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Low-platinum high active core-shell structure catalyst and preparation method thereof

A technology of catalyst and shell structure, applied in the field of low-platinum high-activity core-shell structure catalyst and its preparation, can solve the problems of expensive platinum and achieve the effects of solving cost and performance, easy control of reaction conditions, and simple preparation process

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

At present, most of the catalysts used in low-temperature fuel cells are based on the precious metal platinum, and the price of platinum is very expensive due to the limitation of resources, so that the cost of catalysts occupies a large proportion in the total cost of fuel cells.

Method used

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  • Low-platinum high active core-shell structure catalyst and preparation method thereof
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  • Low-platinum high active core-shell structure catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: Preparation of Pd@Pt / C catalyst

[0025] Add 42.9 mg of palladium chloride into a 50 ml round-bottomed flask, add 25 ml of ethylene glycol, stir with a magnet, and sonicate for more than 0.5 hours to completely dissolve it. Add 193.8 mg of sodium citrate, stir until completely dissolved, adjust the pH of the solution to 9 with 5% KOH / EG solution; add 102.8 mg of sodium formate, 100 mg of carbon powder, stir for 0.5 hours, and ultrasonically for 0.5 hours; the obtained solution is transferred to high pressure Put it in a reaction kettle in an oven, and react at 160°C for 8 hours; the resultant is suction-filtered, washed with water three times until no chloride ions are detected in the solution, and vacuum-dried at 70°C to constant weight to obtain a catalyst precursor.

[0026] Weigh 17.0 mg of chloroplatinic acid, add to a round bottom flask, and add 20 ml of ethylene glycol (ethylene glycol is a solvent and also a reducing agent), and adjust the pH value...

Embodiment 2

[0028] Embodiment 2: Preparation of PdFe@Pt / C catalyst

[0029]Add 19.2mg of palladium chloride and 106.0mg of ferric chloride into a 50ml round-bottomed flask with 25ml of ethylene glycol, stir with a magnet, and ultrasonically dissolve them all for more than 0.5 hours; add 294.3mg of sodium citrate, and stir until completely dissolve. Use 5% KOH / EG solution to adjust the pH of the solution to 10, add 156.2 mg of sodium formate and 100 mg of carbon nanotubes, stir for 0.5 hours, and sonicate for 0.5 hours.

[0030] The above solution was transferred to an autoclave, placed in an oven, and reacted at 160° C. for 8 hours. The resultant was suction-filtered, washed with water three times until no chloride ions were detected in the solution, and vacuum-dried at 70°C to constant weight to obtain a catalyst precursor.

[0031] Weigh 9.4mg of chloroplatinic acid, add to a round bottom flask, and add 20ml of ethylene glycol, 5% KOH / EG solution to adjust the pH of the solution to be...

Embodiment 3

[0033] Embodiment 3: Preparation of PdCo@Pt / C catalyst

[0034] Add 36.3 mg of palladium chloride and 32.3 mg of cobalt chloride into a 50 ml round-bottomed flask, then add 25 ml of ethylene glycol, stir with a magnet, and ultrasonically dissolve them all for more than 0.5 hours; add 232.0 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 123.12 mg of sodium formate, add 100 mg of carbon powder, stir for 0.5 hours, and sonicate for 0.5 hours; React for 8 hours. The resultant was suction-filtered, washed with water three times until no chloride ions were detected in the solution, and vacuum-dried at 70°C to constant weight to obtain a catalyst precursor.

[0035] Weigh 8.9 mg of chloroplatinic acid, add to a round bottom flask, and add 20 ml of ethylene glycol, adjust the pH of the solution to be alkaline to 10 with 5% KOH / EG solution, add 1 ml of formaldehyde, and add 50 mg of the catalyst precu...

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Abstract

The invention provides a high active core-shell structure catalyst used for low temperature fuel cell. The preparation method comprises the following steps: adopting carbon powder or carbon nanotubesas carrier, coating single-layer or two-layer platinum which is reduced by reductant, on the metal-based core to form a core-shell structure and loading the structure on carbon powder or carbon nanotubes carrier. The catalyst has low platinum loading and high catalytic activity so that platinum loading is low, the activity of the catalyst is high; the contradiction between the cost and performanceof catalyst is effectively solved, and the high active core-shell structure catalyst plays an extremely important role in solving the current problems of the fuel cell.

Description

technical field [0001] The invention belongs to the technical field of chemical energy and relates to a catalyst for fuel cells, in particular to a low-platinum high-activity core-shell structure catalyst for low-temperature fuel cells and a preparation method thereof. Background technique [0002] With the increasingly severe energy problems and environmental problems caused by burning coal and other fossil fuels, the research and development of hydrogen energy and fuel cells have been paid more and more attention by governments and scientific circles all over the world. Fuel cell technology is considered to be a new energy technology that is most likely to replace existing energy on a large scale due to its important advantages such as high energy conversion efficiency, low impact on the environment (zero or low emission), and rich and diverse fuel sources. It is one of the important technical means to solve future energy problems and serious environmental pollution proble...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/44B01J35/02B01J37/16H01M4/96H01M4/92
CPCY02E60/50
Inventor 王荣方王伟王辉雷自强张伟
Owner NORTHWEST NORMAL UNIVERSITY
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