Preparation method of rhodium-platinum core-shell bimetallic nano branch and application

A bimetallic nano and nano technology, which is applied in metal processing equipment, nanotechnology, chemical instruments and methods, etc., can solve the problems of discounted platinum utilization rate, reduced active sites, and inability to be widely used, and achieves Rh stability and catalytic activity Strong, overpotential reduction effect

Active Publication Date: 2019-12-17
HUAQIAO UNIVERSITY
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  • Abstract
  • Description
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Problems solved by technology

[0004] Although the above-mentioned catalysts can exhibit excellent activity, they cannot be widely used in electrocatalysis under various conditions, which makes the utilization rate of platinum greatly reduced.
In addition, small-sized nanomaterials will agglomerate during the electrocatalytic reaction, but if the size is too large, its specific surface area will be reduced, thereby reducing its active sites.

Method used

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  • Preparation method of rhodium-platinum core-shell bimetallic nano branch and application
  • Preparation method of rhodium-platinum core-shell bimetallic nano branch and application
  • Preparation method of rhodium-platinum core-shell bimetallic nano branch and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In a 20-mL Teflon liner, add 8 mg PVP, 5 mg RhCl 3 , and 8 mL of n-octylamine, and then put them into an autoclave, start heating from room temperature, raise the temperature to 200° C., and react for 6 hours. After the reaction was completed, it was naturally cooled to room temperature, and the obtained black product A was washed more than 3 times with ethanol, and then dissolved in 1 mL of ethylene glycol to obtain a pure rhodium nanobranch solution for further use. The black product A after washing is systematically studied on its morphology by modern nano-testing and analysis techniques such as TEM, and TEM ( figure 1 a, b) Characterized by Rh nanobranch structure, the diameter is about 5.13nm.

[0031] Dissolve 2.2 mg of chloroplatinic acid and 83 mg of PVP in 1 mL of ethylene glycol, respectively, to obtain a platinum precursor salt solution and a PVP solution. Take 1mL of the above pure rhodium nanobranch solution, add 6mL of ethylene glycol solvent, then ultr...

Embodiment 2

[0034] The preparation of the pure rhodium nanobranch solution is the same as in Example 1.

[0035] Dissolve 2.2 mg of chloroplatinic acid and 83 mg of PVP in 1 mL of ethylene glycol, respectively, to obtain a platinum precursor salt solution and a PVP solution. Take 1mL of the above pure rhodium nanobranch solution, add 6mL of ethylene glycol solvent, then ultrasonically stir for a period of time, react at 150°C for 10min, then inject 0.5mL of platinum precursor salt solution and 2mL of PVP solution, the injection speed is 4mL / h, Continue to react at 150° C. for 4 hours and then cool to room temperature. The obtained black product C is washed with ethanol several times and stored in ethanol.

[0036] The morphology of the black product C was systematically studied by TEM and other modern nano-testing and analysis techniques. TEM( image 3a, 3b) Characterized as Rh@Pt 0.21 Core-shell nano-branch structure with a diameter of about 5.52nm.

Embodiment 3

[0038] The preparation of the pure rhodium nanobranch solution is the same as in Example 1.

[0039] Dissolve 2.2 mg of chloroplatinic acid and 83 mg of PVP in 1 mL of ethylene glycol, respectively, to obtain a platinum precursor salt solution and a PVP solution. Take 1mL of the above pure rhodium nanobranch solution, add 6mL of ethylene glycol solvent, then ultrasonically stir for a period of time, react at 150°C for 10min, then inject 1mL of platinum precursor salt solution and 2mL of PVP solution, the injection speed is 4mL / h, continue After reacting at 150° C. for 4 hours, it was cooled to room temperature, and the obtained black product D was washed several times with ethanol and stored in ethanol.

[0040] The morphology of the black product D is systematically studied by modern nano-testing and analysis techniques such as TEM. TEM( Figure 4 a, 4b) Characterized as Rh@Pt 0.44 Core-shell nano-branch structure with a diameter of about 5.92nm.

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Abstract

The invention discloses a preparation method of a platinum layer thickness-controllable rhodium-platinum core-shell bimetallic nano branch. The preparation method comprises the following steps that PVP is used as a surfactant, rhodium chloride is used as metal precursor salt, n-octyl amine serves as a reaction solvent and a reducing agent, high-temperature and high-pressure reaction is carried outin a polytetrafluoroethylene reaction kettle, a pure rhodium nano branch is prepared, then, the pure rhodium nano branch is repeatedly cleaned by using ethanol to remove surface organic matter, thenthe pure rhodium nano branch is dissolved in ethylene glycol, and then a platinum precursor salt solution is injected to deposit a platinum layer on the surface of the pure rhodium branch, thereby obtaining the Rh@Pt core-shell structure bimetallic nano branch. According to the preparation method, by changing the injection amount of the platinum precursor salt, the thickness of the platinum layeris regulated and controlled, the prepared product has an ultrafine core-shell nano-branch structure, and when the prepared product is applied to catalytic aspects such as alcohol electro-catalytic oxidation and hydrogen evolution reaction, the good catalytic performance can be exhibited.

Description

technical field [0001] The invention relates to a preparation method and application of rhodium-platinum core-shell bimetallic nano branches with controllable platinum layer thickness. Background technique [0002] Due to the unique optical, electrical and catalytic properties of noble metal nanomaterials, they have potential applications in many fields. Noble metal nanoparticles have a large specific surface area, and the highly coordinatively unsaturated atoms on the surface can easily participate in chemical reactions. Noble metal nanoparticles can catalyze the breaking of many chemical bonds, such as H-H, C-H, C-C, C-O bonds, etc. under appropriate conditions. In the past few decades, researchers have made a lot of efforts in the synthesis of noble metal nanomaterials and related properties, and have also achieved a lot of research results. After years of continuous accumulation, people have developed a variety of physical and chemical methods for preparing noble metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02B01J23/46B01J35/10B01J35/02B82Y40/00
CPCB22F9/24B01J23/464B01J35/10B01J35/02B01J35/0033B82Y40/00B22F1/17Y02E60/50
Inventor 谢水奋李娉婷刘凯
Owner HUAQIAO UNIVERSITY
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