Achieving Efficient Oxygen Evolution on High-Entropy Sulfide Utilizing Low Electronegativity of Al

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Efficient and stable catalysts are crucial for advancing the oxygen evolution reaction (OER).
• Existing catalysts often face limitations in performance and durability.
• Developing novel materials is essential for improving OER efficiency.

Purpose of the Study:

• To synthesize and characterize a novel high-entropy sulfide (HES) catalyst for OER.
• To evaluate the catalytic activity and stability of the HES material.
• To elucidate the underlying mechanism of the enhanced OER performance.

Main Methods:

• One-step solvothermal synthesis of a 3D high-entropy sulfide ((FeCoNiCrCuAl)S@HCS).
• Electrochemical testing to assess OER performance, including overpotential and durability.
• Experimental and theoretical calculations (e.g., DFT) to investigate the catalytic mechanism.

Main Results:

• The synthesized (FeCoNiCrCuAl)S@HCS catalyst exhibits excellent OER performance with a low overpotential (253 mV at 10 mA cm⁻²).
• The catalyst demonstrates outstanding durability over 20,000 CV cycles, surpassing commercial RuO₂.
• Theoretical calculations identified the Cr-Al site as the dominant active site, with Al acting as an electron donor to optimize electron distribution.

Conclusions:

• The high-entropy sulfide (FeCoNiCrCuAl)S@HCS is a highly efficient and stable catalyst for the oxygen evolution reaction.
• The unique electronic structure and active sites contribute to its superior catalytic activity.
• This study offers a new strategy for designing advanced HES materials for energy applications.