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Development of a 3D Graphene Electrode Dielectrophoretic Device

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Three-dimensional high-aspect-ratio microarray thick electrodes for high-rate hybrid supercapacitors.

Yapeng Zhang¹, Hean Zhu¹, Zeqi Nie¹

¹State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, Hunan, China.

Journal of Colloid and Interface Science

|July 10, 2024

Summary

Researchers developed 3D nickel ordered cylindrical array (NiOCA) electrodes for hybrid supercapacitors (HSCs). These advanced electrodes enhance energy storage for portable electronics, offering improved capacity retention and stability.

Keywords:

High-aspect-ratio microarray High-rate performance Hybrid supercapacitors Thick electrodes

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Traditional thin-film electrodes in hybrid supercapacitors (HSCs) limit energy density.
Increasing electrode thickness causes mechanical instability and inefficient ion/electron transport.
Stable, three-dimensional (3D) ordered thick electrodes are crucial for overcoming these limitations.

Purpose of the Study:

To develop a novel manufacturing process for large-area, high-aspect-ratio 3D ordered thick electrodes.
To construct high-performance hybrid supercapacitors using these advanced electrodes.
To demonstrate the potential for scalable production of 3D electrodes for energy storage.

Main Methods:

Fabrication of 3D nickel ordered cylindrical array (NiOCA) current collectors using lithography and chemical deposition.
Electrodeposition of nickel-cobalt bimetallic hydroxide (NiCo-LDH) onto NiOCA for positive electrodes.
Assembly of HSCs using NiOCA/NiCo-LDH positive electrodes and NiOCA/nitrogen-doped porous carbon (NPC) negative electrodes.

Main Results:

HSCs demonstrated 55% capacity retention across a current density range of 2 to 50 mA cm⁻².
Exceptional long-term cycling stability was observed, with 98.2% capacity retention after 15,000 cycles at 10 mA cm⁻².
The manufacturing process showed customizability and good repeatability.

Conclusions:

The developed manufacturing process enables the creation of 3D ordered thick electrodes for high-performance energy storage.
This approach offers a viable pathway for the large-scale production of advanced electrodes for hybrid supercapacitors.
The study provides innovative concepts for next-generation power sources in portable electronics.