3D Interconnected Binder-Free Electrospun MnO@C Nanofibers for Supercapacitor Devices

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• High-performance supercapacitors require binder-free electrode materials with superior cyclic stability and conductivity.
• Developing efficient synthesis methods for such materials is crucial for advancing energy storage technologies.

Purpose of the Study:

• To demonstrate a facile one-step synthesis of binder-free MnO@C nanofibers for supercapacitor electrodes.
• To evaluate the electrochemical performance and stability of these novel electrodes.
• To assess the performance of an asymmetric supercapacitor utilizing these electrodes.

Main Methods:

• One-step synthesis of MnO@C nanofibers via electrospinning.
• Material characterization using Field Emission Scanning Electron Microscopy (FESEM), High-Resolution Transmission Electron Microscopy (HRTEM), X-ray Photoelectron Spectroscopy (XPS), and X-ray Diffraction (XRD).
• Electrochemical performance testing, including specific capacitance, cycling stability, and assembly of an asymmetric supercapacitor.

Main Results:

• Successful synthesis of binder-free MnO@C nanofibers confirmed by FESEM, HRTEM, XPS, and XRD.
• Achieved a high specific capacitance of 578 F/g at 1 A/g.
• Demonstrated remarkable cycling performance with a 127% capacity increase after 3000 cycles.
• An asymmetric supercapacitor achieved an energy density of 35.5 Wh/kg at a power density of 1000 W/kg, with superior coulombic efficiency, cycle life, and capacity retention.

Conclusions:

• The facile one-step synthesis provides a promising route to binder-free MnO@C nanofibers for high-performance supercapacitors.
• The MnO@C nanofibers exhibit excellent electrochemical properties, including high capacitance, exceptional stability, and significant capacity retention.
• The asymmetric supercapacitor demonstrates the potential of these materials for advanced energy storage applications.