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Method for preparing carbon nano tube loaded cobalt-platinum alloy catalyst

An alloy catalyst, carbon nanotube technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., to achieve suitable for large-scale production, rapid reaction, and improved Pt source The effect of utilization

Active Publication Date: 2010-06-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems existing in the existing fuel cell electrode catalysts, and provide a carbon nanotube-supported cobalt-platinum alloy with low cost, suitable for large-scale industrial production, no pollution, and uniform particle size distribution of active components Catalyst preparation method

Method used

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  • Method for preparing carbon nano tube loaded cobalt-platinum alloy catalyst
  • Method for preparing carbon nano tube loaded cobalt-platinum alloy catalyst
  • Method for preparing carbon nano tube loaded cobalt-platinum alloy catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Surface pretreatment of carbon nanotubes:

[0025] ① Soak carbon nanotubes in 1M hydrochloric acid at room temperature for 24 hours, filter 5 times, and dry in vacuum;

[0026] ② Take 2.02 g of carbon nanotubes dried in step ① and put them in a three-necked flask, and add 180 ml of H 2 SO 4 and 60ml HNO 3 (HNO 3 The dropping speed should be slow), put it in an oil bath at 60°C, reflux for 7 hours, cool to room temperature after the reaction, filter and wash repeatedly until the pH is neutral, and dry in vacuum for 24 hours to obtain a modified product with good surface hydrophilicity carbon nanotubes;

[0027] 2) Preparation of working electrode:

[0028] ①Weigh 50mg surface modified carbon nanotubes, 0.075mmol CoCl 2 ·6H 2 O, 0.05 mmol H 2 PtCl 6 ·6H 2 O and 0.05ml mass fraction of 5% nafion solution were added to 2.2ml water for dissolving, ultrasonically dispersed for 30min to obtain carbon slurry;

[0029] ② Coat the carbon paste prepared in step ① on ...

Embodiment 2

[0033] 1) Surface pretreatment of carbon nanotubes:

[0034] ① Soak carbon nanotubes in 1M hydrochloric acid at room temperature for 24 hours, filter 5 times, and dry in vacuum;

[0035] ②Take 1 g of the dried carbon nanotubes in step ① and put them in a three-necked flask, add 90ml of H 2 SO 4 Finally, place in an oil bath at 120°C, reflux for 5 hours, cool to room temperature after the reaction, filter and wash repeatedly until the pH is neutral, and dry in vacuum for 24 hours to obtain modified carbon nanotubes with good surface hydrophilicity;

[0036] 2) Preparation of working electrode:

[0037] ①Weigh 100mg surface modified carbon nanotubes, 0.2mmol CoSO 4 ·7H 2 O, 0.2mmol of dinitrosodiammine platinum and 0.2ml of nafion solution with a mass fraction of 5% were added to 4ml of water for dissolution, ultrasonically dispersed for 40min to obtain a carbon slurry;

[0038] ② Coat the carbon paste prepared in step ① on the conductive glass according to the substrate area...

Embodiment 3

[0042] 1) Surface pretreatment of carbon nanotubes:

[0043] ① Soak carbon nanotubes in 1M hydrochloric acid at room temperature for 24 hours, filter 5 times, and dry in vacuum;

[0044] ② Take 2.02 g of carbon nanotubes dried in step ① and place them in a three-necked flask, and add 60 ml of H 2 SO 4 and 60ml HNO 3 Finally, place in an oil bath at 80°C, reflux for 12 hours, cool to room temperature after the reaction, filter and wash repeatedly until the pH is neutral, and dry in vacuum for 24 hours to obtain modified carbon nanotubes with good surface hydrophilicity;

[0045] 2) Preparation of working electrode:

[0046] ①Weigh 100mg surface modified carbon nanotubes, 0.3mmol CoSO 4 ·7H 2 O, 0.3 mmol H 2 PtCl 6 ·6H 2 O and 1ml of nafion solution with a mass fraction of 5% were added to 5ml of water for dissolution, and ultrasonically dispersed for 60min to obtain a carbon slurry;

[0047] ② Coat the carbon paste prepared in step ① on the carbon cloth according to th...

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Abstract

A method for preparing a carbon nano tube loaded cobalt-platinum alloy catalyst belongs to the fields of nano composite catalysts and fuel cells. The electrode catalyst of the conventional fuel cell has the problems of uneven grain size distribution of active components, high cost and the like. By using a carbon nano tube working electrode containing a cobalt-platinum based active precursor as a cathode, using a platinum electrode as an anode and using solid-phase electrolysis salt as electrolyte, the carbon nano tube loaded cobalt-platinum alloy catalyst is generated in situ through pulse electro-deposition. The method has the advantages that the method can effectively control the grain size, composition and load of Co-Pt alloy nano grains, has low cost and no pollution, and is suitable for large-scale production and the like.

Description

technical field [0001] The invention belongs to the field of nanocomposite catalysts and fuel cells, and in particular relates to a preparation method of a carbon nanotube-loaded cobalt-platinum alloy catalyst. Background technique [0002] Direct methanol fuel cell (DMFC) has broad application prospects in portable power supply, electric vehicles and other fields due to its advantages of high energy density, low operating temperature, no corrosion, and easy transportation and storage of liquid fuel. One of the key technologies of DMFC is the preparation of electrode catalysts, whose activity directly affects the performance of fuel cells. So far, the method of loading catalyst nanoparticles on the surface of the carrier is mainly used to avoid the agglomeration of nanoparticles and increase its specific surface area, thereby improving its catalytic efficiency. Carbon nanotubes have many excellent physical and chemical properties, which make them widely used in many fields,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88B01J23/89
CPCY02E60/50
Inventor 王峰杨福庆赵永彬刘景军
Owner BEIJING UNIV OF CHEM TECH
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