Core-shell structure nanometer material for silver cores/platinum shells and preparation method of core-shell structure nanometer material

Abstract

The invention provides a core-shell structure nanometer material for silver cores / platinum shells and a preparation method of the core-shell structure nanometer material, and belongs to the field of functional materials. The core-shell structure nanometer material is composed of silver single-crystal cores and a platinum shell layer. The overall particle size ranges from 1 nm to 40 nm. The particle size of the silver single-crystal cores ranges from 0.1 nm to 38 nm. The thickness of the platinum shell layer is extremely small. The particle size of the silver single-crystal cores is uniform. The overall morphology of the material is uniform. The material is high in dispersibility. The preparation method includes the steps of firstly, preparing a sodium citrate solution, adding inorganic silver salt precursors, obtaining a mixed solution after conducting stirring, adding sodium borohydride, and continuing to conduct stirring to obtain a silver seed crystal solution; secondly, adding surface active agents and reducing agents in the silver seed crystal solution obtained in the first step, adding inorganic platinum salt after the heating reaction, taking sediment after cooling and centrifugation, and obtaining the core-shell structure nanometer material for silver cores / platinum shells. The preparation method is simple in process, easy and convenient to operate, high in repeatability, gentle in used reaction condition and friendly to the environment.

Description

technical field [0001] The invention belongs to the field of functional materials, and in particular relates to a granular silver core / platinum shell core-shell nanomaterial and a preparation method thereof. Background technique [0002] Platinum metal has unique properties due to its physical and chemical properties. It is widely used in various fields such as industrial catalysis, environment, energy, and biology. It is a very important precious metal. In the field of energy, platinum is the most important catalyst with the best performance in fuel cell technology, and has received great attention from scientific researchers. However, due to the fact that the proven reserves of platinum on the earth are very small and it is a scarce resource, the application of platinum metal faces the problem of cost. If pure platinum is used as a catalyst to build a fuel cell, the cost of fuel cell technology will be too high. High, which has become an obstacle to its promotion and wide...

AI Technical Summary

Problems solved by technology

[0005] 1) The catalytic activity cannot meet the existing demand;

[0006] 2) Poor anti-virus ability and short lifespan;

Now there are many types of metal / platinum core / shell structure materials, such as AuPt, PtAu, Fe 3 o 4 AuPt, etc. have also conducted more in-depth research on this type of material, and this type of material has also shown potential, but the current research still needs to be improved. First of all, the cost of the core material itself is relatively high, such as Ni, Au, Pd, etc. , cannot significantly reduce the overall cost of platinum-based materials, and the second is that the production process is complicated and the conditions of use are not friendly to the environment

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