Light-driven regulation preparation method and electrocatalysis activity of nanometer material

A nanomaterial and alloy nanomaterial technology, applied in the field of proton exchange membrane fuel cell catalyst, can solve the problems of long reaction time, organic solvent, high temperature, lack of universality, etc., and achieve excellent activity, mild conditions, and excellent catalytic activity. Effect

Inactive Publication Date: 2013-01-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] Most of the above synthetic methods need to adopt higher tem...

Method used

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  • Light-driven regulation preparation method and electrocatalysis activity of nanometer material
  • Light-driven regulation preparation method and electrocatalysis activity of nanometer material
  • Light-driven regulation preparation method and electrocatalysis activity of nanometer material

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Embodiment 1

[0055] Pipette 1 mL of zinc porphyrin (10 μM) polyoxyethylene lauryl ether (Brij-35, 1 mM) aqueous solution into the reaction flask, and the solution was in a stirring state, followed by adding 1 mL of 20 mM potassium chloroplatinite aqueous solution and 1 mL of 150 mM Aqueous solution of ascorbic acid, reacted in a tungsten halogen lamp (75V, light intensity 570nmol cm -2 the s -1 ) under irradiation for 60 seconds, turn off the light source, and the reaction is complete after at least 30 minutes. The reacted mixture is transferred to a centrifuge test tube, centrifuged to obtain a solid product, washed with deionized water, and dried to obtain a spherical branched platinum nano-catalyst.

[0056] Such as image 3 , TEM photos show that the spherical branched structure has a single shape and a uniform size.

[0057] Such as Figure 4 , the particle size distribution shows that the average particle size is 15.61±1.96nm, and the particle size distribution is 12.56%.

[005...

Embodiment 2

[0063] Embodiment 2: (lighting time is different)

[0064] Pipette 1 mL of zinc porphyrin (10 μM) polyoxyethylene lauroyl ether (Brij-35, 1 mM) aqueous solution into the reaction flask, and the solution was in a stirring state, followed by adding 1 mL of 20 mM potassium chloroplatinite solution and 1 mL of 150 mM Ascorbic acid solution, reacted in a tungsten halogen lamp (75V, light intensity 570nmol cm -2 the s -1 ) for 20 seconds under irradiation, turn off the light source, and the reaction is complete after at least 30 minutes. The reacted mixture is transferred to a centrifuge test tube, centrifuged to obtain a solid product, washed with deionized water, and dried to obtain a spherical branched platinum nano-catalyst.

[0065] Such as Figure 10 , TEM photos show that the spherical branched structure has a single shape and a uniform size.

[0066] Such as Figure 11 , the particle size distribution shows that the average particle size is 27.82nm±3.64nm, and the parti...

Embodiment 3

[0067] Embodiment 3: (lighting time is different)

[0068] Pipette 1 mL of zinc porphyrin (10 μM) polyoxyethylene lauroyl ether (Brij-35, 1 mM) aqueous solution into the reaction flask, and the solution was in a stirring state, followed by adding 1 mL of 20 mM potassium chloroplatinite solution and 1 mL of 150 mM Ascorbic acid solution, reacted in a tungsten halogen lamp (75V, light intensity 570nmol cm -2 the s -1 ) for 40 seconds under irradiation, turn off the light source, and the reaction is complete after at least 30 minutes. The reacted mixture is transferred to a centrifuge test tube, centrifuged to obtain a solid product, washed with deionized water, and dried to obtain a spherical branched platinum nano-catalyst.

[0069] Such as Figure 12 , TEM photos show that the spherical branched structure has a single shape and a uniform size.

[0070] Such as Figure 13 , the particle size distribution shows that the average particle size is 19.85±2.5nm, and the particle...

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Abstract

The invention relates to a light-driven regulation preparation method and electrocatalysis activity of a nanometer material. According to the present invention, a light-driven in situ nucleation method is adopted to regulate the average particle size of metal and alloy nanometer materials and the uniformity of particle size distribution, and modulate an illumination time, an illumination intensity, light source types, metal macrocyclic compound concentration and metal precursor concentration so as to achieve optically controlled synthesis of metal and alloy nanometer materials. The method of the present invention has characteristics of light controlling, simple operation, mild conditions, environment-friendliness, and easy amplification synthesis. The spherical branched platinum nanometer material prepared by the light controlled method of the present invention has a high electrochemical activity specific surface area, shows excellent electrocatalysis activity in an oxygen reduction reaction, and provides excellent electrocatalysis activity for methanol electrocatalysis oxidation reaction.

Description

technical field [0001] The invention belongs to the field of catalysts for proton exchange membrane fuel cells, and relates to a preparation method for light-driven control of nanomaterials and its electrocatalytic activity. Background technique [0002] Many functional properties of metal and alloy nanomaterials are not only closely related to morphology and composition, but also closely related to size and size distribution. Effective control of the particle size and size distribution of metal and alloy nanoparticles is crucial to the practical application of materials and is a focus of materials science research. Relevant research has been carried out at home and abroad, and some progress has been made. [0003] For example: Li Yadong et al. prepared CuAu and Cu with monodisperse particle size 3 Au double member nanocrystals (Chen, W.; Yu, R.; Li, L., et al. Angew. Chem. 2010, 122, 2979.). Shi Jianlin et al. reported that Fe with monodisperse particle size 3 o 4 It i...

Claims

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Application Information

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IPC IPC(8): B01J23/60B01J23/62B01J37/34B22F9/24H01M4/90
CPCY02E60/50
Inventor 宋玉江司维峰李佳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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