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Method for chemically plating cobalt on surface of graphite matrix

An electroless plating and substrate technology, applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve the problems of expensive catalyst, unsatisfactory catalytic effect, and inability to completely solve the problem, achieving high production efficiency and easy operation The effect of convenience and simple equipment

Active Publication Date: 2013-01-23
菏泽建数智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Behind the attention of direct methanol fuel cells, there are still a series of problems that cannot be completely solved
Its catalyst is expensive, and its catalytic effect is not ideal, which is one of the main reasons for its development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The sample matrix is ​​block graphite with a size of 22×14×2.5mm cuboid. The specific operation steps are:

[0037] 1. Mechanical pretreatment of the sample substrate: the surface is polished with sandpaper to make the graphite surface as rough as possible.

[0038] 2. Degreasing: Weigh 4g of NaOH, add deionized water to 50ml, and stir evenly in a magnetic stirrer to prepare an 80g / L NaOH solution. Wash at 40°C for 3 hours with ultrasonic waves at a frequency of 40kHz. After degreasing, wash with deionized water and observe whether there is evenly covered water film on the surface, no water droplets or water film rupture, if there are water droplets or water film rupture on the graphite surface, it needs to be reprocessed. Then rinse with deionized water until neutral.

[0039] 3. Coarsening: use 68% HNO 3 The solution was cleaned at 25°C for 2 hours under 40kHz frequency ultrasonic waves, and left to stand for 24 hours. Then rinse with deionized water until neutral...

Embodiment 2

[0047] Prepare a graphite substrate with electroless cobalt plating on the surface according to the method of Example 1, the difference is that the process parameters in step 8 are: standing in the plating solution for 15s.

[0048] The samples were tested according to the method of Example 1. The results show that its oxidation peak potential for methanol in acidic medium is 0.55V, and the peak current is 9.14e -4 a.

Embodiment 3

[0050] According to the method of example 1, prepare the graphite substrate of electroless cobalt plating on the surface, the difference is: the process parameter in the step 8 is: stand still in the plating solution for 80s.

[0051]The samples were tested according to the method of Example 1. The results show that its oxidation peak potential for methanol in acidic medium is 0.51V, and the peak current is 1.43e -3 a.

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PUM

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Abstract

The invention discloses a method for chemically plating cobalt on the surface of a graphite matrix, comprising the following steps of: sequentially carrying out oil removing with alkali liquor, coarsing with acid liquor, sensitizing with a sensitizing solution, activating with an activating solution and reducing with a reducing solution on the graphite matrix to obtain a pretreated graphite matrix; immersing the pretreated graphite matrix into a chemical cobalt plating solution at the temperature of 80-90 DEG C, standing and reacting for 15-120 seconds, and cleaning the graphite matrix to be neutral with deionized water after the graphite matrix is taken out, thus the graphite matrix the surface of which is chemically plated with cobalt is obtained. In the invention, the adopted equipmentis simple, the operation is easy, the production efficiency is high, the size of cobalt particles can be simply controlled by controlling the time of chemical plating, and the raw material is available, thus the method is applicable to industrialized production.

Description

(1) Technical field [0001] The invention relates to a process method of electroless plating, in particular to a process method of electroless cobalt plating on a graphite substrate. (2) Background technology [0002] Behind the attention of direct methanol fuel cells, there are still a series of problems that cannot be completely solved. Its catalyst is expensive, and its catalytic effect is not ideal, which is one of the main reasons for its development. Experiments have proved that the addition of Co can effectively reduce the catalyst price and obtain better catalytic performance to a certain extent. Electroless plating has the advantages of simple operation and easy control. The coating thickness is very uniform, and the dispersion force of the plating solution can be close to 100%, especially suitable for substrates with complex shapes. It can make the catalyst on the surface of the electrode evenly distributed, and there is no local overheating phenomenon caused by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/31C23C18/18
Inventor 楼白杨杨京
Owner 菏泽建数智能科技有限公司