Mesoporous High-Entropy Alloys With Diverse Compositions via a Versatile Kinetic-Controlled Co-Growth Approach.

Area of Science:

• Materials Science
• Nanotechnology
• Catalysis

Background:

• Mesoporous high-entropy alloys (MHEAs) offer unique properties due to accessible pores and multicomponent synergy.
• Controlled synthesis of MHEAs with specific compositions, high entropy, and defined mesoporous structures is challenging.

Purpose of the Study:

• To develop a versatile kinetic-controlled co-growth approach for synthesizing MHEAs.
• To demonstrate the synthesis of MHEAs with tunable compositions and controlled mesopore sizes.

Main Methods:

• Utilized a kinetic-controlled co-growth strategy for MHEA synthesis.
• Extended the approach to various compositions including PtPdRhAgCu, PtPdRhAgRu, and others.
• Adjusted mesoporous diameters (5.5–11.0 nm) using different triblock copolymers.

Main Results:

• Achieved PtPdRhAgCu MHEAs with high mix configurational entropy (ΔSmix = 1.600 R) and uniform morphology (~58 nm).
• Demonstrated tunable mesoporous diameters from 5.5 nm to 11.0 nm.
• Observed significantly enhanced catalytic activity and peroxidase-like performance in MHEAs with ~11 nm mesopores.

Conclusions:

• The kinetic-controlled co-growth approach enables controlled synthesis of MHEAs with tunable compositions and pore sizes.
• MHEAs with optimized mesoporous structures exhibit superior catalytic performance.
• This method provides a pathway for designing advanced MHEAs for catalytic applications.