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Preparation and usage of nanoribbon-shaped Cucurbit[6]uril carried cubic palladium nanoparticles

A technology of palladium nanoparticles and six-membered cucurbit rings, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as catalyst loss, and achieve the effects of stable catalyst, simple preparation process, and improved stability

Active Publication Date: 2014-02-19
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also true that the organic molecules introduced in the catalyst preparation process often need to be cleaned up in a very complicated process, and such a cleaning process often leads to a large loss of the catalyst

Method used

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  • Preparation and usage of nanoribbon-shaped Cucurbit[6]uril carried cubic palladium nanoparticles
  • Preparation and usage of nanoribbon-shaped Cucurbit[6]uril carried cubic palladium nanoparticles
  • Preparation and usage of nanoribbon-shaped Cucurbit[6]uril carried cubic palladium nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0030] Implementation case 1, synthesis of six-membered melon ring

[0031] (1) Dissolve urea (37.2g) and concentrated hydrochloric acid (4ml) in 400ml of water and stir vigorously.

[0032] (2) Slowly add glyoxal (30 g) to the solution described in step (1), stir at 50° C. for 10 minutes, and cool down to room temperature.

[0033] (3) The mixture obtained in step (2) was continuously reacted at room temperature for 4 hours, filtered with suction, washed with water three times, and dried to obtain a common glycoside urea.

[0034] (4) Dissolve the common glycoside urea (50g) prepared in step (3) in 80ml of concentrated hydrochloric acid.

[0035] (5) Paraformaldehyde (21.2g) was slowly added to the solution in step (4), refluxed at 100°C for 1 hour, and then refluxed at 110°C for 17h.

[0036] (6) The mixture obtained in step (5) was filtered to obtain a white precipitate, which was washed and filtered with 60% formic acid aqueous solution (repeated 3 times). The supernata...

Embodiment example 2

[0039] Implementation case 2, using palladium chloride as a precursor to prepare nanoribbon-shaped six-membered melon ring-supported cubic palladium nanoparticles

[0040] (1) 0.100mmol of six-membered melon ring and 0.100mmol of PdCl 2 Add it into 10mL deionized water, stir well at room temperature, and then place it in an oil bath preheated to 60°C until the temperature is stable to obtain a uniformly mixed light yellow turbid liquid A;

[0041](2) Prepare 2 mol / L ascorbic acid aqueous solution and 1 mol / L potassium bromide aqueous solution respectively, then add 200 μl reducing agent ascorbic acid and 10 μl potassium bromide to the mixture A prepared in step (1) at the same time to obtain mixture B;

[0042] (3) React the mixture B obtained in step (2) in an oil bath at 60°C for 6 hours, and cool naturally to room temperature;

[0043] (4) After the product obtained in step (3) is centrifuged (14000 rpm / 10 minutes), the mixture of ethanol and water (volume ratio is 1:1) is...

Embodiment example 3

[0044] Implementation case 3, using palladium nitrate as a precursor to prepare nanoribbon-shaped six-membered melon ring-supported cubic palladium nanoparticles

[0045] (1) 0.100mmol of six-membered melon ring and 0.100mmol of Pd(NO 3 ) 2 Add it into 10mL deionized water, stir well at room temperature, and then place it in an oil bath preheated to 80°C until the temperature is stable to obtain a uniformly mixed light yellow turbid liquid A;

[0046] (2) Prepare 2 mol / L ascorbic acid aqueous solution and 1 mol / L potassium bromide aqueous solution respectively, then add 200 μl reducing agent ascorbic acid and 10 μl potassium bromide to the mixture A prepared in step (1) at the same time to obtain mixture B;

[0047] (3) The mixture B obtained in step (2) was reacted in an oil bath at 80°C for 6 hours, and naturally cooled to room temperature;

[0048] (4) After the product obtained in step (3) is centrifuged (14000 rpm / 10 minutes), the mixture of ethanol and water (volume ra...

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Abstract

The invention discloses preparation and usage of cubic palladium nanoparticles carried by nanoribbon-shaped Cucurbit[6]uril. Cucurbit[6]uril is used as a nanoparticle stabilizer and a carrier, and cubic palladium nanoparticles serve as the active substance of a catalyst, can be used for a direct ethanol fuel cell catalyst, and belongs to the field of fuel cell catalyst. The cubic palladium nanoparticles are 5 to 7 nano in particle diameters, and have the advantages that the particle diameters of the particles are uniform, one-dimensional space distribution is achieved, the distribution is uniform, the catalytic activity is high, and the stability is good.

Description

technical field [0001] The invention relates to a method for preparing palladium nanoparticles as a direct ethanol fuel cell anode catalyst by using a six-membered cucurbit ring as a stabilizer and a carrier. Through the selection of reducing agent, additive and precursor salt, the morphology and dispersion of palladium nanoparticles are effectively regulated, and a direct ethanol fuel cell anode catalyst with high activity and high stability is prepared, which belongs to the field of fuel cell catalysts. Background technique [0002] Direct ethanol dye cell is a kind of proton exchange membrane fuel cell that directly uses liquid ethanol as a fuel supply source. Low-temperature electricity generation, simple electricity generation structure, high efficiency, and environmental friendliness, especially the relatively safe storage and transportation characteristics make direct ethanol dye batteries have potential commercialization prospects. At present, the precious metal pal...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCY02E60/50H01M4/92H01M4/925
Inventor 吴冬霜曹荣
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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