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One-step controllable preparation method and application of a high-capacity, high-dispersion supported gold nanocatalyst

A support type, gold nanotechnology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of large particle size, low loading capacity and complicated preparation process of gold nanoparticles, and achieve good catalytic activity and loading range Wide, high-load effect

Active Publication Date: 2018-07-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In summary, the above preparation methods have problems such as large particle size of gold nanoparticles, difficulty in achieving high dispersion; low loading capacity; complicated preparation process or high temperature and high pressure.

Method used

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  • One-step controllable preparation method and application of a high-capacity, high-dispersion supported gold nanocatalyst
  • One-step controllable preparation method and application of a high-capacity, high-dispersion supported gold nanocatalyst
  • One-step controllable preparation method and application of a high-capacity, high-dispersion supported gold nanocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: Au / Graphene (16.5wt%)

[0041] Graphene (10mg) was added to dodecyl polyethylene glycol ether aqueous solution (10mL, 1mM), ultrasonically dispersed, then added chloroauric acid aqueous solution (10mL, 1mM), further ultrasonically dispersed, and then added freshly prepared boron Sodium hydride aqueous solution (10mL, 5mM), control the reaction temperature at 16°C, react for 2h, wash and dry to obtain an Au / Graphene catalyst with a theoretical loading value of 16.5wt%.

[0042] figure 1 It is a transmission electron microscope picture (TEM) of the Au / Graphene (16.5wt%) catalyst obtained in Example 1 of the present invention. Depend on figure 1 It can be seen that the gold nanocatalyst is highly dispersed on the surface of the carrier, and the particle size is small, with an average particle size of 2.5nm.

[0043] figure 2 It is the thermogravimetric analysis curve of the Au / Graphene (16.5%) catalyst obtained in Example 1 of the present invention, and ...

Embodiment 2

[0044] Embodiment 2: Au / EC600 (16.5wt%)

[0045] Activated carbon EC600 (10mg) was added to lauryl polyethylene glycol ether aqueous solution (10mL, 1mM), ultrasonically dispersed, then added chloroauric acid aqueous solution (10mL, 1mM), further ultrasonically dispersed, and then added freshly prepared boron Sodium hydride aqueous solution (10mL, 5mM), control the reaction temperature at 16°C, react for 2h, wash and dry to obtain Au / EC600 catalyst with a theoretical loading value of 16.5wt%.

[0046] image 3 It is a transmission electron microscope picture (TEM) of the Au / EC600 (16.5wt%) catalyst obtained in Example 2 of the present invention. Depend on Figure 4 It can be seen that the gold nanocatalyst is highly dispersed on the surface of the carrier, and the particle size is small, with an average particle size of 2.4nm.

[0047] Figure 4 The thermogravimetric analysis curve (TGA) of the Au / EC600 (16.5wt%) catalyst obtained in Example 2 of the present invention show...

Embodiment 3

[0050] Embodiment 3: polyethylene glycol octylphenyl ether

[0051] Graphene (10mg) was added to polyethylene glycol octylphenyl ether aqueous solution (10mL, 1mM), ultrasonically dispersed, then added chloroauric acid aqueous solution (10mL, 1mM), further ultrasonically dispersed, and then added freshly prepared boron Sodium hydride aqueous solution (10mL, 5mM), control the reaction temperature at 16°C, react for 2h, wash and dry to obtain an Au / Graphene catalyst with a theoretical loading value of 16.5wt%.

[0052] Figure 7 It is a transmission electron microscope picture (TEM) of the Au / Graphene (16.5wt%) catalyst obtained in Example 3 of the present invention. Depend on Figure 7 It can be seen that the gold nanocatalysts are highly dispersed on the surface of the support, and the particle size is small.

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Abstract

The invention relates to a one-step controllable preparation method and application of a high-capacity and high-dispersity supported nano-gold catalyst. The preparation method of the catalyst comprises the following steps: adding a carrier to a water solution containing a surfactant and carrying out ultrasonic dispersion; adding the water solution of a gold compound for ultrasonic treatment and then adding the water solution of a reducing agent; controlling the reaction temperature, and reacting for 0.5-5 hours; and then carrying out washing and drying to obtain the high-dispersity supported nano-gold catalyst. According to the preparation method, gold nanoparticles evenly grow on the carrier surface by the ultrasonic dispersion effect, so that controllable preparation of the high-dispersity supported nano-gold catalyst is achieved; and the preparation method is simple in step, mild in condition, short in preparation time, free of calcination and suitable for large-scale synthesis. The capacity range of gold in the prepared catalyst is wide (1wt%-80wt%); the electrocatalytic activity is high; and particularly, the supported nano-gold catalyst demonstrates good catalytic performance in the aspect of alcohol oxidation and can be applied to the fields of a fuel cell, an electrochemical sensor and the like.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a one-step controllable preparation method and application of a high-capacity, high-dispersion loaded gold nanocatalyst. Background technique [0002] Nano- and sub-nanometer-sized gold has quantum size effects, special surface effects, and unique physical and chemical properties, showing broad application prospects in fuel cells, chemical processes, pollution and emission control, and bioengineering. Studies have shown that the catalytic activity of supported gold nanocatalysts is closely related to the size and loading of gold particles. The smaller the gold particles, the higher the loading, and the better the catalytic activity. However, when the gold loading is too high, the distance between the gold particles becomes smaller, which increases the chance of the gold particles aggregating and making the gold particles bigger. resulting in decreased activity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/86H01M4/88Y02E60/50
Inventor 宋玉江姚瑞
Owner DALIAN UNIV OF TECH
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