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Published on: October 5, 2019
High-Entropy-Induced Lattice Distortion Activates Dual-Cobalt Site Synergy for Boosted Photo(Electro)Catalytic
Bao-Feng Shan1, Zong-Yan Zhao1, Huiting Huang2
1Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, P. R. China.
High-entropy spinel oxides enhance solar water splitting by overcoming activity-stability limits. This novel material demonstrates superior photocatalytic and photoelectrochemical performance for efficient solar fuel production.
Area of Science:
- Materials Science
- Catalysis
- Renewable Energy
Background:
- The activity-stability trade-off limits solar water splitting catalyst performance.
- Developing efficient and durable catalysts is crucial for solar fuel production.
Purpose of the Study:
- To engineer a high-entropy spinel oxide catalyst for solar water splitting.
- To investigate the relationship between entropy, structure, and catalytic function.
Main Methods:
- Synthesized a high-entropy spinel oxide (CuCoNi)(GaCoCrMnFe)2O4.
- Characterized material properties including lattice distortion and dual cobalt sites.
- Evaluated photocatalytic and photoelectrochemical water splitting performance.
Main Results:
- Achieved a photocatalytic HER rate 16.3x higher than Co3O4.
- Delivered high current densities in photoelectrochemical tests (2.03 mA cm−2 in neutral, 7.08 mA cm−2 in alkaline).
- Demonstrated excellent stability with <5% decay over 30 hours.
Conclusions:
- High-entropy engineering effectively breaks the activity-stability trade-off.
- The designed spinel oxide offers a generalizable strategy for durable, high-performance solar fuel catalysts.
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