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Amorphous/polycrystalline NiMn selenide for high-performance supercapacitors.

Lun-Qiang Tang¹, Kai Zhang¹, Hong-Yan Zeng¹

¹College of Chemical Engineering, Xiangtan University, Xiangtan 411105, Hunan, China.

The Journal of Chemical Physics

|August 22, 2024

Summary

Researchers developed a novel amorphous/crystalline heterostructure using transition-metal selenides for supercapacitors. This engineered material enhances redox reaction kinetics, leading to improved energy storage performance and longer cycle life.

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Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Transition-metal selenides are promising electrode materials for supercapacitors.
Engineering amorphous/crystalline heterostructures can enhance active sites and accelerate redox reaction kinetics.
Exploration of such heterostructures for supercapacitors remains limited.

Purpose of the Study:

To design and construct an amorphous/crystalline heterostructure for supercapacitor applications.
To investigate the synergistic effects of multi-components and heterophase structures on electrochemical performance.
To evaluate the potential of the developed material in practical energy-storage devices.

Main Methods:

Fabrication of an amorphous/crystalline heterostructure via selenization of a NiMnS self-sacrificial template.
Phase transformation from metal sulfide to metal selenide to form amorphous Mn/polycrystalline Ni0.85Se-NiSe2 heterophase.
Electrochemical characterization of the material in supercapacitor devices.

Main Results:

The optimal NiMnSe material demonstrated a high specific charge of 1389.1 C g-1 at 1 A g-1.
The material exhibited excellent rate capability and an impressive lifespan with 88.9% retention.
The NiMnSe//activated carbon device achieved a long cycle life and an energy density of 48.0 W h kg-1 at 800 W kg-1.

Conclusions:

The designed amorphous/crystalline heterostructure effectively enriches electron/ion transport channels and active sites.
The synergistic effects accelerate electron/ion transfer and Faradaic reaction kinetics.
The developed NiMnSe material shows significant potential for practical electrochemical energy-storage devices.