Preparation method of carbon material loaded nano-scale multi-component alloy

Abstract

The invention discloses a preparation method of a carbon material loaded nano-scale multi-component alloy. The method comprises the following steps that firstly, a carbon material raw material is modified and prepared with alloy precursor salt to obtain a steady-state colloid solution; secondly, the steady-state colloid solution is atomized and dried to obtain modified carbon material raw materialloaded precursor nano-particles; and thirdly, the modified carbon material raw material loaded precursor nano-particles are calcined and reduced to obtain the powder-state carbon material loaded nano-scale multi-component alloy. According to the method, the modified carbon material raw material is prepared with the alloy precursor salt, the mixture is atomized and dried, thus the alloy precursorsalt forms nano-particles to be uniformly loaded on the surface of the carbon material raw material, then calcining and reducing are carried out, the carbon material loaded nano-scale multi-componentalloy is obtained, the nano-scale multi-component alloy is uniformly dispersed on the surface of a carbon material, a single-phase structure or a multi-phase structure is formed, and the alloy has theadvantages of being large in specific surface area, multiple in metal active site and stable in phase structure, and has an excellent application potential in the field of catalytic materials.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a preparation method of a carbon material-supported nanoscale multi-element alloy. Background technique [0002] As a hot material, multi-component alloy nanoparticles have been widely studied by researchers at home and abroad. Because of their excellent physical and chemical properties, they have been widely used in the fields of catalysis and energy storage. Generally, more metal elements are mixed together to form nano-alloy materials, and its performance is expected to surpass that of single alloy or low-element alloy nanoparticles. At present, the most important method to obtain multi-component alloy nanoparticles is liquid-phase chemical method, which has obvious advantages in preparing multi-component alloy nanoparticles with various shapes, particle sizes and phase compositions. However, most of the research reports on the liquid-phase ...

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Problems solved by technology

However, due to the limitations of the wet chemical method, it is difficult to uniformly condense more than 5 elements into a single nanoparticle, which is not suitable for the preparation of other components of multi-component alloy nanoparticles.

Until March 2018, Hu Liangbing's research group published a report titled "Synthesis of High Entropy Alloy Nanoparticles by Carbon Thermal Shock Method" in the journal Science. The researchers used the carbon thermal shock method to systematically prepare 2-8 yuan (Pt, Pd, Ni, Co, Fe, Au, Cu and Sn) carbon nanofibers loaded with high-entropy alloy nanoparticles, and explored the catalytic performance of high-entropy alloy nanoparticles for ammonia oxidation, high-entropy alloy nanoparticles showed excellent Catalytic performance, this method breaks through the limitation of wet chemical method, and effectively prepares 2-8 yuan high-entropy alloy nanoparticles, but this method still has shortcomings, the required experimental conditions are relatively harsh, and the cooling rate needs to reach 105K / s. The matrix (carrier) must have good conductivity, so it is difficult to meet the subsequent mass preparation and performance control

In June 2018, Rekha MY, Nitin M and others reported an article entitled "Preparation of Graphene-loaded High-Entropy Alloy Nanoparticles for the First Time" in Scientific Reports, using mechanical ball milling to compound metal powder and graphene, and placed in dodecane sulfuric acid Ultrasound in sodium to prepare graphene-supported high-entropy alloy nanoparticles (NiFeCrCuCo), but this method is difficult to promote uniform distribution of elements in a single nanoparticle through ball milling, segregation will occur, and the particle size of the prepared nanoparticles is uncontrollable

This method prepares micron-sized high-entropy alloys, which is not suitable for the preparation of high-entropy alloy nanoparticles

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