Preparation method of catalyst with core-shell structure for low-temperature fuel cell

A core-shell structure, fuel cell technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. Large, large catalyst particle size and other problems, to achieve the effect of easy control of reaction conditions, short production cycle, cost and performance

Inactive Publication Date: 2012-06-20
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent application document CN101890368A discloses a "preparation method of carbon-supported highly active gold or gold-platinum alloy or gold-core-platinum-shell structure nanocatalyst", that is, using a self-assembly method to modify porous carbon with π-π bonds of modified chemical reagents Obtain mercapto-functionalized carbon black as a carrier, and then deposit gold nanoparticles or gold-platinum alloy or gold-core-platinum-shell structure nanoparticles on the surface of mercapto-functionalized carbon black to obtain highly active gold or gold-platinum alloy Or gold-core-platinum-shell structure nano-carbon-supported catalysts, but this method ...

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  • Preparation method of catalyst with core-shell structure for low-temperature fuel cell
  • Preparation method of catalyst with core-shell structure for low-temperature fuel cell
  • Preparation method of catalyst with core-shell structure for low-temperature fuel cell

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Embodiment 1

[0044] The preparation of embodiment 1 PdPt / C catalyst

[0045] Add 180mg of sodium citrate into 15mL of ethylene glycol (EG) solution, stir with magnetic force, and sonicate for more than 0.5h to dissolve completely. Then add 2.15mL PdCl dropwise to the solution 2 / EG (PdCl 2 The mass concentration is 20mg / ml) solution, after ultrasonication and stirring to mix evenly, then add pretreated 100mg VulcanXC-72 carbon black, after ultrasonication, stirring and mixing evenly, use 5%KOH / EG solution to adjust the pH of the solution to 9. Finally, transfer the obtained liquid to a high-pressure reactor and react at 160°C for 8 hours; after the reaction, cool to room temperature, adjust the pH value to 5 with dilute nitric acid aqueous solution with a mass concentration of 5%, and then wash with secondary water to No Cl was detected in solution - Until then, dry it in vacuum at 70°C to constant weight to obtain the catalyst precursor, that is, the Pd / C core;

[0046] The catalyst...

Embodiment 2

[0049] The preparation of embodiment 2 RuPt / C catalyst

[0050] Add 296 mg of sodium citrate into a mixed solution of 40 mL of glycerol and water (the volume ratio of glycerol to water is 3:1), stir magnetically, and ultrasonically sonicate for 0.5 hours each to completely dissolve the sodium citrate; then pour into the solution Add 5.3 mL of RuCl dropwise 3 / H 2 O solution (RuCl 3 The mass concentration of 20mgmL -1 ), ultrasonically and stirred evenly, then added 300 mg of oxidized Vulcan XC-72 carbon black, ultrasonically, stirred evenly, and then mixed with 5%KOH / H 2 O solution to adjust the pH value of the solution to 9, transfer the resulting liquid to a high-pressure reactor, and react at 160°C for 12 hours; after the reaction is completed, wait to cool to room temperature, wash with secondary water and filter the reaction system until no more is detected in the filtrate Cl - So far, the resulting filter cake was vacuum-dried at 80°C to a constant weight to obtai...

Embodiment 3

[0061] The preparation of embodiment 3 RuPt / C catalyst

[0062] Add 296mg of sodium citrate into the mixed solution of 40mL of glycerol and water (the volume ratio of glycerol to water is 3:1), stir magnetically, and sonicate for 0.5h each, then add 5.3mL of RuCl dropwise to the solution 3 / H 2 O solution (RuCl 3 The mass concentration is 20mgmL -1 ). After ultrasonic and stirring to mix evenly, add 300mg VulcanXC-72 carbon black after oxidation treatment, after ultrasonic mixing evenly, use 5%KOH / H 2 O solution, adjust the pH value of the solution to 9, then transfer the resulting liquid to an autoclave, and react at 160°C for 12 hours; after the reaction, cool to room temperature, wash with secondary water and filter the reaction in the autoclave liquid until no Cl was detected in the filtrate - So far, the resulting filter cake was vacuum-dried at 70 °C to constant weight to obtain a catalyst precursor (ie Ru / C core).

[0063] The catalyst precursor (Ru / C core) prep...

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Abstract

The invention discloses a preparation method of a catalyst with a core-shell structure for a low-temperature fuel cell, belonging to the technical field of fuel cells. In the catalyst with the core-shell structure prepared with the preparation method, platinum is taken as a shell, a metal alloy consisting of more than one of metals including ruthenium, platinum, iron, cobalt, nickel, copper, tin, iridium, gold and silver is taken as an inner core, and the shell and the inner core are loaded on a carbon carrier. The preparation method comprises the following preparation steps of: reducing a metal chloride or a metal nitrate with a reducing agent, and forming a core on the carbon carrier with a large specific surface area; stabilizing the core; and precipitating Pt on a core layer with a impregnation reduction method, a high-pressure organic sol method, a microwave method or an electrodeposition process to form the catalyst with the core-shell structure. Due to the adoption of the preparation method, the utilization ratio of noble metal platinum is increased, the cost of an electro-catalyst is reduced effectively, and the methanol oxidizing capability and oxygen reducing activity of the obtained catalyst are increased by 10.8 times and 8.7 times in maximum respectively in comparison to the mass ratio and activity of a commercial JM4100Pt/C catalyst.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a method for preparing a core-shell structure catalyst used in low-temperature fuel cells. Background technique [0002] With the increasingly severe energy problems and environmental problems caused by burning coal and other fossil fuels, the research and development of hydrogen energy and fuel cells have been paid more and more attention by governments and scientific circles all over the world. Due to its rich and diverse fuel sources, high energy conversion efficiency, and low environmental impact (zero or low emission), fuel cells are considered to be a new energy technology that is most likely to replace existing energy on a large scale. It is one of the important technical means for energy problems and serious environmental pollution problems caused by burning fossil energy. In addition, low-temperature fuel cells in fuel cells are known as the most promising type of fuel cells f...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J23/46B01J23/89B01J35/02B01J37/34H01M4/92
CPCY02E60/50
Inventor 廖世军李月霞曾建皇江沿源
Owner SOUTH CHINA UNIV OF TECH
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