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Solid phase reduction preparation method for platinum, carbon catalyst of fuel cell

A fuel cell and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem that manual grinding is not suitable for large-scale production, the probability of collision is low, and the process is not easy to control, etc. problem, to achieve the effect of improving catalytic activity and anti-toxic performance, reducing waste generation, and making the preparation process simple and convenient

Inactive Publication Date: 2009-08-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method saves solvent, because the probability of collision between the particles in the solid phase system is low, the average particle size of the metal particles generated by the reaction is small, and the crystallinity is low, but this method of manual grinding is not suitable for large-scale production. applications with larger distances
[0010] All in all, there are some factors that are not conducive to improving the performance of the catalyst in the traditional preparation method, such as the existence of intense Brownian motion in the liquid phase system; particle agglomeration under high temperature conditions; complex process and difficult process control; use of harmful reducing agents Or produce a large amount of waste liquid and other environmentally unfriendly problems, etc. Therefore, the preparation methods of fuel cell catalysts still need to be improved in terms of particle size controllability, cost reduction, process simplification, and environmental pollution reduction.

Method used

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  • Solid phase reduction preparation method for platinum, carbon catalyst of fuel cell
  • Solid phase reduction preparation method for platinum, carbon catalyst of fuel cell
  • Solid phase reduction preparation method for platinum, carbon catalyst of fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) The metal salt precursor H 2 PtCl 6 ·6H 2 Add O and complexing agent sodium citrate into water, and ultrasonically dissolve it completely; H in aqueous solution 2 PtCl 6 ·6H 2 O mass volume concentration is 50g / L, H 2 PtCl 6 ·6H 2 The mass ratio of O to sodium citrate is 2:1.

[0037] (2) Add 2mol / L NaOH aqueous solution to the solution obtained in step (1), adjust the pH value to 8, add XC-72R carbon black, the amount of substance ratio Pt:C=0.015:1, ultrasonic 0.5h; 90 ℃ vacuum drying.

[0038] (3) After taking out the material gained in the step (2) and grinding it, add it into an aqueous solution of sodium formate (mass volume concentration is 70g / L) and uniformly impregnate it, vacuum-dry it at 90°C for 3h, and 2 PtCl 6 ·6H 2 The mass ratio of O to sodium formate is 1:1.

[0039] (4) After taking out the material obtained in step (3) and grinding it, put it into a ceramic boat, put it into a tubular electric furnace, treat it at 140°C for 2 hours un...

Embodiment 2

[0042] (1) The metal salt precursor H 2 PtCl 6 ·6H 2 O, RuCl 3 Add the sodium tartrate complexing agent into the mixed solution of water and acetone (volume ratio 3:1), and ultrasonically dissolve it completely; the H in the mixed solution 2 PtCl 6 ·6H 2 O and RuCl 3 The mass volume concentration is 150g / L, H 2 PtCl 6 ·6H 2 O, RuCl 3 The molar ratio of substances is Pt:Ru=1:1; metal salt precursor H 2 PtCl 6 ·6H 2 O, RuCl 3 , and the substance ratio of sodium tartrate is 1:5.

[0043] (2) Add 2mol / L NaOH aqueous solution to the mixed solution obtained in step (1), adjust the pH value to 11, add XC-72R carbon black, the ratio of substances is Pt:C=0.075:1, ultrasonic 1h, 90 ℃ vacuum drying.

[0044] (3) After taking out the material obtained in step (2) and grinding it, it is added to an aqueous solution of glucose (mass volume concentration is 200g / L) for uniform impregnation, and then vacuum-dried at 90° C. for 5 hours; the metal salt precursor H 2 PtCl 6 ·6H...

Embodiment 3

[0048] (1) The metal salt precursor H 2 PtCl 6 ·6H 2 Add O and disodium edetate complexing agent into water and isopropanol solvent (volume ratio 3:1), and ultrasonically dissolve it completely; then add solid accelerator silicomomolybdic acid, and continue ultrasonication for 10 minutes; mix H in solution 2 PtCl 6 ·6H 2 The mass volume concentration of O is 100g / L, and the H 2 PtCl 6 ·6H 2 The mass ratio of O to disodium edetate is 1:2, and the mass ratio of O to silicomomolybdic acid is 1:1.

[0049] (2) Add 2 mol / L NaOH aqueous solution to the mixed solution obtained in step (1), adjust the pH value to 10, add XC-72R carbon black, the amount of substance ratio Pt:C=0.025:1, ultrasonic 0.75h; Vacuum dried at 90°C.

[0050] (3) After taking out the material obtained in step (2) and grinding it, it is added to an aqueous solution of sodium sulfite (mass volume concentration is 100g / L) for uniform impregnation, and then vacuum-dried at 90° C. for 4 hours; the metal sal...

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Abstract

A solid-phase reduction method for preparing the Pt / C catalyst used for fuel battery includes such steps as adding metallic salt and complexing agent to solvent, ultrasonic dissolving, adding alkaline substance to regulate pH=8-11, adding C carrier, ultrasonic mixing, vacuum drying, grinding, immersing in the aqueous solution of reducer, vacuum drying, grinding, reducing reaction in N2, cooling in N2, water washing, and vacuum drying. Said catalyst may be Pt / C, Pt-Ru / C, Pt-Mo-Si / C, Pt-Ru-Mo-Si / C, Pt / CNT, Pt-Ru / CNT, Pt-Mo-Si / CNT, or Pt-Ru-Mo-Si / CNT.

Description

technical field [0001] The invention belongs to the preparation technology of proton exchange membrane fuel cell (PEMFC) and direct alcohol fuel cell (DAFC) catalysts, and particularly relates to a solid-phase reduction preparation method of platinum-carbon catalysts used in these two types of fuel cells. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of fuel into electrical energy efficiently and cleanly. Among them, low-temperature fuel cells, such as proton exchange membrane fuel cells (PEMFC) and direct alcohol fuel cells (DAFC), have the characteristics of low operating temperature, fast start-up, and high energy conversion efficiency. They are ideal substitutes for electric vehicles, field power stations, and portable power supplies in the future. Power supply is one of the priority types of fuel cell development. Catalyst materials, especially anode catalysts, are key materials for this type of fuel cell. However, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/16B01J23/42B01J21/18H01M4/90H01M4/92
CPCY02E60/50
Inventor 廖世军叶立炎刘军民
Owner SOUTH CHINA UNIV OF TECH
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