Dual Functional Nanostructured Nickel Electrodes on Anodic Alumina for Energy Storage Applications

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Developing advanced electrode materials is crucial for next-generation energy storage devices.
• Nickel-based nanostructures offer potential for electrochemical applications due to their unique properties.

Purpose of the Study:

• To fabricate nickel-based nanorod electrodes with dual supercapacitive and faradaic electrochemical functionality.
• To investigate the impact of nanostructural design on electrochemical performance for energy storage.

Main Methods:

• Utilized nanoporous anodic alumina (NAA) templates and pulsed electrodeposition for nanorod fabrication.
• Engineered two distinct electrode configurations: Ni nanorods in NAA (Ni-NR@NAA) and free-standing Ni nanorods (Ni-R-NR@NAA).
• Characterized nanostructures using field-emission scanning electron microscopy (FESEM) and evaluated electrochemical performance via cyclic voltammetry (CV).

Main Results:

• Ni-NR@NAA electrodes exhibited pseudocapacitive behavior with a capacitance per unit area of 104 mFcm⁻², nearly seven times higher than flat electrodes.
• Specific capacitance reached up to 60 Fg⁻¹ at low scan rates, attributed to increased surface area and ion transport.
• Ni-R-NR@NAA electrodes showed predominantly capacitive behavior with modified redox activity.

Conclusions:

• Nanostructural design critically influences the electrochemical performance of nickel-based electrodes.
• The fabricated electrodes offer a versatile platform for dual supercapacitive and faradaic energy storage applications.
• This work provides insights into tailoring nanostructures for optimized electrochemical energy storage.