A carbon-supported noble metal nanoparticle composite material and its preparation method and application

A nanoparticle and composite material technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the control of metal nanoparticle size, dispersion and loading Difficulty, limiting the effective expression of catalytic activity, reducing catalyst activity and other problems, to achieve excellent catalytic performance, broad industrial application prospects, and the effect of reducing overpotential

Active Publication Date: 2020-09-18
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the liquid phase synthesis process, a large amount of solvents and surfactants need to be added to regulate the nucleation and growth of nanoparticles, so as to prevent the aggregation and growth of metal nanoparticles. The use of solvents and surfactants often causes large negative Effects, such as tightly attached to the surface of metal nanoparticles, difficult to remove, limiting the effective expression of its catalytic activity, resulting in a reduction in catalyst activity
High-temperature solid-phase synthesis is also a common method for preparing metal nanocatalysts. However, although this method can avoid the use of solvents and surfactants, it is difficult to control the size, dispersion and loading of metal nanoparticles.

Method used

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  • A carbon-supported noble metal nanoparticle composite material and its preparation method and application
  • A carbon-supported noble metal nanoparticle composite material and its preparation method and application
  • A carbon-supported noble metal nanoparticle composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1, preparation conductive carbon supported precious metal rhodium nanoparticle composite material

[0045] Prepare carbon-loaded noble metal rhodium nanoparticle composites according to the following steps: (1) 30 mg of conductive carbon (XC-72R Vulcan carbon; specific surface area is 254.0 square meters per gram) purchased from Sigma Company and 27 mg purchased from Kunming Platinum The company's rhodium trichloride hydrate is added to the mortar, and after grinding evenly, sodium hydroxide purchased from Aladdin Company is added according to the molar ratio of sodium hydroxide and rhodium trichloride at 4:1, and sodium borohydride and precious metal The molar ratio of the precursor salt is 4:1, adding sodium borohydride purchased from Alpha Company, and after grinding for 30 minutes, the carbon-loaded noble metal rhodium nanoparticle composite material is initially prepared, and finally the above-mentioned prepared material is washed and dried, namely The c...

Embodiment 2

[0051] Embodiment 2, preparation conductive carbon supported precious metal rhodium nanoparticle composite material

[0052] Prepare conductive carbon supported precious metal rhodium nanoparticle composite material substantially according to the same method as Example 1, difference is: the amount of rhodium trichloride hydrate, sodium hydroxide and sodium borohydride in step (1) increases respectively To 2 times in Example 1.

[0053] The thermogravimetric curve of the carbon-supported noble metal rhodium nanoparticle composite material prepared in this embodiment is as follows Figure 4 shown. It can be seen from the analysis of the thermogravimetric curve that the mass percentage of the noble metal rhodium in the carbon-supported noble metal rhodium nanoparticle composite material prepared in this example is 35.71%.

Embodiment 3

[0054] Embodiment 3, preparation conductive carbon supported precious metal rhodium nanoparticle composite material

[0055] Prepare conductive carbon supported precious metal rhodium nanoparticle composite material substantially according to the same method as Example 1, difference is: the amount of rhodium trichloride hydrate, sodium hydroxide and sodium borohydride in step (1) is respectively reduced To 0.5 times in Example 1.

[0056] The thermogravimetric curve of the carbon-supported noble metal rhodium nanoparticle composite material prepared in this embodiment is as follows Figure 4 shown. It can be seen from the analysis of the thermogravimetric curve that the mass percentage of the noble metal rhodium in the carbon-supported noble metal rhodium nanoparticle composite material prepared in this example is 5.59%.

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Abstract

The invention discloses a carbon-loaded noble metal nanoparticle composite material and a preparation method thereof. The method comprises: (1) uniformly grinding a noble metal precursor salt and a carbon carrier to obtain a precursor mixture; and (2) sequentially adding an alkali and a reducing agent, continuously grinding, fully reacting to obtain a crude product, washing, and drying to obtain the carbon-loaded noble metal nanoparticle composite material. Compared with other methods, the method of the invention is low in cost, environmentally friendly, simple in process and clear in product.According to the invention, the obtained noble metal nanoparticles are small in particle size, uniform in size, highly dispersed, free of agglomeration and clean in surface; the method is suitable for large-scale production; and the water electrolysis hydrogen production performance of the obtained composite material is significantly superior to the the water electrolysis hydrogen production performance of other reported catalysts of the same type.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a composite material loaded with different carbon materials and a simple preparation method thereof. Background technique [0002] Among various heterogeneous catalysts, supported metal nanocatalysts have attracted great attention due to their intrinsic high activity and stability. The catalytic activity of supported metal nanocatalysts is closely related to the size and dispersion of metal nanoparticles. In general, reducing the size of metal nanoparticles can significantly increase their specific surface area, expose more surface active sites, and significantly modify their electronic and geometric structures, thereby greatly improving the performance of supported metal nanocatalysts. [0003] In order to obtain evenly dispersed small-sized metal nanocatalysts, liquid-phase synthesis is a common method. However, in the liquid phase synthesis proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46C25B11/06C25B1/04
CPCB01J23/462B01J23/464B01J23/468C25B1/04C25B11/091Y02E60/36
Inventor 胡劲松张云樊光银
Owner INST OF CHEM CHINESE ACAD OF SCI
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