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Preparation method of fusiform platinum nanoparticles

A platinum nanoparticle, shuttle-shaped technology, applied in the field of preparation of shuttle-shaped platinum nanoparticles, can solve the problems of expressing catalytic performance, not easy to remove, limiting the exposure of platinum group metal nanoparticles surface active sites, etc., which affect the catalytic activity, and achieve Improve the electrochemical active area, avoid adsorption, and improve the effect of electrocatalytic performance

Active Publication Date: 2020-06-23
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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Problems solved by technology

However, due to the strong chemical adsorption of these additives on the surface of platinum group metal nanoparticles, it is not easy to remove, so that most of the synthesized metal nanoparticles have additives adsorbed on the surface, which greatly limits the exposure of the active sites on the surface of platinum group metal nanoparticles. Affected the expression of its catalytic activity and the follow-up study of its catalytic performance

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  • Preparation method of fusiform platinum nanoparticles

Examples

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Embodiment 1

[0032] A preparation method for spindle-shaped platinum nanoparticles, comprising the following steps:

[0033] (1) Polish the titanium sheet with a purity of 99.99% and a length and width of 10×10 cm with TiC sandpaper of 300 mesh and 800 mesh for 1 hour respectively until the surface of the titanium sheet is bright, and then cut the polished titanium sheet to a length and width of 2.5×1.0 cm, and then ultrasonically clean the cut titanium sheet with 5vt% hydrochloric acid, absolute ethanol, and deionized water for 5 minutes, and finally dry it for later use.

[0034] (2) The titanium sheet prepared in step (1) was used as the working electrode, and a spectroscopically pure graphite rod with a diameter of 0.6 cm and a length of 10 cm was used as an auxiliary electrode. It was deposited in an electrolyte solution with a volume of 10 mL at 25 ° C for 90 min, wherein the The concentration of chloroplatinic acid in the electrolyte is 0.5mmol / L, the concentration of zinc nitrate i...

Embodiment 2

[0040] A preparation method of shuttle-shaped platinum nanoparticles is basically the same as the preparation method of Example 1, except that in the electrolyte, the concentration of chloroplatinic acid is 1.0mmol / L, the concentration of zinc nitrate is 10mmol / L, ammonium acetate The concentration is 10mmol / L. The morphology of the shuttle-shaped platinum nanoparticles prepared in this example is relatively regular, and the loading capacity of Pt is about 74.2 μg / cm 2 , the current density of its catalytic methanol oxidation can reach 680mA / mg Pt .

Embodiment 3

[0042] A preparation method of spindle-shaped platinum nanoparticles is basically the same as the preparation method in Example 1, except that the electrodeposition time is changed to 120 minutes. The morphology of the shuttle-shaped platinum nanoparticles prepared in this example is relatively regular, and the loading capacity of Pt is about 94.3 μg / cm 2 , the current density of its catalytic methanol oxidation can reach 580mA / mg Pt .

[0043] In summary, the porous shuttle-shaped platinum nanoparticles synthesized by the preparation method of the present invention have the advantages of regular shape, uniform size, large specific surface area, excellent electrocatalytic performance, etc., and have high use value and good application prospects; at the same time, The preparation method of the present invention is a simple and easy constant current electrodeposition synthesis method, which has the advantages of low energy consumption, simple and easy access to raw materials, g...

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Abstract

The invention discloses a preparation method of fusiform platinum nanoparticles. The preparation method comprises the following steps: placing a working electrode and an auxiliary electrode in an electrolyte containing chloroplatinic acid, zinc nitrate and ammonium acetate for constant-current deposition, placing an obtained deposition product in an acid solution or an alkali solution for dissolution to remove zinc oxide, and performing cleaning and vacuum drying to obtain fusiform platinum nanoparticles with a porous structure. Compared with the traditional preparation method, the porous fusiform platinum nanoparticles synthesized by the preparation method disclosed by the invention have the advantages of regular morphology, uniform size, large specific surface area, excellent electrocatalytic performance and the like, and have very high use value and very good application prospect; and meanwhile, no surfactant or other additives are used in the synthesis process, adsorption of related additives on the surfaces of the particles is avoided, and the method has the advantages of being low in energy consumption, easy and convenient to obtain raw materials, environmentally friendly, free of toxicity and pollution and the like, and facilitates expression of the catalytic activity of the precious metal nanoparticle catalyst and follow-up electro-catalytic performance research.

Description

technical field [0001] The invention relates to a method for preparing an electrocatalyst material, in particular to a method for preparing shuttle-shaped platinum nanoparticles. Background technique [0002] With the development of the world economy and the continuous increase of per capita energy consumption, the depletion of traditional fossil energy such as coal, oil, and natural gas has led to an increasingly prominent global energy crisis. At the same time, the ecological environment pollution caused by the excessive consumption of fossil energy has also become the focus of attention. In view of this situation, the research and development of new energy sources has been paid more and more attention by the governments of various countries. The proportion of non-fossil energy such as wind energy, nuclear energy, and solar energy in the energy systems of various countries is also gradually increasing. However, regardless of the source or conversion method of new energy,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/90H01M4/88B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/8825H01M4/8853H01M4/9041H01M4/92Y02E60/50
Inventor 许瀚李万千吴义强卿彦熊福全
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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