Ultra-fine, highly dispersed Pd/C catalyst for direct aminic acid fuel battery and method for making same

A formic acid fuel cell and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, catalyst carrier, etc., can solve the problems of poor electrocatalytic oxidation activity, low utilization rate of Pd metal, small specific surface area of ​​catalyst, etc., and achieve The effect of uniform particle size

Inactive Publication Date: 2007-02-28
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For Pd catalysts, it is difficult to prepare Pd catalysts with smaller particle sizes by general preparation methods, so the specific surface area of ​​the catalyst is smaller, the catalyst has poor electrocatalytic oxidation activity to formic acid, and the utilization rate of Pd metal is low.

Method used

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  • Ultra-fine, highly dispersed Pd/C catalyst for direct aminic acid fuel battery and method for making same
  • Ultra-fine, highly dispersed Pd/C catalyst for direct aminic acid fuel battery and method for making same
  • Ultra-fine, highly dispersed Pd/C catalyst for direct aminic acid fuel battery and method for making same

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Take 10ml of water, add 23.7mgNaF and 70mgH 3 BO 3 , add 3.13ml 0.04504molL -1 PdCl 2 After ultrasonication for 10 minutes, add 60 mg of activated carbon and continue ultrasonication for 30 minutes to obtain PdCl 2 Adjust the pH of the suspension with activated carbon to 8-9 with ammonia water.

[0033] Take 10ml of water, add 10mg NaBH 4 , the above PdCl 2 The suspension with activated carbon was slowly added dropwise to NaBH 4 In the aqueous solution, continue to sonicate for 1 hour, and stir in a 90°C water bath for 6 hours to make the PdCl 2 with reducing agent NaBH 4 Total response.

[0034] The impurity ions were removed by washing twice with water, and dried at 60° C. under vacuum to prepare a Pd / C powder catalyst with a Pd metal loading of 20%.

[0035] Figure 1 and Figure 2 show that the average particle size of the Pd / C catalyst obtained in the presence of complexing agent and stabilizer is 3.0nm, and the particles have good dispersion and excellent u...

Embodiment 2

[0038] 10ml water, add 25mgNH 4 F and 225mgH 3 BO 3 , add 5.37ml 0.04504molL -1 PdCl 2 After ultrasonication for 10 minutes, add 60 mg of activated carbon and continue ultrasonication for 30 minutes to obtain PdCl 2 Suspension with activated charcoal.

[0039] Slowly add 10ml 0.1mol.L dropwise under ultrasonic conditions -1 Hydrazine hydrate aqueous solution was ultrasonicated at 80°C for 6 hours.

[0040] After cooling to room temperature, wash with suction and wash with water twice to remove impurity ions.2 The Pd / C powder catalyst with a Pd metal loading of 30% was obtained by drying at 60°C under air protection.

Embodiment 3

[0042] 10ml water, add 44mg KF and 125mg H 3 BO 3 , add 8.37ml 0.04504molL -1 PdCl 2 After ultrasonication for 10 minutes, add 60 mg of activated carbon and continue ultrasonication for 30 minutes to obtain PdCl 2 Suspension with activated charcoal.

[0043] Under ultrasonic conditions, 10 mL of paraformaldehyde aqueous solution containing 10 mg was slowly added, and stirred in a water bath at 90° C. for 6 hours.

[0044] After cooling to room temperature, it was filtered and washed, washed twice with water to remove impurity ions, and dried at 60°C under vacuum to obtain a Pd / C powder catalyst with a Pd metal loading of 40%.

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Abstract

The invention relates to an ultra-fine high-disperse Pd/C catalyst of formic acid fuel battery. Wherein, it comprises that Pd metal particles are loaded on the carbon carrier while its mass is 1-80% of carbon carrier and its diameter is 3.0nm; and the preparation comprise that adding complexing agent, stabilizer, PdC12 dilute solution and active carbon carrier into water to be vibrated via ultrasonic wave to obtain component A; adding over reducer and vibrating with ultrasonic wave, and the reduced Pd particles are adhered on the carbon carrier, to obtain component B; washing component B, under vacuum or inertia gas, drying it; the complexing agent is ammonium fluoride, sodium fluoride, or potassium fluoride; the stabilizer is selected from boracic acid or borax; and the reducer is NaBH4, KBH4, hydrazine hydrate, and cavaform. The invention has high electric catalyst activity on aminic acid.

Description

technical field [0001] The invention relates to a catalyst, in particular to an ultrafine, highly dispersed Pd / C catalyst for a direct formic acid fuel cell; and a method for preparing the ultrafine, highly dispersed Pd / C catalyst using an inorganic composite complex system. Background technique [0002] In recent years, direct methanol fuel cells (DMFC) have developed rapidly in recent years. Methanol has high energy density as a fuel at room temperature, but there are still many technical problems due to methanol as a fuel, such as methanol is toxic and flammable, and methanol can pass through Nafion The diaphragm reaches the cathode chamber where oxidation etc. occurs on the cathode. [0003] People are trying to find more potential alternative fuels to replace methanol, and liquid formic acid solution is a potentially attractive liquid fuel. Formic acid has the following advantages over methanol: first, formic acid is a strong electrolyte, which is beneficial to increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/90B01J23/42B01J32/00B01J37/00
CPCY02E60/50
Inventor 唐亚文张玲玲陆天虹包建春
Owner NANJING NORMAL UNIVERSITY
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