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Pt-supported mesoporous polypyrrole nanoring catalyst and preparation method therefor

A technology of mesoporous polypyrrole nanometer and pyrrole nanometer, applied in electrochemical generators, fuel cells, electrical components, etc., can solve the problems of low activity and easy poisoning of platinum-carbon catalysts, achieve good anti-toxic performance and enhanced catalytic activity , the effect of enhancing the anti-toxic performance

Active Publication Date: 2017-08-18
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of mesoporous polypyrrole nano ring supported Pt catalyst material with high activity and good anti-toxic performance and its preparation method in view of the disadvantages of low activity and easy poisoning of platinum carbon catalysts for commercial methanol fuel cells

Method used

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  • Pt-supported mesoporous polypyrrole nanoring catalyst and preparation method therefor
  • Pt-supported mesoporous polypyrrole nanoring catalyst and preparation method therefor
  • Pt-supported mesoporous polypyrrole nanoring catalyst and preparation method therefor

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Embodiment 1

[0035] The preparation method of mesoporous polypyrrole nano ring supported Pt catalyst, the steps are as follows:

[0036] 1) Mix 9.0g of deionized water, 30.8mL of ammonia water and 160mL of absolute ethanol under magnetic stirring and set aside.

[0037] 2) Prepare 200 mL of an ethanol solution containing 17.5 g of tetraethyl orthosilicate (TEOS) and quickly add it to the solution prepared in step 1). After 12 hours of magnetic stirring at 25°C, a white emulsion was obtained.

[0038] 3) The white emulsion obtained in step 2) is centrifuged to obtain silica microspheres (ball diameter is 350nm), and the silica spheres are ultrasonically dispersed in deionized water to prepare silica sphere sol, silica The mass of the microspheres is 10% of the mass of the sol.

[0039] 4) Add 0.13g of pyrrole and 0.16g of sodium acetate in 5mL of water, then add 5mL of the silica microsphere sol prepared in step 3), and finally add 0.2mol L -1FeCl 3 10 mL of aqueous solution was used as...

Embodiment 2

[0045] The preparation method of the mesoporous polypyrrole nanoring-supported Pt catalyst has the same steps as in Example 1, except that the amount of TEOS in step 2) is 8.5 g, and the diameter of the prepared silica microspheres is 280 nm.

[0046] figure 2 Shown is the SEM picture of the mesoporous polypyrrole nanorings prepared in this example. It can be seen from the figure that the sample has a good ring structure and is uniformly dispersed. From the inset, it can be measured that the diameter of the inner ring of the sample is 280 nm, and the wall thickness is 60 nm. The inner diameter of the nanoring is consistent with the spherical diameter of the silica microspheres in the silica template.

Embodiment 3

[0048] The preparation method of the mesoporous polypyrrole nanoring-supported Pt catalyst has the same steps as in Example 1, except that the amount of TEOS in step 2) is 21.5 g, and the diameter of the prepared silica microspheres is 450 nm.

[0049] image 3 Shown is the TEM picture of the mesoporous polypyrrole nanorings prepared in this example. It can be seen from the figure that the sample has a good ring structure and is uniformly dispersed. From the enlarged view of a single polypyrrole nanoring in the inset, it can be seen that there are mesoporous structures in the pore walls.

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Abstract

The invention provides a Pt-supported mesoporous polypyrrole nanoring catalyst and a preparation method therefor. The composition of the catalyst comprises a polypyrrole material and supported Pt nano-particles, wherein the supported mass percentage of Pt is 20%-50%; the polypyrrole support material has a hierarchical porous structure, namely a nanoring structure with an inner diameter of 200-500 nm and a wall thickness of 30-60 nm, and a mesoporous structure with an aperture of 2-10 nm in walls of pores. The process of the catalyst is simple, and the prepared polypyrrole material has a bigger specific surface area than polypyrrole prepared by an electropolymerization method, which can be applied to fields like gas sensing, catalysis and separation.

Description

technical field [0001] The invention relates to a preparation method of a mesoporous polypyrrole nano ring-supported Pt nanoparticle catalyst, belonging to the technical field of Pt catalysts. Background technique [0002] With the increasing demand for energy, the world's energy crisis is becoming more and more serious. How to fully develop and utilize clean new energy, reduce and prevent environmental pollution and ecological damage has become a topic of human concern. Direct Methanol Fuel Cell (DMFC), due to its advantages of easy transportation and storage of fuel, light weight, small size, high energy density, high conversion efficiency and no pollution, has become an international new energy research field in recent years. hotspot. Although the research of DMFC has made remarkable progress in recent decades, the real large-scale commercial application has not yet been realized. One of the key technologies for the commercialization of DMFC is to develop high-performan...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/92H01M4/88H01M8/1011
CPCH01M4/8825H01M4/9008H01M4/925H01M8/1011Y02E60/50
Inventor 张程伟张政王道瑞殷福星
Owner HEBEI UNIV OF TECH
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