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In-Situ Ni Leaching Induced the Formation of Amorphous High-Entropy Layered Hydroxides for Boosting the Oxygen
Ziqi An1, Yuan Ha1, Yingyan Ma1
1School of Advanced Materials and Nanotechnology, Xidian University, Xi'an, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 10, 2026
Summary
A novel high-entropy layered double hydroxide (HE-LDH) electrocatalyst demonstrates superior activity and stability for oxygen evolution reactions (OER). This breakthrough offers new avenues for efficient energy conversion and storage technologies.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Designing efficient electrocatalysts for oxygen evolution reactions (OER) requires balancing activity, stability, and cost.
- Current research often prioritizes OER activity and cost reduction, with less focus on enhancing catalytic stability.
- Systematic strategies for improving the stability of OER catalysts are still underexplored.
Purpose of the Study:
- To synthesize and evaluate a high-entropy layered double hydroxide (HE-LDH) catalyst for enhanced OER performance.
- To investigate the impact of high-entropy design and multi-elemental synergy on catalytic stability and activity.
- To provide new insights into advanced high-entropy materials for energy conversion applications.
Main Methods:
- In situ synthesis of a high-entropy layered double hydroxide (CoNiFeCrRu@NF, HE-LDH@NF) on nickel foam (NF) using Ru3+-induced Ni2+ dissolution.
- Electrocatalytic testing of the synthesized HE-LDH@NF for OER in 1.0 M KOH.
- Comparative performance analysis against quaternary counterparts and other analogs.
Main Results:
- The synthesized HE-LDH@NF catalyst exhibited significantly improved OER performance compared to quaternary and other catalysts.
- Achieved a low overpotential of 256 mV at 100 mA cm-2 and a Tafel slope of 49.6 mV dec-1.
- Demonstrated excellent long-term stability, maintaining performance over 100 hours without decay.
Conclusions:
- High-entropy design is an effective strategy for developing highly active and stable OER electrocatalysts.
- The synergistic effects of incorporating multiple elements in HE-LDHs significantly boost OER performance.
- This study offers valuable perspectives for applying advanced high-entropy materials in energy conversion and storage systems.
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