Enhancing sodium-ion storage in lignin-based ultrafine carbon fibers via single-walled carbon nanotube reinforcement and mild phosphoric acid activation

Key Points

• Enhanced sodium-ion storage reached 250 mAh g-1 with activated carbon fibers and nanotube reinforcement, showcasing notable performance.
• The study indicates that mild phosphoric acid activation significantly boosts the electrochemical properties of the fibers.
• Utilizing single-walled carbon nanotubes effectively increases the conductivity of the lignin-based carbon fibers.
• Findings suggest that this technique could lead to more efficient energy storage solutions, with applications in batteries.