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Related Concept Videos

MOS Capacitor01:25

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...

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A Designed High-Entropy Sulfide-Based Nanoporous Heterojunction for Fast, Durable, and High-Capacity Sodium Storage.

Naixuan Ci1, Xianke Yue2, Yinghe Zhang3

  • 1School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China.

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|December 26, 2025
PubMed
Summary

High-entropy engineering creates a novel senary (AlCrCo)NiFeS2/MnS heterojunction for sodium ion battery anodes. This material achieves a record capacity and excellent stability, paving the way for advanced energy storage solutions.

Keywords:
electronic structure regulationheterojunctionhigh entropysynergistic interaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Transition metal sulfide (TMS)-based heterojunctions are promising anodes for sodium ion batteries (SIBs).
  • Existing TMS anodes face challenges including sluggish kinetics, low capacity, and poor structural stability.
  • Developing advanced anode materials is crucial for improving SIB performance.

Purpose of the Study:

  • To design and synthesize a novel senary high-entropy heterojunction for SIB anodes.
  • To investigate the impact of high-entropy engineering on the electrochemical performance of TMS-based anodes.
  • To explore the potential of nanoporous structures and hard carbon coatings for enhanced SIB anode properties.

Main Methods:

  • Synthesis of a nanoporous senary (AlCrCo)NiFeS2/MnS high-entropy heterojunction using dealloyed senary oxide precursors.
  • Characterization of the material's structure and properties, including high-entropy engineering, built-in electric field, and hard carbon coating.
  • Electrochemical testing of the heterojunction as an anode material in sodium ion batteries, including cycling performance and rate capability.
  • Density Functional Theory (DFT) calculations to elucidate the electronic structure and ion adsorption mechanisms.

Main Results:

  • The senary (AlCrCo)NiFeS2/MnS heterojunction achieved a record high capacity of 885.5 mAh g⁻¹ after 110 cycles at 0.1 A g⁻¹.
  • Excellent long-term cycling stability was demonstrated, with a capacity of 331.5 mAh g⁻¹ retained after 4000 cycles at a high rate of 40.0 A g⁻¹.
  • DFT calculations confirmed that high-entropy engineering modifies the electronic structure, enhancing electronic conductivity and sodium ion adsorption compared to ternary counterparts.

Conclusions:

  • High-entropy engineering is an effective strategy for developing advanced SIB anodes with superior performance.
  • The designed nanoporous senary heterojunction exhibits remarkable capacity and stability, addressing key limitations of current TMS-based anodes.
  • This work demonstrates significant potential for high-entropy materials in next-generation sodium ion battery technology.