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PtAg nanocrystal with porous double hollow sphere structure, preparation method and application thereof

A technology of nanocrystals and nanocrystal materials, applied in the field of Pt-based alloy nanocrystals, can solve problems such as unstable structures and few active sites, and achieve the effects of reducing energy consumption, simple preparation methods, and simple operations

Inactive Publication Date: 2020-02-28
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing porous Pt-based catalysts also have some defects, such as few active sites and unstable structures.

Method used

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  • PtAg nanocrystal with porous double hollow sphere structure, preparation method and application thereof
  • PtAg nanocrystal with porous double hollow sphere structure, preparation method and application thereof
  • PtAg nanocrystal with porous double hollow sphere structure, preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0035] A preparation method of porous double hollow sphere PtAg nanocrystals, comprising the following steps:

[0036] 1) Preparation of reaction solution: 8 mL of water was used as solvent, and 0.75 mL of 0.05M H 2 PtCl 6 aqueous solution with 0.25mL 0.05M AgNO 3 After the aqueous solution is mixed, it is fully ultrasonicated to make it uniform, and then 10mL (10mg / mL) N'N-methylenebisacrylamide is added, and ultrasonically mixed evenly.

[0037] 2) Preparation of porous double hollow sphere PtAg nanocrystals: put the above reaction solution in an oven at 160°C for 4 hours, after cooling to room temperature, centrifuge the obtained black precipitate at 10,000 rpm for 5 minutes, and wash it with ethanol four times. The porous double hollow sphere PtAg nanocrystals are obtained.

Embodiment 2

[0039] A preparation method of porous double hollow sphere PtAg nanocrystals, comprising the following steps:

[0040] 1) Preparation of reaction solution: 8 mL of water was used as solvent, and 0.75 mL of 0.05M H 2 PtCl 6 aqueous solution with 0.25mL 0.05M AgNO 3 After the aqueous solution is mixed, it is fully ultrasonicated to make it uniform, and then 1 mL (10 mg / mL) N’N-methylenebisacrylamide is added, and ultrasonically mixed evenly.

[0041] 2) Preparation of porous double hollow sphere PtAg nanocrystals: put the above reaction solution in an oven at 160°C for 4 hours, after cooling to room temperature, centrifuge the obtained black precipitate at 10,000 rpm for 5 minutes, and wash it with ethanol four times. The porous double hollow sphere PtAg nanocrystals are obtained.

Embodiment 3

[0043] A kind of preparation method of the preparation method of porous double hollow sphere PtAg nano crystal, comprises the following steps:

[0044]1) Preparation of reaction solution: 8 mL of water was used as solvent, and 0.75 mL of 0.05M H 2 PtCl 6 aqueous solution with 0.25mL 0.05M AgNO 3 After the aqueous solution is mixed, it is fully ultrasonicated to make it evenly mixed, and then 10mL (100mg / mL) N’N-methylenebisacrylamide is added, and ultrasonically mixed evenly.

[0045] 2) Preparation of porous double hollow sphere PtAg nanocrystals: put the above reaction solution in an oven at 160°C for 4 hours, after cooling to room temperature, centrifuge the obtained black precipitate at 10,000 rpm for 5 minutes, and wash it with ethanol four times. The porous double hollow sphere PtAg nanocrystals are obtained.

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PUM

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Abstract

The invention discloses a PtAg nanocrystal with a porous double hollow sphere structure, a preparation method thereof, and application of the material as a methanol oxidation anode catalyst. The preparation method comprises the following steps: taking Pt salt and Ag salt as metal precursors, taking N'N-methylenebisacrylamide as a structure-directing agent, adding a reducing agent and performing aone-step hydrothermal reaction to obtain the PtAg nanocrystals. The method of the invention has mild conditions and high yield, is green and pollution-free, and is suitable for commercial production.As a methanol oxidation anode catalyst, the obtained porous double hollow sphere PtAg nanocrystals have the advantages of excellent electrocatalytic activity, stability and the like.

Description

technical field [0001] The invention relates to a method for preparing PtAg nanocrystals with a porous double hollow sphere structure, a material obtained therefrom, and an application of the material as an anode catalyst for methanol oxidation, belonging to the technical field of Pt-based alloy nanocrystals. Background technique [0002] Proton exchange membrane fuel cell (Proton Electrolyte Membrane Fuel Cell, PEMFC) is a new energy device with great application prospects in the 21st century. In addition to the general advantages of fuel cells, such as high power generation efficiency and less environmental pollution, PEMFC can also be used in It has the advantages of quick start at room temperature, no electrolyte loss, high specific power and long life. However, because the key materials and key technologies of PEMFC still need further breakthroughs, and the cost needs to be greatly reduced, it cannot be further commercialized. The catalyst is the key reason for the hig...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88H01M8/1011
CPCH01M4/921H01M4/88H01M8/1011Y02E60/50Y02P70/50
Inventor 唐亚文姚文清李玉莲
Owner NANJING NORMAL UNIVERSITY
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