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High-performance low-platinum catalyst for methanol fuel cell and preparation method thereof

A technology of methanol fuel cell and platinum catalyst, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. It can solve the problems of low utilization rate and high Pt loading, and achieve long service life and good stability Sex, the effect of mild reaction conditions

Inactive Publication Date: 2010-03-10
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a high-performance catalyst with low Pt load in order to overcome the problems of high Pt loading and low utilization rate in the carbon-supported platinum catalyst of the prior art, so that precious metals can be utilized more effectively

Method used

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  • High-performance low-platinum catalyst for methanol fuel cell and preparation method thereof
  • High-performance low-platinum catalyst for methanol fuel cell and preparation method thereof
  • High-performance low-platinum catalyst for methanol fuel cell and preparation method thereof

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Effect test

Embodiment 1

[0029] Embodiment 1: the preparation of Pt-PdFe / C catalyst

[0030] Wash the carbon powder repeatedly with acetone first, and then wash it with 1~3mol L under stirring. -1 The acid is treated, and then with a mass concentration of 20 to 30% H 2 o 2 Oxidation for 1 to 5 hours.

[0031]Add 33.3mg of palladium chloride into a 50ml round bottom flask, add 25ml of ethylene glycol, add a magnet to stir, and ultrasonically dissolve it completely for more than 0.5 hours, then add 290.4mg of ferric chloride, add 742.4mg of sodium citrate, and stir until completely dissolved. Use 5% KOH / EG solution to adjust the pH value of the solution to 8, add 375.4 mg of sodium formate, add 120 mg of carbon powder, stir for 0.5 hours, and ultrasonic for 0.5 hours; Leave to react for 8 hours; the obtained sol is suction-filtered, washed with water three times until no chloride ion is detected in the solution, and dried at 70° C. to obtain a catalyst precursor.

[0032] Add 3 mg of chloroplatinic...

Embodiment 2

[0034] Embodiment 2: the preparation of Pt-PdZn / C catalyst

[0035] Add 33.3 mg of palladium chloride into a 50 ml round bottom flask, add 25 ml of ethylene glycol, add a magnetic sub-stirrer, and ultrasonically dissolve it completely for more than 0.5 hours, then add 125.0 mg of zinc chloride, add 650.2 mg of sodium citrate, and stir until completely dissolved. Use 5% KOH / EG solution to adjust the pH value of the solution to 9, add 230.0 mg of sodium formate, add 120 mg of carbon powder, stir for 0.5 hours, ultrasonic for 0.5 hours; After reacting for 8 hours, the obtained sol was suction-filtered, washed with water three times until no chloride ion was detected in the solution, and dried overnight at 70°C to obtain a catalyst precursor.

[0036] Add 3 mg of chloroplatinic acid into a round-bottomed flask, add 20 ml of water, adjust the pH of the solution to 9 with KOH aqueous solution, add 50 mg of the catalyst precursor prepared above, stir for 20 minutes, ultrasonicate fo...

Embodiment 3

[0038] Embodiment 3: the preparation of Pt-PdSn / C catalyst

[0039] Add 66.7mg of palladium chloride into a 50ml round bottom flask, add 25ml of ethylene glycol, add a magnet to stir, and ultrasonically dissolve it completely for more than 0.5 hours, then add 70.1mg of tin chloride and 419.3mg of sodium citrate, and stir until completely dissolved. Use 5% KOH / EG solution to adjust the pH value of the solution to alkali 9, add 148.3 mg of sodium formate, add 120 mg of carbon powder, stir for 0.5 hours, ultrasonic for 0.5 hours; Leave to react for 8 hours. The obtained sol was suction-filtered, washed with water three times until no chloride ion was detected in the solution, and dried overnight at 70°C to obtain the catalyst precursor.

[0040] Add 3 mg of chloroplatinic acid into a round-bottomed flask, add 20 ml of water, adjust the pH of the solution to 9 with KOH aqueous solution, add 50 mg of the catalyst precursor prepared above, stir for 20 minutes, ultrasonicate for 20...

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Abstract

The invention provides a preparation method of a high-performance low-platinum catalyst for the methanol fuel cell. The method adopts simple displacement reaction to coat a small amount of Pt or Pt and Ru on the surface of Pd alloy and loads the materials on carbon powder together so that the dosage of precious metal Pt is greatly reduced and the cost of the catalyst is effectively reduced. The catalyst prepared by the invention has high catalytic activity of methanol oxidation electrocatalysis, good stability and long service life, thus being a good high-performance catalyst which can be directly used for methanol fuel cells.

Description

technical field [0001] The invention belongs to the technical field of fuel cell electrode catalysis application, and relates to a method for preparing a high-performance low-platinum catalyst for fuel cells, in particular to a method for preparing a high-performance low-platinum catalyst for methanol fuel cells. Background technique [0002] A fuel cell is an energy conversion device that directly converts the chemical energy of fuel into electrical energy by electrochemical reaction without combustion. It has high energy conversion density, low pollution, diverse fuels, high reliability, low noise and easy maintenance. It is considered to be the alternative energy technology that is most likely to be applied in large-scale commercial applications. [0003] Pt has high electrocatalytic activity for methanol oxidation, and Pt has high chemical stability in acid, so Pt is generally used as anode catalyst. Although other metals have also been reported as catalysts for methano...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90B01J37/00B01J23/89B01J23/60B01J23/62
CPCY02E60/50
Inventor 王荣方王伟王辉雷自强常迎
Owner NORTHWEST NORMAL UNIVERSITY
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