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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The temperature is high, the process is cumbersome, and the process is complicated

Method used

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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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preheat the carbon nanotubes at 800°C for 20 minutes; mix 6 milliliters of ethylene glycol and 9 milliliters of water to prepare 15 milliliters of organic solvent, then add 18 milligrams of pretreated carbon nanotubes to the organic solvent, and ultrasonically disperse them for 30 minutes. into a carbon slurry; measure 3.0 milliliters of chloroplatinic acid solution (5 mg platinum / ml) mixed with an organic solvent, add dropwise to the carbon slurry, and disperse with ultrasonic waves for 30 minutes to form a mixed suspension. Under the condition of argon stirring, add 5 ml of sodium hydroxide solution mixed with an organic solvent at a concentration of 1.0 mol / L, adjust the pH to 10, raise the temperature to 70°C, add dropwise 18 ml of a formic acid solution mixed with an organic solvent at a concentration of 0.75 mol / L, continue Stir for 12 hours, then cool to 50°C. The final product was washed with deionized water until there was no chloride ion in the washing solutio...

Embodiment 2

[0029] Preheat carbon nanotubes at 500°C for 60 minutes; mix 10 milliliters of ethylene glycol and 10 milliliters of water to prepare 20 milliliters of organic solvent, then add 20 milligrams of pretreated carbon nanotubes to the organic solvent, and ultrasonically disperse them for 60 minutes. into a carbon slurry; measure 2.0 milliliters of chloroplatinic acid solution (7.5 mg platinum / ml) mixed with an organic solvent, add dropwise to the carbon slurry, and disperse with ultrasonic waves for 60 minutes to form a mixed suspension. Under the condition of argon stirring, add 2 ml of sodium hydroxide solution mixed with an organic solvent at a concentration of 2.5 mol / L, adjust the pH to 12, raise the temperature to 90°C, add dropwise 50 ml of a formic acid solution mixed with an organic solvent at a concentration of 0.25 mol / L, continue Stir for 8 hours, then cool down to 30°C. The final product is washed with deionized water until there is no chloride ion in the washing liqui...

Embodiment 3

[0031]Pre-heat the carbon nanotubes at 700°C for 40 minutes; mix 18 milliliters of ethylene glycol and 12 milliliters of water to prepare 30 milliliters of organic solvent, then add 15 milligrams of pretreated carbon nanotubes to the organic solvent, and ultrasonically disperse them for 80 minutes. into a carbon slurry; measure 1.5 milliliters of chloroplatinic acid solution (10 mg platinum / ml) mixed with an organic solvent, add dropwise to the carbon slurry, and disperse with ultrasonic waves for 45 minutes to form a mixed suspension. Under the condition of argon stirring, add 2 ml of sodium hydroxide solution mixed with an organic solvent at a concentration of 0.5 mol / L, adjust the pH value to 13, raise the temperature to 110°C, add dropwise 25 ml of a formic acid solution mixed with an organic solvent at a concentration of 0.5 mol / L, continue Stir for 4 hours, then cool down to 40°C. The final product was washed with deionized water until there was no chloride ion in the wa...

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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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