Fuel cell catalyst with function of guiding protons, and prepartion method

A technology of fuel cells and catalysts, which is applied in the directions of catalyst activation/preparation, catalyst carriers, chemical instruments and methods, etc., to achieve the effect of improving catalytic efficiency and improving durability

Inactive Publication Date: 2007-02-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is no relevant literature report on this type of catalyst

Method used

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  • Fuel cell catalyst with function of guiding protons, and prepartion method
  • Fuel cell catalyst with function of guiding protons, and prepartion method
  • Fuel cell catalyst with function of guiding protons, and prepartion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 2 ml of Nafion solution with a mass concentration of 5% and add it to a mixture of ethanol and water with a mass ratio of 0.5:1, stir for 5 to 10 minutes, then add 32 mg of platinum in H 2 PtCl 6 The solution continued to stir, and the pH of the solution was adjusted to 8 with NaOH, and heated to reflux at 90° C., the solution gradually turned from light yellow to black, and finally dark black, and a stable Pt-containing colloidal solution was obtained. Then weigh 80 mg of carrier XC-72 (the specific surface area is 250 square meters per gram), fully disperse it with the above ethanol and water mixture, add it to the Pt-containing colloid solution, and continue stirring for 3 to 5 hours to obtain Nafion-modified Pt / C catalyst. Among them, the average particle size of Pt particles is 2 nanometers, and the dispersibility is very good.

[0034] Preparation of fuel cell core chip CCM: Add the prepared catalyst to the mixture of deionized water and perfluorosulfonic a...

Embodiment 2

[0037] Take 3 ml of SPEEK solution with a mass concentration of 5%, add it to a mixture of ethanol and water with a mass ratio of 100:1, stir for 5 to 10 minutes, then add 60 mg of platinum in H 2 PtCl 6 The solution continued to stir, and the pH of the solution was adjusted to 13 with NaOH, and heated to reflux at 90° C., the solution gradually turned from light yellow to black, and finally dark black, and a stable Pt-containing colloidal solution was obtained. Then weigh 90 mg of carrier mesoporous carbon microspheres with a pore diameter of 3 to 6 nanometers, fully disperse them with the above ethanol and water mixture, add them to the Pt-containing colloid solution, and continue to stir for 3 to 5 hours to obtain SPEEK-modified Pt / C catalyst. Among them, the average particle diameter of Pt particles is 3.5 nanometers, and the dispersibility is very good. The preparation process of the fuel cell core chip CCM, single cell assembly and test conditions are the same as those...

Embodiment 3

[0039] Take 10 ml of sulfonated polystyrene resin solution with a mass concentration of 5%, add it to a mixture of methanol and water with a mass ratio of 10:1, stir for 5 to 10 minutes, then add 32 mg of platinum in H 2 PtCl 6 The solution continued to stir, and the pH of the solution was adjusted to 8 with NaOH, and heated to reflux at 100° C., the solution gradually turned from light yellow to black, and finally dark black, and a stable Pt-containing colloidal solution was obtained. Then weigh 80 mg of carrier nano-graphite balls, the particle size of which is 40-55 nanometers, fully disperse with the above-mentioned methanol and water mixture, add to the Pt-containing colloidal solution, and continue to stir for 3-5 hours to obtain sulfonated Polystyrene resin modified Pt / C catalyst. Among them, the average particle size of the Pt particles is 3 nanometers, and the dispersibility is very good. The preparation process of the fuel cell core chip CCM, single cell assembly a...

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Abstract

Nano fine particles of noble metal in catalyst are modified by high polymer of guiding protons. Inductive the said high polymer can increase steric hindrance of fine particles of noble metal in order to anchor fine particles of noble metal in catalyst on surface of carrier so as to raise use ratio of catalyst. Farther, the high polymer of guiding protons is a better bonding agent also. Better binding force is existed between Nano fine particles of noble metal modified by the high polymer and carrier. The synthesized catalyst possesses function of guiding protons. The method for preparing the catalyst includes steps: preparing colloid of Nano noble metal modified by the said high polymer in advance; then, depositing the prepared colloid on carbon carrier. Average particle diameter of noble metal in catalyst is 2-5 Nano, and diameters are distributed evenly. Battery produced from the catalyst possesses better performance of electric output.

Description

technical field [0001] The invention relates to a catalyst in the field of fuel cells, in particular to a fuel cell catalyst with the function of conducting protons. It is characterized in that the catalyst nano precious metal particles are modified by proton-conducting polymers. The invention also relates to a preparation method of the catalyst. Background technique [0002] As a new type of energy, proton exchange membrane fuel cell (PEM Fuel Cell) has the advantages of low operating temperature, no pollution, high specific power, and rapid start-up. . Fuel cells use the precious metal platinum or platinum alloy catalysts. Platinum is a rare metal with scarce resources and high prices. Therefore, improving the utilization rate of Pt and reducing the loading of Pt are an important part of reducing the cost of fuel cells. At present, carbon black is generally used as a carrier of Pt, because carbon black has a high specific surface area, which is beneficial to improve t...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/92B01J23/38B01J31/02B01J32/00B01J37/00
CPCY02E60/50
Inventor 木士春程年才潘牧袁润章
Owner WUHAN UNIV OF TECH
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