Oxygen-vacancy rich multi-level morphology HEO for high catalytic performance oxygen evolution reactions

Area of Science:

• Materials Science
• Catalysis
• Inorganic Chemistry

Background:

• High-entropy materials offer unique properties due to their complex composition.
• Developing efficient synthesis routes for high-entropy oxides (HEOs) is crucial for advanced applications.
• Metal-organic frameworks (MOFs) and layered double hydroxides (LDHs) are versatile precursors for material synthesis.

Purpose of the Study:

• To synthesize a novel FeNiCoMnSn high-entropy oxide.
• To investigate the role of a high-entropy metal-organic framework@high-entropy layered double hydroxide (HE-MOF@HE-LDH) precursor in enhancing material properties.
• To evaluate the catalytic activity and stability of the synthesized HEO.

Main Methods:

• Calcination of a composite precursor containing HE-MOF and HE-LDH.
• Characterization of the resulting high-entropy oxide (HEO).
• Assessment of catalytic activity and stability.

Main Results:

• Successful synthesis of FeNiCoMnSn HEO via the proposed precursor route.
• The HE-MOF inclusion significantly increased oxygen vacancy concentration.
• A multi-level morphology was observed, contributing to enhanced catalytic performance.
• The HEO exhibited exceptional catalytic activity and stability.

Conclusions:

• The combined HE-MOF@HE-LDH precursor strategy is effective for synthesizing advanced HEOs.
• Enhanced oxygen vacancy and unique morphology are key factors for the superior catalytic properties.
• This work provides a new pathway for designing high-performance high-entropy oxide catalysts.