Nitrogen-doped carbons derived from cotton pulp for improved supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Supercapacitors offer rapid charge/discharge, long lifespan, and stability, but cost-effective carbon electrodes have limitations.
• Existing carbon-based electrodes suffer from low specific capacitance and insufficient stability, hindering their widespread use in energy storage.

Purpose of the Study:

• To enhance the specific capacitance and stability of carbon-based electrodes for supercapacitors.
• To develop a novel, cost-effective nitrogen-doped carbon material derived from sustainable sources.

Main Methods:

• Preparation of nitrogen-doped carbons by carbonizing a mixture of cotton pulp (CCP) and melamine.
• Integration of pore and surface modification with defect engineering during the carbonization process.
• Characterization of structural and morphological features using various techniques.

Main Results:

• The nitrogen-doped CCP (CCPN1) exhibited a specific capacitance of 642 F g⁻¹ at 0.5 A g⁻¹.
• This performance surpasses reported carbon analogues and most metal-based materials.
• CCPN1 maintained over 150 F g⁻¹ at 2 A g⁻¹ for over 5000 cycles, demonstrating excellent stability.

Conclusions:

• Nitrogen-doped carbons derived from cotton pulp offer significantly improved specific capacitance and stability.
• This material presents a promising, cost-effective alternative for advanced energy storage applications.