Laser Precise Synthesis of Oxidation-Free High-Entropy Alloy Nanoparticle Libraries

Area of Science:

• Materials Science and Engineering
• Nanotechnology
• Catalysis

Background:

• High-entropy alloy nanoparticles (HEA-NPs) offer exceptional properties for advanced functional materials.
• Existing synthesis methods face challenges in achieving nonoxidized HEA-NPs with controlled composition in air.

Purpose of the Study:

• To develop a universal and facile air-based synthetic strategy for nonoxidized HEA-NPs with tunable composition.
• To explore the application of synthesized HEA-NPs as catalysts, specifically for Li-CO2 batteries.

Main Methods:

• Utilized a laser scribing method on a 3D porous graphene substrate.
• Leveraged laser-induced metastable thermodynamics and substrate-assisted confinement for alloy formation.
• Integrated an active learning approach with an adaptive design strategy for catalyst optimization.

Main Results:

• Successfully prepared single-phase solid solution HEA-NP libraries with precisely controlled atomic-level composition in air.
• The graphene substrate acted as a microreactor, preventing oxidation and enabling composition control.
• Discovered an optimal quinary HEA-NP composition exhibiting ultralow overpotential for Li-CO2 batteries.

Conclusions:

• The laser scribing method offers a simple, fast, and universal in-air route for controllable HEA-NP synthesis.
• This approach facilitates the discovery of novel HEA-NP catalysts, potentially accelerated by machine learning integration.
• Demonstrated the potential of HEA-NPs in advanced energy storage applications like Li-CO2 batteries.