High-Entropy Alloy Nanoparticles for Uniform Mixing and Heat Stability
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Solution Overview
Problem
Existing methods struggle to produce alloy nanoparticles with five or more types of elements that can be supported on carriers other than carbon fiber or graphene, and these nanoparticles often lack uniform mixing and stability at high temperatures.
Innovation Solution
The development of alloy nanoparticles containing five or more types of elements, specifically platinum group elements, which can be supported on non-carbon material carriers or granular carbon carriers, using a method that involves adding an aqueous solution containing salts of these elements to a liquid reducing agent heated to 200°C to 300°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If existing methods are used to produce alloy nanoparticles with five or more types of elements, then the production process can be carried out, but the nanoparticles lack uniform mixing and stability at high temperatures
Solution Approach 1:
The patent changes the chemical parameters of the synthesis system by using aqueous solutions of metal salts combined with a liquid reducing agent at controlled temperatures (200-300°C). This parameter change enables the formation of uniform multicomponent alloy nanoparticles with high thermal stability, resolving the contradiction between manufacturing precision and stability.
Solution Approach 2:
The patent introduces a liquid reducing agent as an intermediary substance that mediates the reduction of multiple metal salt precursors simultaneously. This intermediary enables uniform mixing and reduction of five or more different metal elements, achieving both uniform mixing and high-temperature stability that neither the metal salts nor the reducing agent alone could provide.
2Adaptability or versatility
If existing methods are used to produce alloy nanoparticles with five or more types of elements, then the production process can be carried out, but the nanoparticles cannot be supported on carriers other than carbon fiber or graphene
Solution Approach 1:
The patent creates alloy nanoparticles with universal compatibility across multiple carrier types including metal oxides, granular carbon, and other non-carbon materials. The nanoparticles synthesized through this method can be supported on various carriers while maintaining their structural integrity and catalytic functionality, achieving both versatility and reliability.
3Stability of the object's composition
If conventional alloy production methods are used, then the process is simpler, but the alloy cannot achieve high-entropy solid solution structure with five or more elements
Solution Approach 1:
The patent performs preliminary mixing of multiple metal salt precursors in aqueous solution before the reduction step. This preliminary action ensures that five or more different metal elements are uniformly distributed in the precursor solution, which then reduces simultaneously to form a homogeneous high-entropy solid solution structure in the final nanoparticle product.
Solution Approach 2:
The patent utilizes phase transition during the reduction process, where metal ions in aqueous solution transition to metallic nanoparticles through the action of the liquid reducing agent. This phase transition enables the formation of a stable solid solution structure containing five or more elements, achieving high-entropy configuration that conventional methods cannot produce.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the production of novel alloy nanoparticles with high substance uniformity and stability, even at high temperatures, and allows for the formation of stable quinary or higher multicomponent high-entropy alloys.
Implementation Method 1
adding an aqueous solution containing salts of five or more types of elements to a liquid reducing agent heated up to 200° C. to 300° C. and reacting them
Implementation Method 2
a liquid reducing agent heated up to 200° C. to 300° C.
Data Source
AI summary
A novel alloy nanoparticle which the alloy nanoparticle contains five or more types of elements, in the case where the alloy nanoparticle is directly supported on a carbon material carrier, the carbon material carrier excludes graphene or carbon fibers; an aggregate of alloy nanoparticles; a catalyst; a production method for alloy nanoparticles.