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Method of increasing fuel cell catalyst stability

A fuel cell and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., can solve the problems of restricting large-scale production, complex catalyst preparation methods, and high production costs, and is suitable for large-scale production. The effect of novel structure and low cost

Inactive Publication Date: 2008-07-30
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So as to solve the problems of complex preparation methods of fuel cell catalysts, high production costs, and restrictions on large-scale production

Method used

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  • Method of increasing fuel cell catalyst stability
  • Method of increasing fuel cell catalyst stability
  • Method of increasing fuel cell catalyst stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Place about 200g of commercial carbon powder material Vulcan XC-72 in a high temperature resistant graphite crucible, and put the graphite crucible into an intermediate frequency induction high temperature graphitization furnace for graphitization. Its temperature selection is 1800 ℃. The treatment process is as follows: first evacuate to about 10Pa, then power on to raise the temperature, use manual heating, stop vacuuming when the temperature reaches the holding temperature, and fill the furnace with high-purity Ar gas until the pressure in the furnace is 0.09MPa. And after the end point temperature was constant for 0.5 hours, the sample was cooled to room temperature with the furnace. Using the carbon material as a carrier, a Pt / C catalyst was prepared by a direct reduction method. Figure 1 is the XRD comparison chart of the graphitized carbon carrier and the original carbon powder in this example, and Figure 2 is the cyclic voltammogram of the prepared catalyst.

Embodiment 2

[0028] Place about 200g of commercial carbon powder material Vulcan XC-72 in a high temperature resistant graphite crucible, and put the graphite crucible into an intermediate frequency induction high temperature graphitization furnace for graphitization. Its temperature selection is 2100 ℃. The treatment process is as follows: when the heat preservation temperature is equal to or higher than 2000°C, first evacuate to about 10Pa, then power on to raise the temperature, use manual heating, heat up to 2000°C for 0.5 hours first, stop vacuuming, and fill Ar gas to the pressure in the furnace to 0.09MPa, continue to heat up to the holding temperature of 2100°C. And after the end point temperature was constant for 0.5 hours, the sample was cooled to room temperature with the furnace. Soak the obtained material in 5.0% dilute sulfuric acid for 12 hours, filter and dry. The Pt / C catalyst was prepared by the ethylene glycol reduction method with the dried carbon material as the carr...

Embodiment 3

[0030] Place about 200g of commercial carbon powder material Vulcan XC-72 in a high temperature resistant graphite crucible, and put the graphite crucible into an intermediate frequency induction high temperature graphitization furnace for graphitization. Its temperature selection is 2100 ℃. The treatment process is as follows: when the holding temperature is equal to or higher than 2000°C, first vacuumize to about 10Pa, then power on to raise the temperature, use manual heating, heat up to 2000°C for 0.5 hours first, stop vacuuming, and fill the furnace with nitrogen until the pressure in the furnace is 0.09MPa, continue to heat up to the holding temperature of 2100°C. And after the end point temperature was constant for 3 hours, the sample was cooled to room temperature with the furnace. The obtained material was soaked in 5.0% dilute hydrochloric acid for 12 hours, filtered and dried. The Pt / C catalyst was prepared by the direct reduction method with the dried carbon mate...

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Abstract

The invention discloses a technology used for improving the stability of catalysts in the fuel cell industry; in particular to a process for preparing novel catalysts through graphitize treatment of carbon carriers. The preparation process of the invention, under the protection of inert gas with high-purity, carries out high-temperature heat treatment to common commercial carbon carriers to cause carrier materials to be partially graphitized and eliminate partial impurities in the original supporters, thus improving the stable properties of the high carbon carriers. Furthermore, the graphitized materials are carried out acidification treatment and a direct-reduction process or an ethylene glycol reduction process is adopted to prepare the catalysts in order to improve the stability of fuel cell catalysts. The invention is characterized by new structure, simple technique conditions, lower cost, being relatively suitable for scale production, etc. Hence, the invention belongs to a method that integrates economical efficiency and practicability into a whole and improves the stability of the fuel cell catalysts.

Description

technical field [0001] The invention relates to a technology for improving catalyst stability in the fuel cell industry, in particular to a method for graphitizing a catalyst carbon carrier and preparing a novel catalyst. Background technique [0002] At present, the service life of electrodes in fuel cell electric vehicles is about 2000 hours. The low stability of the catalyst and the performance degradation after long-term operation are the key factors restricting its service life. The commonly used catalyst is carbon-supported platinum (Pt / C) material, and the corrosion of carbon support is one of the important factors affecting the stability of the catalyst. The corrosion of carbon support can lead to the shedding and loss of Pt particles, and aggravate the agglomeration and migration of Pt, which will cause the decrease of the electrochemical surface area of ​​the catalyst, resulting in the loss of battery performance. Therefore, the carbon support plays an important r...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J21/18H01M4/92
CPCY02E60/50
Inventor 侯中军罗璇衣宝廉林治银明平文
Owner SUNRISE POWER CO LTD
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