dispersed.

[0033] figure 2 It is the XRD pattern of Example 1Pt@PtAuCu ternary core-shell structure and Comparative Example 1PtCu. It can be seen from the figure that the PtCu peak of the catalyst in Example 1 moves at a low angle relative to the p...

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Abstract

A ternary core-shell structure nanometer electrocatalyst and a preparation method thereof belong to the technical field of chemical energy. The preparation method comprises the steps of (1) adding a certain amount of metal precursor into deionized water, adding octadecylamine again, and performing stirring for 12 hours to obtain a uniform mixed liquid; (2) placing the obtained uniform mixed liquidinto a polytetrafluoroethylene reaction kettle to obtain a black mixture solution; and (3) centrifugally washing the mixture solution, and performing drying under a room temperature to obtain mixturepowder. The core-shell structure nanometer electrocatalyst with different metal in the interior and the exterior can be formed according to different reduction sequences of different metal, so that the quality activity and the area activity of the ternary core-shell structure electrocatalyst can be improved by dissolution of non-previous metal and a Kirkendall effect, and the stability and the oxidization-reduction performance of the ternary core-shell structure electrocatalyst are improved. The invention can provide the ternary core-shell structure nanometer electrocatalyst with excellent oxidization-reduction performance and having high industrial and commercial values.

Description

technical field [0001] The invention belongs to the technical field of chemical energy, and in particular relates to a ternary core-shell structure nano electrocatalyst material and a preparation method. Background technique [0002] In the past few decades, proton exchange fuel membrane cells have not been widely used commercially due to the scarcity and high price of platinum resources, the easy poisoning of catalysts, and the slow oxygen reduction kinetics of the cathode. At present, researchers generally adopt two methods to solve these problems: 1. Introduce transition metals into platinum catalysts to adjust the spacing of platinum atoms and change the electronic environment around platinum, thereby producing unique geometric effects and electronic effects, and improving electrocatalysts. catalytic activity. 2. Pt atoms are placed on the surface of the catalyst, thereby reducing the amount of Pt used. In real life, we can combine the two approaches to synthesize tern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B82Y30/00
CPCB82Y30/00H01M4/921H01M4/928Y02E60/50
Inventor 张丽娟付予张伶潇郭雨萌梁菊梅
Owner BEIJING UNIV OF TECH
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