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Carbon-carried platinum-based catalyst for fuel cell and its preparation method

A fuel cell and carbon-supported platinum technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem that the particle size distribution of active components is not uniform enough, the process is not easy to control, and the process flow is complicated and other problems, to achieve the effect of uniform particle size distribution of active components, high recovery rate and simple process

Inactive Publication Date: 2009-05-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation cost of this method is high, and the pH value needs to be adjusted repeatedly, the process is complicated, and the process is not easy to control
[0011] U.S. Patent Application 20040087441 discloses a sol method for preparing Pt / C and PtRu / C catalysts. The active component particle size of the catalyst prepared by the method is 0.7nm to 10nm. For the PtRu / C system, the active component particle size It can reach 0.5 to 2.5nm, and the particle size distribution of the active components is still not uniform enough

Method used

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  • Carbon-carried platinum-based catalyst for fuel cell and its preparation method
  • Carbon-carried platinum-based catalyst for fuel cell and its preparation method
  • Carbon-carried platinum-based catalyst for fuel cell and its preparation method

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Effect test

Embodiment 1

[0041] The preparation method of the carbon-supported platinum-based catalyst for fuel cells, the steps include:

[0042] (1) H 2 PtCl 6 ·6H 2 O. Add sodium citrate to the mixed solution of propylene glycol and ethylene glycol, and stir at room temperature for 10 minutes to fully dissolve it. H in the mixed solution 2 PtCl 6 ·6H 2 The mass volume concentration of O is 1g / L, the volume ratio of propylene glycol to ethylene glycol is 1:5, and the H 2 PtCl 6 ·6H 2 The mass ratio of O to sodium citrate is 1:5;

[0043] (2) Adding mass concentration to the mixed solution obtained in step (1) is an ethylene glycol solution of 5% KOH, adjusting the pH value to 8, and heating to reflux for 4 hours under normal pressure with nitrogen protection;

[0044] (3) Add Xc-72R carbon black to the mixed solution obtained in step (2), the molar ratio of metal Pt to Xc-72R carbon black is Pt:C=0.015:1, and stir at room temperature for 12 hours to make the metal sol particles uniform Dis...

Embodiment 2

[0048] The preparation method of the carbon-supported platinum-based catalyst for fuel cells, the steps include:

[0049] (1) H 2 PtCl 6 ·6H 2 O, sodium oxalate is added in the mixed solution of ethylene glycol and propylene glycol, stirred at room temperature for 60 minutes, H in the mixed solution 2 PtCl 6 ·6H 2 The mass volume concentration of O is 20g / L, the volume ratio of ethylene glycol to propylene glycol is 1:1, and the H 2 PtCl 6 ·6H 2 The mass ratio of O to sodium oxalate is 10:1;

[0050] (2) adding a propylene glycol solution with a mass concentration of 10% NaOH to the mixed solution obtained in step (1), adjusting the pH value to 11, and heating to reflux for 8 hours under normal pressure with nitrogen protection;

[0051] (3) Add carbon nanotubes to the mixed solution obtained in step (2), the molar ratio of metal Pt to carbon nanotubes is Pt:C=0.015:1, stir at room temperature for 48 hours, so that the metal sol particles are evenly dispersed in the na...

Embodiment 3

[0055] The preparation method of the carbon-supported platinum-based catalyst for fuel cells, the steps include:

[0056] (1) H 2 PtCl 6 ·6H 2 O, sodium tartrate is added in the mixed solution of ethylene glycol and glycerol, stirred at room temperature for 30 minutes, H in the mixed solution 2 PtCl 6 ·6H 2 The mass volume concentration of O is 15g / L, the volume ratio of ethylene glycol and glycerol is 1:2, H 2 PtCl 6 ·6H 2 The mass ratio of O to sodium tartrate is 1:1;

[0057] (2) Adding a glycerin solution with a mass concentration of 8% KOH to the mixed solution obtained in step (1), adjusting the pH value to 10, and heating to reflux for 6 hours under normal pressure with nitrogen protection;

[0058] (3) Add carbon nanotubes to the mixed solution obtained in step (2), the molar ratio of metal Pt to carbon nanotubes is Pt:C=0.025:1, stir at room temperature for 24 hours, so that the metal sol particles are evenly dispersed in the nanometer on the carbon tube;

...

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Abstract

The invention discloses a making method of platinum-on-carbon based catalyst in the fuel battery, which comprises the following steps: adding the metal salt pioneer body, complexing agent and alcohol reducer in the organic solvent; stirring at atmospheric temperature; adding alkaline material; adjusting the pH value; protecting heat reflux through nitrogen or in the autoclave; adding the carbon carrier to stir at atmospheric temperature; diffusing the metal sol particle evenly on the carbon carrier; adding acid material to adjust the pH value; adding second distilled water to break sol through ultrasonic shock; filtering the filter cake until the Cl- is not detected; drying the vacuum; cooling; grinding to produce the platinum-on-carbon based catalyst within Pt / C, Pt-Ru / C, Pt-Ru-Ir / C, Pt / CNT, Pt-Ru / CNT and Pt-Ru-Ir / CNT.

Description

technical field [0001] The invention relates to the field of fuel cell catalysts, in particular to a carbon-supported platinum-based catalyst for fuel cells and a preparation method thereof. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of fuel into electrical energy efficiently and cleanly. Proton exchange membrane fuel cells (PEMFC) and direct alcohol fuel cells (DAFC) are considered to be the most promising fuel cells for transportation, communication and other mobile applications, because these two types of batteries are used in vehicle power sources, various mobile communication Therefore, the research on this kind of fuel cell has been highly valued by various countries. [0003] At present, these two types of fuel cells have encountered some problems in the commercialization process, the most prominent of which are their high price and short life. For RPEMFC and DAFC fueled by reformed gas, there is also the problem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/03B01J23/40
Inventor 廖世军刘军民王宁卡特周琛王荣方
Owner SOUTH CHINA UNIV OF TECH
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