Method for preparing nano-Pd or Pd platinum alloy electrocatalyst for fuel cell

A technology of electrocatalyst and fuel cell, which is applied in the direction of catalyst activation/preparation, battery electrodes, chemical instruments and methods, etc. It can solve the problems of poor performance of oxygen electrodes and achieve the effects of easy operation, good application prospects and simple methods

Inactive Publication Date: 2007-12-05
上海新微科技集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Meanwhile, for DMFC, because methanol can permeate from the anode to the cathode through the proton exchange membrane, resulting in the "mixed potential" effect of the cathode, resulting in poor performance of the oxygen electrode [Wenming Wang, Dan ...

Method used

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  • Method for preparing nano-Pd or Pd platinum alloy electrocatalyst for fuel cell
  • Method for preparing nano-Pd or Pd platinum alloy electrocatalyst for fuel cell
  • Method for preparing nano-Pd or Pd platinum alloy electrocatalyst for fuel cell

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Experimental program
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Effect test

Embodiment 1

[0020] The preparation of embodiment 1, Pd / C (20wt.%) catalyst

[0021] 1. Weigh 50mg of PdCl 2 (metal palladium content 59.98%), it is dissolved in the water of 13ml and stirs to dissolve, and the amount of adding the same substance is 2.8ml concentration and is the EDTA solution of 0.1mol / L, is warming up to 60 ℃ and constant temperature stirring 40min, and the solution changes from brown to Bright yellow, then continue to stir and cool to room temperature (component A).

[0022] 2. Add NaOH solution with a concentration of 1.0mol / L dropwise to the cooled solution, adjust the pH to 9~10, add 120mg of XC-72 carbon, ultrasonicate for 30min, and stir for 1.5h to disperse evenly (component B).

[0023] 3. Slowly add 8ml of NaBH with a concentration of 4.5mg / ml dropwise under the condition of stirring 4 Solution, and continue to stir for 1h, then filter, wash with deionized water and ultrapure water in turn, until no chloride ion can be detected by silver nitrate. Then, the ca...

Embodiment 2

[0026] The preparation of embodiment 2, Pd / C (60wt.%) catalyst

[0027] 1. Weigh 90mg of PdCl 2 (metal palladium content 59.98%), it is dissolved in the water of 10ml and stirs to dissolve, and adding 1.1ml concentration is the DTPA solution of 0.5mol / L, is warming up to 60 ℃ and constant temperature stirring 40min, and solution turns bright yellow by brown, then continues Stir and cool to room temperature (Component A).

[0028] 2. Add NaOH solution with a concentration of 1.0mol / L dropwise to the cooled solution, adjust the pH to 9-10, add 36mg of XC-72 carbon, ultrasonicate for 30min, and stir for 1.5h to disperse evenly (component B).

[0029] 3. Slowly add 10ml of NaBH with a concentration of 5.0mg / ml dropwise under the condition of stirring 4 solution (reducing agent required in theory is 9.6mg, get 5 times the amount), and continue to stir for 1h, then filter, wash with deionized water until there is no chloride ion, during which the aqueous solution of silver nitrate...

Embodiment 3

[0032] Embodiment 3, the preparation of PdPt (1: 1, 20wt.%) / C catalyst

[0033] 1. Weigh 25mg of PdCl 2 (metal palladium content 59.98%), it is dissolved in the water of 5ml and stirs to dissolve, and the Na of 79.2mg is weighed in addition 2 PtCl 6 ·6H 2 O was dissolved in 5ml of water, then the two solutions were mixed and stirred, 5.6ml of EDTA solution with a concentration of 0.05mol / L was added, the temperature was raised to 60°C and stirred at constant temperature for 40min, and then continued to stir and cooled to room temperature (component A).

[0034] 2. Add dropwise NaOH solution with a concentration of 1.0mol / L to the cooled solution, adjust the pH to 9~10, add 171.7mg of XC-72 carbon, ultrasonicate for 30min, and then stir for 1.5h to disperse evenly (component B) .

[0035] 3. Slowly add 12ml of NaBH with a concentration of 4.67mg / ml dropwise under the condition of stirring 4 solution, and continue to stir for 1h, then filter, wash with deionized water until...

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Abstract

The invention relates to a preparation method of a nanometer Pd or the Pd platinum gold electrocatalysis catalyzer which is used in a kind of fuel cell, whose characteristic lies in that dissolve the mixture of the ration Pd salt or the Pd salt and the platinum salt (in which the Pd atomic ratio accounts for metal quantity 10-100%) in the water, after joining the right amount complexing agent solution, elevates temperature to 0-80deg.C and keeps the temperature 5 minutes to 8 hours, then cooling to the room temperature, adjusts the pH value to 5 to 12 and adds the carbon carrier, then adds the solution of hydroboration sodium, hydrazine or formic acid and so on reducing agent under the 0 to 80deg.C , and maintains 10 minutes to 10 hours, then filtrating, laundering, dry, finally in inert atmosphere or reducing atmosphere through 100 to 300deg.C heat treatment in 0.5 to 10h, namely carries the carbon Pd or the Pd platinum electrocatalysis. The particle size of catalyst is controllable, adjustable, the composition is controllable, regards the heat treatment temperature to be different, the particle size which obtains is relatively 1.8nm to 20nm above, and the granule distribution is narrow, is suitable to serve as the direct formic acid fuel cell anode catalyst as well as the direct methanol fuel cell anti-methyl alcohol negative pole catalyst.

Description

technical field [0001] The invention relates to a method for preparing a nano-palladium or palladium-platinum alloy electrocatalyst for a fuel cell, and belongs to the field of direct formic acid fuel cells and direct methanol fuel cells. Background technique [0002] Fuel cell power generation device has high energy conversion efficiency, less environmental pollution, and can be used as an ideal power source in the future. Therefore, it has attracted extensive attention from scientists all over the world. For this reason, countries all over the world have invested a lot of manpower, material and financial resources in research. [0003] Proton exchange membrane fuel cells using liquid fuels such as methanol, ethanol, or formic acid have the advantages of abundant fuel sources, low price, easy transportation and storage of fuel, high energy density, and easy miniaturization. They are suitable as portable power sources and have very wide applications. Prospects [Lingling Zhan...

Claims

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Application Information

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IPC IPC(8): H01M4/90B01J23/44B01J23/42B01J37/00
CPCY02E60/50
Inventor 杨辉朱昱李晓伟周群黄庆红邹志青
Owner 上海新微科技集团有限公司
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