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Alkali Metals Activated High Entropy Double Perovskites for Boosted Hydrogen Evolution Reaction
Ning Sun1,2, Zhuangzhuang Lai3, Wenbo Ding1
1State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876, P. R. China.
A novel high-entropy double perovskite electrocatalyst significantly boosts alkaline hydrogen evolution reaction (HER) by optimizing water dissociation. This engineered catalyst achieves high efficiency and stability, offering new pathways for advanced hydrogen production.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Efficient water dissociation is key for alkaline hydrogen evolution reaction (HER) catalysis.
- Interfacial water and intermediate interactions complicate traditional catalytic systems.
- Tailoring catalysts via electron configuration and surface bonds is essential.
Purpose of the Study:
- To develop a high-entropy double perovskite (HEDP) electrocatalyst for enhanced HER.
- To investigate the role of alkali metal-induced super-exchange interaction in HEDP.
- To elucidate the mechanisms behind improved catalytic activity and stability.
Main Methods:
- Synthesis and characterization of the HEDP electrocatalyst La₂(Co₁/₆Ni₁/₆Mg₁/₆Zn₁/₆Na₁/₆Li₁/₆)RuO₆.
- Electrochemical testing in 1 M KOH electrolyte to evaluate HER performance (overpotential, stability).
- Advanced spectral characterization and first-principles calculations to analyze electronic structure and interactions.
Main Results:
- The HEDP catalyst achieved a low overpotential of 40.7 mV at 10 mA cm⁻² and demonstrated stability over 82 hours.
- Alkali metal-induced super-exchange interaction facilitates electron transfer and optimizes hydrogen adsorption.
- Enhanced orbital hybridization and narrowed bandgap improve catalytic efficiency and proton transfer.
Conclusions:
- The developed HEDP electrocatalyst offers superior performance for alkaline HER.
- Super-exchange interaction in high-entropy crystals is a promising strategy for designing advanced catalysts.
- This study provides insights into HEDP formation and guidelines for future catalyst discovery.
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