Research Progress of High-entropy Oxides for Electrocatalytic Oxygen Evolution Reaction

Area of Science:

• Materials Science
• Electrochemistry
• Renewable Energy Technology

Background:

• High-entropy oxides (HEOs) exhibit unique "four-core effects" (high-entropy, delayed diffusion, lattice distortion, cocktail effects).
• These properties make HEOs attractive for renewable energy applications, particularly in catalysis.
• HEOs are being explored as potential electrocatalysts for the oxygen evolution reaction (OER).

Purpose of the Study:

• To review recent advancements in HEOs for electrocatalytic oxygen evolution reaction (OER) in water electrolysis.
• To analyze HEO performance regarding activity and stability in acidic and alkaline media.
• To summarize design strategies, reaction mechanisms, and future prospects of HEOs for OER.

Main Methods:

• Literature review focusing on the synthesis, characterization, and electrochemical performance of HEOs for OER.
• Analysis of HEOs' activity and stability under various conditions (acidic/alkaline).
• Summary of design principles including elemental composition, structure, morphology, and catalyst-support interactions.

Main Results:

• HEOs demonstrate significant potential as electrocatalysts for OER, crucial for water electrolysis.
• Performance varies with HEO composition, structure, and operating conditions (acidic vs. alkaline).
• Challenges remain in precise synthesis and achieving long-term stability for practical applications.

Conclusions:

• HEOs offer a promising platform for developing efficient and stable OER electrocatalysts.
• Further research into rational design and understanding reaction mechanisms is needed.
• Future directions include exploring HEOs beyond water electrolysis and optimizing their performance.