Precise modulation of atomic surface arrangement in high-entropy alloys for oxygen evolution

Area of Science:

• Materials Science
• Surface Chemistry
• Nanotechnology

Background:

• Conventional synthesis of high-entropy alloys (HEAs) offers limited control over elemental distribution.
• Tailoring the surface composition of HEAs is crucial for advanced applications but remains a significant challenge.
• Existing methods struggle with precise spatial regulation of elements on HEA surfaces.

Purpose of the Study:

• To develop a synthesis strategy for HEAs with controlled surface elemental composition.
• To achieve tunable surface enrichment of specific elements, such as Ruthenium (Ru), on HEAs.
• To overcome the limitations of conventional HEA synthesis in surface engineering.

Main Methods:

• Synthesis of a MnFeCoNiRu high-entropy alloy (HEA) via sodium borohydride (NaBH4) reduction.
• Application of Atomic Layer Deposition (ALD) for surface modification.
• Characterization of HEA surface composition and elemental distribution.

Main Results:

• Successfully synthesized a MnFeCoNiRu HEA.
• Demonstrated controllable Ruthenium (Ru) surface enrichment using ALD.
• Achieved tunable surface concentrations of Ru on the HEA.

Conclusions:

• The combined NaBH4 reduction and ALD approach provides precise control over HEA surface composition.
• This method enables rational engineering of HEA surfaces for tailored properties.
• The developed technique offers a pathway for creating advanced functional HEAs.