Mesoporous nanosphere with palladium-platinum yolk-eggshell structure for catalyzing methanol oxidation reaction and preparation method of mesoporous nanosphere

A methanol oxidation and palladium nanotechnology, applied in structural parts, electrochemical generators, fuel cells, etc., can solve the problems of unfavorable industrial production, high platinum consumption, poor catalytic performance, etc., and achieve excellent catalytic performance and stability, particle size The effect of uniform diameter and simple preparation method

Inactive Publication Date: 2020-06-12
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of high platinum consumption and relatively poor catalytic performance are not conducive to its industrial production.

Method used

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  • Mesoporous nanosphere with palladium-platinum yolk-eggshell structure for catalyzing methanol oxidation reaction and preparation method of mesoporous nanosphere
  • Mesoporous nanosphere with palladium-platinum yolk-eggshell structure for catalyzing methanol oxidation reaction and preparation method of mesoporous nanosphere
  • Mesoporous nanosphere with palladium-platinum yolk-eggshell structure for catalyzing methanol oxidation reaction and preparation method of mesoporous nanosphere

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A method for preparing a palladium@platinum egg yolk-eggshell structure mesoporous nanosphere methanol oxidation electrocatalyst, the method comprising the following steps:

[0045] 1) Potassium chloroplatinite, sodium chloropalladate and chloroauric acid solutions with a concentration of 20mM, ascorbic acid solution with a concentration of 0.1M, and cetyltrimethylammonium bromide solution with a mass fraction of 0.1%;

[0046] 2) Dissolve 20mg of F127 in 2mL of sodium chloropalladate solution, add 2mL of ascorbic acid solution, react in an oil bath at 95°C for 3 hours, add 2mL of hexadecyltrimethylammonium bromide solution, and continue the reaction for 1 hour, centrifuged to collect the product to obtain palladium nanoparticles, and the collected palladium nanoparticles were dispersed in 40mL of water for later use;

[0047] 3) Take 4 mL of palladium nanoparticle solution, disperse it in 20 mL of isopropanol and 65 μL of tetraethyl orthosilicate mixed solution, add 0....

Embodiment 2

[0053] A method for preparing a mesoporous platinum nanocage methanol oxidation electrocatalyst, the method comprising the steps of:

[0054] 1) Potassium chloroplatinite and chloroauric acid solutions with a concentration of 20mM, ascorbic acid solution with a concentration of 0.1M, and cetyltrimethylammonium bromide solution with a mass fraction of 0.1%;

[0055] 2) Mix 20 mL of isopropanol and 65 μL of tetraethyl orthosilicate evenly, add 0.5 mL of ammonia water, and stir vigorously at room temperature for 12 hours. After the reaction is completed, centrifuge and wash to obtain a silica precursor, and put the product at 50 ° C drying in an oven;

[0056] 3) Dissolve 0.05g of silica nanoparticles and 0.2mL of 3-aminopropyltrimethoxysilane in 10mL of isopropanol, heat the reaction at 80°C for 12 hours, and collect the product by centrifuging and washing at 50°C Dry under vacuum for 24 hours;

[0057] 4) Weigh 2 mg of 3-aminopropyltrimethoxysilane-modified silica nanoparticl...

Embodiment 3

[0061] A method for preparing a palladium@platinum egg yolk-eggshell structure mesoporous nanosphere methanol oxidation electrocatalyst, the method comprising the following steps:

[0062] 1) Potassium chloroplatinite, sodium chloropalladate and chloroauric acid solutions with a concentration of 5mM, ascorbic acid solution with a concentration of 0.02M, and cetyltrimethylammonium bromide solution with a mass fraction of 0.02%;

[0063] 2) Dissolve 5mg of F127 in 1mL of sodium chloropalladate solution, add 1mL of ascorbic acid solution, react in an oil bath at 50°C for 1 hour, add 1mL of hexadecyltrimethylammonium bromide solution, and continue the reaction for 0.5 hours , the product was collected by centrifugation to obtain palladium nanoparticles, and the collected palladium nanoparticles were redispersed in 10 mL of water for later use;

[0064] 3) Take 1 mL of palladium nanoparticle solution, disperse it in 10 mL of isopropanol and 10 μL of tetraethyl orthosilicate mixed s...

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Abstract

The invention discloses a methanol oxidation electrocatalyst with a palladium-platinum yolk-eggshell structure and a preparation method. The preparation method comprises the following steps: reducingsodium chloropalladate with ascorbic acid to prepare palladium nanoparticles; preparing a palladium-silicon dioxide precursor; carrying out amination treatment on the palladium-silicon dioxide precursor by using 3-aminopropyltrimethoxysilane; weighing 1-6mg of 3-palladium-silicon dioxide nanoparticles and dissolving the 3-palladium-silicon dioxide nanoparticles into a mixed solution of potassium chloroplatinate and chloroauric acid, wherein the total volume of the mixed solution is 2mL; adding 10-50mg of F127, mixing, then adding 1-6mL of ascorbic acid solution, carrying out ultrasonic reaction for 1-5 hours at 20-50 DEG C, washing and centrifuging after the reaction is finished to obtain nanoparticles with a palladium-silicon dioxide-mesoporous platinum three-layer structure, and etchingsilicon dioxide from the product by using 10-50mL of hydrofluoric acid solution; washing and centrifuging to obtain a final product. The preparation process is flexible, the reaction conditions are mild, and the prepared material has excellent electro-catalytic methanol oxidation performance.

Description

[0001] (1) Technical field [0002] The invention relates to a palladium@platinum egg yolk-eggshell structure mesoporous nanosphere that catalyzes methanol oxidation and a preparation method thereof. The catalyst can be used for research on electrochemically catalyzing methanol oxidation. [0003] (2) Background technology [0004] Direct methanol fuel cells (DMFCs) are highly efficient energy conversion devices and have attracted widespread attention especially for their potential applications in portable electronic devices and electric vehicles. Improving the kinetics of the anode reaction (ie methanol oxidation reaction) of methanol fuel cells is the key to promote the development of fuel cells. Platinum-based materials have good catalytic performance for direct methanol fuel cells. However, due to the limited reserves of precious metal platinum, its widespread application is limited. Although there are many studies on platinum alternative materials, their catalytic perfor...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/92H01M4/88H01M8/1011
CPCH01M4/8825H01M4/9058H01M4/92H01M4/921H01M8/1011Y02E60/50
Inventor 王亮李春洁王自强许友王鸿静
Owner ZHEJIANG UNIV OF TECH
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