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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
Published on: April 8, 2018
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Ultrastable and High-Rate Sodium Storage Enabled by High-Entropy Doping in HE-Fe3Se4/Se/MXene Composites
Lei Luo1, Wei Yin1,2, Lianyi Shao1
1School of Materials and Energy, Guangdong University of Technology, Guangzhou, Guangdong, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|January 8, 2026
Summary
High-entropy iron selenide and MXene composites enhance sodium-selenium battery performance by suppressing polyselenide shuttle and boosting kinetics. This novel cathode material offers exceptional capacity retention and long-term stability for advanced energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sodium-selenium (Na-Se) batteries face challenges like polyselenide shuttle and slow reaction kinetics, limiting their performance.
- Developing high-performance cathodes is crucial for advancing Na-Se battery technology.
Purpose of the Study:
- To engineer a novel composite cathode material for high-performance Na-Se batteries.
- To address the shuttle effect and sluggish kinetics hindering Na-Se battery development.
Main Methods:
- Synthesized a composite cathode by in situ growth of high-entropy Prussian blue analogue on MXene, followed by selenization, creating HE-Fe3Se4/Se/MX.
- Confined selenium within a catalytic host of high-entropy iron selenide and MXene.
Main Results:
- The HE-Fe3Se4/Se/MX composite exhibited a specific capacity of 512 mAh g-1 at 0.1 A g-1, retaining 330 mAh g-1 at 30 A g-1 (64.4% retention).
- Achieved remarkable long-term stability with 337 mAh g-1 after 1000 cycles at 10 A g-1, showing an ultralow decay rate of 0.0106% per cycle.
Conclusions:
- The synergistic integration of high-entropy engineering and conductive MXene scaffolding effectively suppresses polyselenide shuttle and enhances reaction kinetics.
- This strategy provides a promising pathway for developing durable, high-rate cathodes for advanced sodium-selenium batteries and other energy storage systems.
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