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

Method used

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

Examples

Experimental program
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Effect test

Example Embodiment

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

[0025] Add 42.9mg of palladium chloride to a 50ml round-bottomed flask, add 25ml of ethylene glycol, add magnets and stir, ultrasonically for more than 0.5 hours to completely dissolve. Add 193.8mg of sodium citrate, stir to completely dissolve, adjust the pH of the solution with 5% KOH / EG solution to 9; add 102.8mg of sodium formate, 100mg of carbon powder, stir for 0.5 hours, ultrasonic for 0.5 hours; transfer the resulting solution to high pressure The reaction kettle is placed in an oven and reacted 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 dried in vacuum at 70°C to constant weight to obtain a catalyst precursor.

[0026] Weigh 17.0 mg of chloroplatinic acid, add it to a round-bottomed flask, and add 20 ml of ethylene glycol (ethylene glycol is a solvent and also a reducing agent), use 5% KOH / EG solution to adjust the pH valu...

Example Embodiment

[0028] Example 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 ultrasound for more than 0.5 hours to completely dissolve them; add 294.3mg of sodium citrate and stir until complete Dissolve. Adjust the pH of the solution to 10 with a 5% KOH / EG solution, add 156.2 mg of sodium formate and 100 mg of carbon nanotubes, stir for 0.5 hours, and ultrasonic 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 dried in vacuum at 70°C to constant weight to obtain a catalyst precursor.

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

Example Embodiment

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

[0034] Add 36.3mg of palladium chloride and 32.3mg of cobalt chloride to a 50ml round-bottomed flask, then add 25ml of ethylene glycol, stir with a magnet, and ultrasound for more than 0.5 hours to completely dissolve it; add 232.0mg of sodium citrate and stir to completely dissolved. Adjust the pH of the solution to 9 with 5% KOH / EG solution, add 123.12 mg of sodium formate, 100 mg of carbon powder, stir for 0.5 hours, and ultrasonic for 0.5 hours; transfer the solution to the autoclave and place it in an oven at 160°C React for 8 hours. The resultant was suction filtered, washed with water three times until no chloride ions were detected in the solution, and dried in vacuum at 70 degrees to constant weight to obtain a catalyst precursor.

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

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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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