Method for preparing cathode catalyst of proton exchange membrane fuel cell

A fuel cell cathode and proton exchange membrane technology, applied in catalyst activation/preparation, battery electrodes, chemical instruments and methods, etc., can solve the problems of high temperature, complicated procedures, cumbersome processes, etc., and achieve simple operation, low preparation cost, The effect of improving the reducing activity

Inactive Publication Date: 2009-10-21
UNIV OF SCI & TECH BEIJING
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The temperature is high, the process is c

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  • Method for preparing cathode catalyst of proton exchange membrane fuel cell
  • Method for preparing cathode catalyst of proton exchange membrane fuel cell
  • Method for preparing cathode catalyst of proton exchange membrane fuel cell

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[0026] Example 1:

[0027] Heat the carbon nanotubes at 800°C in advance for 20 minutes; mix 6 ml of ethylene glycol and 9 ml of water to prepare 15 ml of organic solvent, then add 18 mg of pretreated carbon nanotubes to the organic solvent, and ultrasonically disperse for 30 minutes. Carbon slurry; Measure 3.0 ml of chloroplatinic acid solution (5 mg platinum / ml) mixed with organic solvent, add dropwise to the carbon slurry, and ultrasonically disperse for 30 minutes to form a mixed suspension. Add under stirring with argon 5ml of sodium hydroxide solution mixed with organic solvent with a concentration of 1.0 mol / L, adjust the pH to 10, raise the temperature to 70°C, dropwise add 18 ml of formic acid solution with a concentration of 0.75 mol / L mixed with organic solvent, continue Stir for 12 hours, then lower the temperature to 50°C. The final product was washed with deionized water until there was no chloride ion in the washing liquid, and dried under vacuum at 90°C for 12 hour...

Example Embodiment

[0028] Example 2:

[0029] Heat the carbon nanotubes at 500°C for 60 minutes in advance; mix 10 ml of ethylene glycol and 10 ml of water to prepare 20 ml of organic solvent, then add 20 mg of pretreated carbon nanotubes to the organic solvent, and ultrasonically disperse for 60 minutes. Carbon slurry; Measure 2.0 ml of chloroplatinic acid solution (7.5 mg platinum / ml) mixed with organic solvent, add dropwise to the carbon slurry, and ultrasonically disperse for 60 minutes to form a mixed suspension. Add under stirring with argon 2 ml of sodium hydroxide solution mixed with organic solvent at a concentration of 2.5 mol / liter, adjust the pH to 12, raise the temperature to 90°C, drop 50 ml of formic acid solution with a concentration of 0.25 mol / liter mixed with organic solvent, continue Stir for 8 hours, then lower the temperature to 30°C. The final product was washed with deionized water until there was no chloride ion in the washing liquid, and dried under vacuum at 60° C. for 20 ...

Example Embodiment

[0030] Example 3:

[0031]Preheat the carbon nanotubes at 700°C for 40 minutes; mix 18 ml of ethylene glycol and 12 ml of water to prepare 30 ml of organic solvent, then add 15 mg of pretreated carbon nanotubes to the organic solvent, and ultrasonically disperse for 80 minutes. Carbon slurry; Measure 1.5 ml of chloroplatinic acid solution (10 mg platinum / ml) mixed with organic solvent, add dropwise to the carbon slurry, and ultrasonically disperse for 45 minutes to form a mixed suspension. Add under argon agitation 2 ml of sodium hydroxide solution mixed with organic solvent at a concentration of 0.5 mol / l, adjust the pH to 13, raise the temperature to 110°C, dropwise add 25 ml of formic acid solution with a concentration of 0.5 mol / l mixed with organic solvent, continue Stir for 4 hours, then lower the temperature to 40°C. The final product was washed with deionized water until there was no chloride ion in the washing liquid, and dried under vacuum at 120°C for 8 hours to obtain ...

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Abstract

The invention provides a method for preparing a cathode catalyst of a proton exchange membrane fuel cell, and relates to the preparation of a cathode catalyst of a Pt based unary proton exchange membrane fuel cell. The method is characterized in that: a carbon nanometer pipe is loaded with Pt to generate the catalyst; and by adjusting the initial concentration of a precursor, the ratio of a reducer to the precursor, the ratio of the reducer to OH- and the adding mode of the precursor, lowering the reduction temperature and the like, the Pt/CNTs cathode catalyst, of which the metallic particles are highly dispersed, nanometer-scaled and uniform in size, is prepared. In the method, the pretreatment on the metallic precursor and any surfactant or other protectants are unnecessary, and the catalyst can be directly reduced at a low temperature, so that the reducing activity of the catalyst on oxygen is greatly improved, and the utilization rate of the catalyst is further improved; moreover, the preparation process is easily operated, and the prepared products can be used as the cathode catalyst and the anode catalyst of other fuel cells, and also can be applied in the fields of gas reforming, cracking of organic matters, treatment of pollutants and the like.

Description

technical field [0001] The invention belongs to the technical field of catalyst production by chemical and chemical methods and the field of fuel cells, in particular to a preparation method of a platinum-based proton exchange membrane fuel cell cathode catalyst. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has unique advantages, such as abundant fuel sources, low price, high energy density, and environmental friendliness. It also has outstanding features such as rapid start-up at room temperature, no electrolyte loss, easy water discharge, and long life. features. It is converted into electrical energy by direct oxidation on the electrode, and because of its high energy density and low operating temperature, it is especially suitable for use as a mobile power source. It has broad development prospects in the fields of portable power supplies, electric vehicles, and military and civilian applications. One of the key materials of PEMFC is the elec...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M4/92B01J23/42B01J37/00B01J37/16
CPCY02E60/50
Inventor 王新东叶锋苗睿瑛王同涛方勇
Owner UNIV OF SCI & TECH BEIJING
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