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Preparation method of ordered mesoporous carbon-tungsten coating for proton exchange membrane fuel cell stainless steel bipolar plate protection

A proton exchange membrane, fuel cell technology, applied in fuel cell parts, battery electrodes, metal material coating process, etc. , the effect of high degree of graphitization

Active Publication Date: 2013-03-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the corrosion resistance and conductivity of the bipolar plate are improved by the above method, after a period of operation, the coating is easy to fall off due to the difference in thermal expansion coefficient, and the passivation behavior of the metal bipolar plate is destroyed due to the potential difference between them. , may accelerate the occurrence of corrosion

Method used

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  • Preparation method of ordered mesoporous carbon-tungsten coating for proton exchange membrane fuel cell stainless steel bipolar plate protection
  • Preparation method of ordered mesoporous carbon-tungsten coating for proton exchange membrane fuel cell stainless steel bipolar plate protection
  • Preparation method of ordered mesoporous carbon-tungsten coating for proton exchange membrane fuel cell stainless steel bipolar plate protection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Dissolve 1 g of polyoxyethylene / polyoxypropylene / polyoxyethylene amphiphilic block copolymer F127 (purchased from Sigma-Aldrich) in 15.0 ml of absolute ethanol, and stir for 1 h to form a transparent solution A; At the same time, add 0.025 g of silicotungstic acid into 5 ml of absolute ethanol, and stir magnetically to obtain solution B; slowly add 5 g of ethanol solution of phenolic resin (mass fraction of phenolic resin 20%) in solution A, and stir for 10 min; then Add solution B to solution A drop by drop, stir for 1 h to mix evenly, so as to obtain light yellow transparent carbon-tungsten solution;

[0040] (2) Add the previously prepared carbon-tungsten solution on the stainless steel sheet drop by drop on the desktop glue homogenizer. s, the glue homogenization time is 60 s, repeat the glue dropping and glue homogenization process 5 times;

[0041] (3) The stainless steel sheet coated with the solution was transferred to an oven, the solvent was evaporated at...

Embodiment 2

[0045] In this example, except that the dosage of silicotungstic acid was changed to 0.05g, the dispensing speed was selected as 800 rpm / s, the dispensing time was 10 s, the dispensing speed was selected as 3000 rpm, the dispensing time was 45 s, and the temperature was kept at 350 °C for 4 h ; All the other contents are the same as in Example 1.

[0046] The CW-0.05-500 coating is obtained, the metal tungsten salt forms nano-short rods during the carbonization process, and is highly dispersed in the carbon matrix, which ensures that the ordered mesoporous structure of the coating is not destroyed (see figure 1 -a and image 3 -b), see Table 1 for specific structural data. at 0.5 M H 2 SO 4 The data of the Tafel test under the system are shown in Table 2. It can be seen from Table 2 that compared with the uncoated 304 stainless steel, the self-corrosion potential of the CW-0.05-500 coating is positively shifted by about 500 mV, the corrosion current density is reduced by ...

Embodiment 3

[0048] In this example, except that the dosage of silicotungstic acid is changed to 0.1g, the glue dropping speed is selected as 500 rpm, and the temperature is kept at 350°C for 5 hours; the rest of the content is the same as that of Example 1.

[0049] To obtain CW-0.1-500 coating, the metal tungsten salt forms nanorods during carbonization and is highly dispersed in the carbon matrix, which ensures that the ordered mesoporous structure of the coating is not destroyed (see figure 1 -a and image 3 -c), see Table 1 for specific structural data. at 0.5 M H 2 SO 4 The data of the Tafel test under the system are shown in Table 2. It can be seen from Table 2 that compared with the uncoated 304 stainless steel, the self-corrosion potential of the CW-0.1-500 coating is positively shifted by about 500 mV, the corrosion current density decreases by two orders of magnitude.

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Abstract

The invention relates to a preparation method of an ordered mesoporous carbon-tungsten coating for proton exchange membrane fuel cell stainless steel bipolar plate protection. The preparation method comprises the following steps: dissolving a surfactant in absolute alcohol, and stirring; adding a phenol formaldehyde resin ethanol solution in a dropwise manner, and uniformly stirring to provide a spare use; dissolving silicotungstic acid in absolute alcohol, and stirring to obtain a solution to provide a spare use; uniformly mixing the two solutions to obtain a transparent yellowish carbon-tungsten solution; adding the carbon-tungsten solution on a stainless steel sheet in a dropwise manner drop-to-drop, and carrying out treatments such as glue adding in a dropwise manner and glue uniformization; carrying out solvent evaporation on the solution-coated stainless steel sheet for at least 8 h at a temperature of 25 DEG C, and then carrying out thermal polymerization for at least 24 h at a temperature of 70-120 DEG C to form a yellowish coating on the surface of the stainless steel; and finally carrying out carbonization to obtain the black ordered mesoporous carbon-tungsten coating. According to the preparation method, the ordered mesoporous carbon-tungsten electric conduction coating is formed on the surface of the stainless steel bipolar plate so as to protect stability of a passivation film, inhibit anode dissolution of the stainless steel bipolar plate, and improve output power and a service life of a proton exchange membrane fuel cell.

Description

technical field [0001] The invention relates to a method for preparing a protective coating for a stainless steel bipolar plate, in particular to a method for preparing an ordered mesoporous carbon-tungsten coating used for the protection of a stainless steel bipolar plate in a proton exchange membrane fuel cell. Background technique [0002] The metal bipolar plate of proton exchange membrane fuel cell (PEMFC) thickens the passivation film due to polarization, which increases the ohmic pressure drop of the battery, and at the same time, the metal ions dissolved in a small amount at the electrode pollute the membrane electrode assembly (especially the proton exchange membrane and catalyst), which greatly affects the overall efficiency of PEMFC. For this reason, a variety of surface modification methods have been tried at home and abroad to form a protective coating on the surface of the metal bipolar plate, so that the contact resistance of the PEMFC electrode remains basica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C26/00H01M8/02H01M4/88H01M4/94
CPCY02E60/50Y02P70/50
Inventor 王涛何建平汤静孙新郭虎郭云霞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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