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Platinum-cobalt alloy catalyst with platinum-rich surface as well as preparation method and application of platinum-cobalt alloy catalyst

A technology of platinum-cobalt alloy and catalyst, which is applied in the field of platinum-cobalt alloy catalyst rich in surface and its preparation, which can solve the problems of many steps, difficulty in large-scale production, complex raw materials, etc., and achieve reduced consumption, cost optimization, and enhanced stability Effect

Active Publication Date: 2021-11-09
WUXI WEIFU HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the current preparation method reports, the raw materials used in the preparation process of most methods are complex, there are many steps, and it is not easy to scale up production

Method used

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  • Platinum-cobalt alloy catalyst with platinum-rich surface as well as preparation method and application of platinum-cobalt alloy catalyst
  • Platinum-cobalt alloy catalyst with platinum-rich surface as well as preparation method and application of platinum-cobalt alloy catalyst
  • Platinum-cobalt alloy catalyst with platinum-rich surface as well as preparation method and application of platinum-cobalt alloy catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing a surface-rich platinum-cobalt alloy catalyst, comprising the following steps:

[0032] (1) Disperse 5g of XC-72R carbon black in 100 mL of water, add 5mL of cobalt sulfate aqueous solution with a concentration of 100g / L, shear and disperse for 10min to form a uniform suspension; blow nitrogen to remove the oxygen in the slurry, add 1g of sodium carbonate , 1g sodium formate and an appropriate amount of sodium hydroxide solution with a concentration of 10g / L to adjust the pH value of the above suspension to 11, then add 22 mL of ethylene glycol solution with a concentration of 200g / L dinitrosodiammine platinum, and after ultrasonication for 240min , stirred at 80°C for 120 h to form a special carbon slurry;

[0033] (2) Press filter and wash the carbon slurry obtained in step (1), dry at 60°C for 6 hours to obtain a powder, and put the dried powder in a hydrogen-nitrogen mixed gas (the volume fraction of hydrogen is 5%) at 200°C After roasting fo...

Embodiment 2

[0038] A method for preparing a surface-rich platinum-cobalt alloy catalyst, comprising the following steps:

[0039] (1) Disperse 0.5g of Ketjen Black in 20mL of water, add 7.5mL of cobalt chloride aqueous solution with a concentration of 10g / L, and disperse for 10min to form a uniform suspension; pass nitrogen gas to remove the oxygen in the slurry, and add an appropriate amount of ammonia water (mass fraction 26%), 0.2g sodium hydroxide, and 5mL ethanol to adjust the pH value of the solution to 10.5, then add 40 mL ethylene glycol solution of chloroplatinic acid with a concentration of 10g / L, ultrasonicate for 30min, and stir at 90°C for 48h to form special carbon paste;

[0040] (2) Press filter and wash the carbon slurry obtained in step (1), dry at 80°C for 6 hours to obtain a powder, roast the dried powder at 250°C for 30 minutes under an argon atmosphere, and then roast at 650°C for 12 hours to obtain a solid powder;

[0041](3) Add 100mL of a mixed aqueous solution ...

Embodiment 3

[0044] A method for preparing a platinum-cobalt alloy catalyst with a platinum-rich surface. The difference between this embodiment and Example 1 is that 3 g of carbon nanotubes are weighed, and the specific surface area of ​​the carbon nanotubes is 800 m 2 / g, with a diameter of 5-20 nm. Other conditions are consistent with those in Example 1.

[0045] According to the manufacturing method of the single cell in Example 1, the platinum-cobalt alloy catalyst with a platinum-rich surface prepared in this example was made into a single cell, and the performance test was performed on the prepared single cell. The performance test conditions were the same as in Example 1.

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Abstract

The invention belongs to the technical field of fuel cell catalysts, and particularly relates to a platinum-cobalt alloy catalyst with a platinum-rich surface as well as a preparation method and application of the platinum-cobalt alloy catalyst. The preparation method of the platinum-cobalt alloy catalyst with the platinum-rich surface comprises the following steps of dispersing a carbon material in water, adding a cobalt raw material solution, performing shearing dispersion to form a uniform suspension, removing oxygen in the slurry, adjusting the pH value of the solution to 8-13, then adding a platinum raw material solution, and performing ultrasonic treatment to form special carbon slurry; carrying out filter pressing and washing on the obtained carbon slurry, drying to obtain solid powder, and roasting the dried powder to obtain solid powder; and finally, carrying out surface platinum-rich treatment, namely adding a treating fluid into the obtained solid powder, stirring, carrying out ultrasonic treatment, washing until the pH value of the filtrate is 2-7, and drying to obtain the platinum-cobalt alloy catalyst. According to the prepared platinum-cobalt alloy catalyst with the platinum-rich surface, the surface is subjected to platinum-rich treatment, so that the oxygen reduction performance of the catalyst is excellent, and the performance is remarkably improved when the platinum-cobalt alloy catalyst is applied to a fuel cell.

Description

technical field [0001] The invention belongs to the technical field of fuel cell catalysts, and in particular relates to a platinum-cobalt alloy catalyst with a platinum-rich surface and a preparation method and application thereof. Background technique [0002] In recent years, with economic development, the requirements for environmental protection have been increasing. For our scientific and technological workers in the energy field, we should devote ourselves to minimizing the pollution to the environment in the process of making full use of energy, so fuel cells are a very good direction. Fuel cells can directly convert chemical energy into electrical energy, especially proton exchange membrane fuel cells, and the reaction product is water without any pollution to the environment. The "core" material of the fuel cell is the catalyst, and the performance of the catalyst directly affects the performance of the fuel cell. [0003] Among fuel cell catalysts, platinum allo...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/92
CPCH01M4/8875H01M4/921Y02E60/50
Inventor 华秋茹张义煌张明陈杰李刚
Owner WUXI WEIFU HIGH TECH CO LTD
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