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Hollow spherical mesoporous PtAu nanomaterial and preparation method and application thereof

A technology of hollow spherical and nano-materials, applied in the field of materials, can solve the problems of slow oxidation of methanol and limit the development of methanol fuel cells, etc., and achieve the effects of good carrier stability, realization of preparation methods, and simple and easy operation

Active Publication Date: 2017-07-07
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem facing the application and development of methanol fuel cells is the slow oxidation rate of methanol on the anode catalyst, which seriously limits the development of methanol fuel cells. Therefore, solving the problem of anode catalysts has attracted extensive research attention

Method used

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  • Hollow spherical mesoporous PtAu nanomaterial and preparation method and application thereof
  • Hollow spherical mesoporous PtAu nanomaterial and preparation method and application thereof
  • Hollow spherical mesoporous PtAu nanomaterial and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 1)

[0055] Preparation of PEI-modified polystyrene spherical template with a particle size of 260nm:

[0056] Add 1mL of 2mM aqueous solution of polystyrene microspheres into 0.5% polyethyleneimine (PEI) aqueous solution and mechanically stir for 50min, then centrifuge 3 times at a speed of 9000rpm, each centrifugation time is 25min. Redisperse in water for later use.

[0057] Preparation of gold sol-modified template dispersion:

[0058] Mix the aqueous solution of PEI-modified template agent microspheres with the nano-gold sol obtained above at a volume ratio of 1:5, stir for 20 minutes, and centrifuge 3 times at a speed of 4000 rpm, and the time of each centrifugation is 10 minutes. Nano gold sol modified template dispersion PS@Au seeds.

[0059] 2)

[0060] React with an aqueous solution of chloroauric acid, a growth solution containing a gold source:

[0061] Add 2 mL of template dispersion liquid PS@Au seeds modified by nano-gold sol obtained in step 2) into 2...

Embodiment 2

[0067] Embodiment 2, electrocatalytic methanol oxidation test

[0068] Take 5 μL of the hollow spherical nanomaterial dispersion (2mg / mL) obtained in Example 1 with a pipette and drop-coat it on the surface of a clean glassy carbon electrode. After drying, take 5 μL and apply nafion ethanol solution (0.5%) drop-coated on the electrode surface. The glassy carbon electrode modified by the hollow spherical nanomaterial is obtained, which is dried and used for later use.

[0069] A conventional three-electrode system was used to test the electrocatalytic performance of the hollow spherical nanomaterial obtained in Example 1. The glassy carbon electrode modified by the hollow spherical nanomaterial was used as a working electrode, the platinum wire electrode was used as a counter electrode, and the saturated KCL silver / silver chloride electrode was used as a reference. Electrodes, the test temperature is 25°C. The composition of the electrolyte is 0.5M sulfuric acid solution, and ...

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Abstract

The invention discloses a hollow spherical mesoporous PtAu dual-metal methanol fuel cell catalyst nanomaterial and a preparation method thereof. The hollow spherical nanometer comprises hollow spheres formed by a shell layer; the inner surface of the shell layer is formed by gold while the outer surface of the shell layer is formed by platinum; the shell layer adopts a continuous porous structure; the shell layer is 5-200nm in thickness; the holes are 1-15nm in diameter; the hollow spherical nanometer is 50-2,000nm in grain diameter; and the atomic ratio of gold to platinum in the shell layer is (0.1-9.9) to 1. A dual-metal shell layer is formed on a temperate through a template method via a seed growth method to prepare the core-shell structure; and then the template is removed by adopting a solvent to form the hollow dual-metal shell layer. According to the method disclosed by the invention, the catalyst structure can be realized by controlling preparation conditions in each step, so that accurate regulation and control on appearance and compositions, and simple and easy implementation of the operation are achieved.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a hollow spherical mesoporous PtAu nanometer material and a preparation method and application thereof. Background technique [0002] A methanol fuel cell is a power generation device that directly converts methanol as a fuel into electrical energy. Compared with traditional fossil fuel-based internal combustion engine equipment, methanol fuel cells have higher energy efficiency and are cleaner and more environmentally friendly, so they have received extensive attention. The problem facing the application and development of methanol fuel cells is the slow oxidation rate of methanol on the anode catalyst, which severely limits the development of methanol fuel cells. Therefore, solving the problem of anode catalysts has attracted extensive research attention. Pt has been widely studied due to its high methanol catalytic oxidation activity, but how to improve the efficiency, stability and du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/88H01M4/926Y02E60/50
Inventor 江龙王海飞鲁闻生张建平
Owner INST OF CHEM CHINESE ACAD OF SCI
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