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Preparation method of flower-like-structure platinum nanomaterial

A flower-like structure, platinum nanotechnology, applied in nanotechnology, structural parts, chemical instruments and methods, etc., can solve the problems of non-recyclability, environmental and human health hazards, high price, etc., and achieve high methanol electrochemical catalytic activity, The effect of big application prospects

Active Publication Date: 2020-08-25
SHANXI DATONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many problems in the use of organic solvents and organic protective agents. Most highly toxic and volatile organic solvents will cause serious harm to the environment and human health; and the organic protective agent molecules adsorbed on the surface of catalyst particles are not easy to be removed. These Impurities will adversely affect the surface activity of the catalyst; in addition, the high price and non-recyclability of organic solvents and organic protective agents are not conducive to the large-scale production and commercial application of catalysts

Method used

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  • Preparation method of flower-like-structure platinum nanomaterial
  • Preparation method of flower-like-structure platinum nanomaterial

Examples

Experimental program
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Effect test

Embodiment 1

[0011] Example 1: Grind and mix 4.12g KOH and 5.44g NaOH evenly and add to the PTFE lining, using KNO 3 -LiNO 3 The mixed salt bath is used as the heat source to completely melt the NaOH-KOH mixed salt at 180°C, keep the stirring speed at 1000-8000 rpm, add 17.6 mg tetraammineplatinum oxalate at 180°C, raise the temperature to 200°C, and continue the reaction for 3 Hours, stop the reaction, after cooling, add distilled water to dissolve the solid salt, centrifuge and wash multiple times, and dry to obtain a platinum nanoflower-like structure.

[0012] like figure 1 As shown, it can be seen from the scanning photo in a that the product is composed of nanoflower-like structures with a relatively uniform size, and the further enlarged scanning photo shows that the size of the nanoflower is about 400-500 nm (b). c-e are transmission photos of platinum nanoflowers. From c, it can be seen that platinum nanoflowers are composed of central stamens and branch-like petals scattered ar...

Embodiment 2

[0014] Example 2: Grind and mix 4.12g KOH and 5.44g NaOH evenly and add to the PTFE lining, using KNO 3 -LiNO 3 The mixed salt bath is used as the heat source to completely melt the NaOH-KOH mixed salt at 180°C, keep the stirring speed at 1000-8000 rpm, add 17.6 mg tetraammineplatinum oxalate at 180°C, raise the temperature to 230°C, and continue the reaction for 3 hour, stop the reaction, after cooling, add distilled water to dissolve the solid salt, centrifuge and wash several times, and dry to obtain the product.

[0015] like figure 2 As shown, it can be seen that the product is a sunflower-like flower-like platinum nanostructure with a size of about 2-3.5 μm.

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Abstract

The invention belongs to the technical field of preparation of platinum nanomaterials, and aims to solve the problems that an organic solvent and an organic protective agent are used for preparing platinum nanomaterials and thus cause serious harm to the environment and human health, high price and recyclability, large-scale production and commercial application are difficult to conduct and the like. The invention provides a preparation method of a flower-like-structure platinum nanomaterial. The preparation method comprises the following steps: a KNO3-LiNO3 mixed salt bath is used as a heating heat source, KOH and NaOH are uniformly mixed and completely melted at 180 DEG C, an organic compound of platinum is added while stirring, a temperature is increased to 200 or 230 DEG C, a reactionis performed for 3 h, then natural cooling is performed, distilled water is added to dissolve a solid salt, and repeated centrifugal separation, cleaning with distilled water and drying are successively performed so as to obtain the flower-like-structure platinum nanomaterial. Any organic surfactant and structure directing agent are not used in the preparation process, the surface of the producedplatinum nanomaterial is very clean, and the platinum nanomaterial is directly used in electrochemical catalysis, has very high ORR and methanol electrochemical catalytic activity, and shows great application prospects in the fields of catalyst preparation and application.

Description

technical field [0001] The invention belongs to the technical field of preparation of platinum nanomaterials, and in particular relates to a preparation method of platinum nanomaterials with a flower-like structure. Background technique [0002] Noble metal platinum nanomaterials have excellent electrocatalytic properties and are widely used as catalysts for the anode oxidation and cathode oxygen reduction reactions of fuel cells. The performance of the catalyst is closely related to its structure, composition, morphology, surface atomic distribution, size, etc. The preparation of platinum and platinum-based alloys with appropriate size, specific morphology, and excellent catalytic performance can greatly reduce the cost of fuel cells and promote Popularization of fuel cells. [0003] At present, the preparation of platinum nanomaterials is mostly in the water phase or oil phase, adding surfactants or structure-directing agents to prevent the aggregation of nanoparticles an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/58H01M4/88H01M4/92B82Y40/00
CPCB01J23/58H01M4/921H01M4/88B82Y40/00B01J35/33Y02E60/50
Inventor 卢珍秦君荆补琴刘锐杨堃赵海东
Owner SHANXI DATONG UNIV