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Laser solid-phase synthesis of graphene shell-encapsulated high-entropy alloy nanoparticles
Yuxiang Liu1, Jianghuai Yuan1, Jiantao Zhou1
1Research Centre for Laser Extreme Manufacturing, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
Light, Science & Applications
|September 26, 2024
Summary
A novel laser synthesis method produces graphene-encapsulated high-entropy alloy nanoparticles (HEA NPs) rapidly and efficiently. These advanced HEA NPs demonstrate superior performance in oxygen evolution reactions, paving the way for new functional materials.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- High-entropy alloy nanoparticles (HEA NPs) hold promise for advanced applications.
- Existing synthesis methods for HEA NPs often involve harsh conditions, limiting their practical use.
Purpose of the Study:
- To develop a facile and efficient method for synthesizing graphene shell-encapsulated HEA NPs.
- To investigate the underlying mechanisms of the laser solid-phase synthesis process.
- To evaluate the electrocatalytic performance of the synthesized HEA NPs for oxygen evolution reactions.
Main Methods:
- Laser solid-phase synthesis of CrMnFeCoNi nanoparticles on laser-induced graphene (LIG) supports.
- Utilizing mixed metal precursors and laser irradiation.
- Theoretical simulation and experimental observation to elucidate synthesis mechanisms.
- Fabrication of 3D binder-free electrodes using LIG-coated carbon paper.
Main Results:
- Successful synthesis of graphene shell-encapsulated CrMnFeCoNi nanoparticles with a production rate of up to 30 g/h.
- Demonstrated excellent electrocatalytic activity for oxygen evolution reaction (OER) with a low overpotential (293 mV at 10 mA/cm²) and exceptional stability (428 h).
- The synthesized NPs outperformed commercial RuO₂ and other reported catalysts for OER.
- Versatile synthesis demonstrated for various CrMnFeCoNi-based nanomaterials (oxide, sulfide, phosphide).
Conclusions:
- Laser solid-phase synthesis provides a viable, scalable, and efficient route to produce advanced HEA NPs.
- Graphene shell-encapsulated HEA NPs exhibit remarkable electrocatalytic properties for OER.
- This technique offers a promising platform for developing next-generation functional nanomaterials.
