Flexible 3D core-shell nanoforest arrays trimetal electrode for high capacitance supercapacitor

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• High capacitance in supercapacitors relies on advanced nanostructure design and material hybridization.
• Developing efficient electrodes is crucial for advancing flexible energy storage solutions.

Purpose of the Study:

• To design and synthesize 3D core-shell nanoforest arrays for high-performance supercapacitor electrodes.
• To investigate the electrochemical properties and stability of the novel electrode material.

Main Methods:

• Fabrication of hierarchical 3D core-shell nanoforest arrays (Mo-Co-Ni(nanotube)@Ni-Co(nanosheet)) on carbon cloth via a two-step hydrothermal method and electrodeposition.
• Electrochemical characterization, including cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy.
• Assessment of long-term cycle stability.

Main Results:

• The synthesized Mo-Co-Ni(nanotube)@Ni-Co(nanosheet) arrays exhibit a large specific surface area, abundant pores, and active sites.
• The electrode achieved a high areal capacitance of 9.81 F cm⁻² (1998.0 F g⁻¹) at 1 mA cm⁻².
• Demonstrated excellent long-term cycle stability, retaining 85.4% of its highest capacitance after 3000 cycles.

Conclusions:

• The 3D core-shell nanoforest array structure effectively enhances electrolyte penetration and ion diffusion, leading to superior electrochemical performance.
• This study presents a promising strategy for designing flexible supercapacitor electrode materials with high energy density and stability.