Alloy nanoparticles, preparation method and applications thereof

A technology of alloy nanoparticles and metals, which is applied in the field of nanomaterials, can solve the problems of high catalyst cost, cumbersome processing work, complicated process, etc., and achieve good catalytic effect

Active Publication Date: 2019-12-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN201910366879.4 obtains CoCr(Mn/Al)FeNi high-entropy alloy nanoparticle catalysts through ultrasonic cleaning, impregnation, vacuum distillation, drying, and calcination, but the process is complicated and time-consuming, and the obtained alloy nanoparticles Larger particle size (34-338nm) and other problems, and does not involve easy-reducible metals such as Pt, Au, and Pd; Chinese patent CN201910126803.4 uses an oil bath reduction method to prepare platinum-based binary alloy nanoparticles, and the reduction temperature of this method is relatively low. Low, only suitable for the preparation of binary alloy nanoparticles, not suitable for the preparation of high-entropy alloy nanoparticles, and the preparation process requires organic substances such as n-hexane and oleylamine, which is easy to cause environmental pollution; Chinese patent CN201811446654.1 uses microwave The preparation of platinum-non-noble metal alloy nanoparticles by heating method has the problems of high catalyst cost (expensive substrate), cumbersome substrate pre-treatment work (need to use ball milling and roasting procedures); Yonggang Yao et al. (Y.Yao et al. ,Carbothermal shock synthesis of high-entropy-alloy nanoparticles.Science 359,1489-1494(2018).) using

Method used

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  • Alloy nanoparticles, preparation method and applications thereof
  • Alloy nanoparticles, preparation method and applications thereof
  • Alloy nanoparticles, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Add 20 mg of catalyst substrate (graphene oxide) into 20 mL of ultrapure water, and disperse for 8 hours with an ultrasonic cleaning instrument to obtain a uniform and stable catalyst substrate dispersion (1 mg / mL), which is stored in a refrigerator for later use. figure 1 is the topography of a blank graphene oxide catalyst substrate obtained by transmission electron microscopy. Depend on figure 1 It can be seen that the surface of the blank graphene oxide catalyst substrate is smooth and free of particles.

[0049] Prepare a surfactant solution, the volume of the solution is 5mL, the amount of surfactant (tannic acid) is 15mg, and the ultrasound is over 0.5h.

[0050] Configure the metal solution, the metal solution consists of CuCl 2 , IrCl 3 、CoCl 2 , SnCl 2 , PdCl 2 、NiCl 2 、H 2 PtCl 6 , HAuCl 4 , MnCl 2 , RhCl 3 Several compositions of isometallic salts, wherein the total metal concentration is 2mM, and the metals are in equimolar ratio. Ultrasound ...

Embodiment 2

[0053] Referring to the method described in Example 1, the tannic acid in Example 1 was replaced with glucose, and the rest of the reaction conditions were the same as in Example 1 to prepare precursor 2;

[0054] With reference to the method described in Example 1, the tannic acid in Example 1 was replaced with polyvinylpyrrolidone (PVP), and the remaining reaction conditions were the same as in Example 1 to prepare precursor 3;

[0055] Referring to the method described in Example 1, but no surfactant is added in the step, and the remaining reaction conditions are the same as in Example 1, the precursor 4 is prepared;

[0056] image 3 It is the morphology map and element distribution map of Precursor 2, Precursor 3 and Precursor 4. Will figure 2 and image 3 For comparison, it can be found that: when the surfactant is tannic acid or glucose, a substance similar to a film is formed on the surface of the catalyst substrate, and various metal ions in the precursor 1 are ev...

Embodiment 3

[0058] The precursor 1 in the embodiment 1 is utilized the fast moving bed pyrolysis method (such as Figure 4 As shown, the precursor 1 is placed in a porcelain boat, and the porcelain boat is placed in the glass tube at the front end of the tube furnace, the inert gas is introduced, the temperature program of the tube furnace is set, the tube furnace is started, and the temperature of the tube furnace is at At 900°C, push the porcelain boat into the tube furnace for rapid temperature rise. After the reaction is completed (1h), the porcelain boat is pushed out of the tube furnace. After the temperature of the sample is lowered (<50° C.), the sample is taken out) to prepare alloy nanoparticles.

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Abstract

The invention discloses alloy nanoparticles, a preparation method and applications thereof. According to the method, a metal precursor loaded on a substrate is rapidly reduced at a high temperature, wherein the metal is rapidly nucleated to avoid the generation of the split-phase alloy so as to form the alloy nanoparticles with ultra-small particle size; and by controlling the types of the metal salts in the precursor, the components in the alloy nanoparticles can be effectively regulated. According to the present invention, the FeCoPtPdIr@GO (FeCoPtPdIr alloy particles are loaded on the surface of graphene oxide) prepared in the embodiments of the invention shows excellent electrochemical hydrolysis hydrogen production performance, can stably operate for 150 h under a condition of 10 mA.cm<-2>, has excellent electrochemical stability, and has the Faraday efficiency of 99.4%, wherein the eta 10 of the product of the present invention is equal to 42 mV, and far exceeds the eta 10 of thecommercial Pt/C of 64 mV (the smaller the eta 10, the better the electrochemical hydrolysis hydrogen production performance); and the new thought is provided in the preparation of alloy nanoparticlesand alloy nanometer catalysts, and the development of alloy nanometer catalysts in catalysis and energy is promoted.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to alloy nanoparticle and its preparation method and application. Background technique [0002] Alloys refer to substances with metallic properties that are synthesized by two or more metals and metals or nonmetals by a certain method. A high-entropy alloy is a type of alloy, which is a mixture of five or more metal elements. High-entropy alloys have the characteristics of multiple principal elements, that is, the atomic percentages of each alloy element are equal or approximately equal, resulting in an effect called "cocktail". The "cocktail" effect refers to the characteristics of various metal elements and the interaction between them to produce a complex effect in high-entropy alloys. For example, if more light elements are used, the overall density of the alloy will decrease; if more oxidation-resistant elements, such as aluminum or silicon, are used, the alloy's ...

Claims

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Application Information

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IPC IPC(8): B01J23/89C25B11/06C25B1/04
CPCB01J23/8913B01J23/892B01J23/8966B01J23/8986B01J35/0013B01J35/0033B01J35/006B01J35/0093C25B1/04C25B11/075Y02E60/36
Inventor 张兴旺郝少云高少杰
Owner ZHEJIANG UNIV
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