Flexible Nitrogen Doped SiC Nanoarray for Ultrafast Capacitive Energy Storage

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Current portable electronics face challenges in energy storage, particularly in improving supercapacitor (SC) energy/power densities and cyclability cost-effectively.
• Enhancing SC performance at ultrafast rates while maintaining environmental friendliness and operation in harsh conditions remains difficult.

Purpose of the Study:

• To fabricate quasi-aligned, nitrogen-doped 3C-silicon carbide nanowire (3C-SiCNW) arrays on flexible carbon fabric for advanced supercapacitors.
• To investigate the impact of nitrogen doping on the electrochemical performance of SiCNW-based supercapacitors.

Main Methods:

• Chemical vapor deposition (CVD) to grow large-scale, quasi-aligned single crystalline 3C-SiCNW arrays on flexible carbon fabric.
• Fabrication of all-solid-state flexible textile-based supercapacitors (TSCs) using the developed SiCNW electrodes.
• Electrochemical characterization to evaluate capacitance, power density, energy density, rate capability, and cyclability.

Main Results:

• Nitrogen doping significantly enhanced SC performance by improving quantum capacitance, bulk capacitance, and high-power capability.
• Achieved areal capacitances of 4.8 mF cm⁻² in aqueous and 4.7 mF cm⁻² in gel electrolytes.
• Demonstrated robust mechanical stability under bending and twisting, with high power density (72.3 mW cm⁻²) and energy density (1.2 × 10⁻⁴ mW·h cm⁻²).
• Enabled ultrahigh rate operations up to 30 V s⁻¹, surpassing conventional supercapacitors and comparable to 1D nanostructure materials like CNTs and graphene.

Conclusions:

• Nitrogen-doped SiCNW arrays on flexible carbon fabric represent a promising material for high-performance, flexible textile-based supercapacitors.
• The developed TSCs offer a cost-efficient, environmentally friendly solution for energy storage in demanding applications, including flexible electronics.
• The enhanced electrochemical properties and mechanical robustness position these devices as competitive alternatives to existing 1D nanostructure-based energy storage systems.