Novel chemical route for CeO₂/MWCNTs composite towards highly bendable solid-state supercapacitor device

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Development of flexible supercapacitors (SCs) is crucial for portable electronics.
• High capacitance and long-term stability in electrode materials are key challenges.

Purpose of the Study:

• To synthesize a novel nanocomposite for high-performance flexible supercapacitors.
• To enhance electrochemical properties by integrating pseudocapacitive CeO2 nanoparticles with MWCNTs.

Main Methods:

• Coating of cerium oxide (CeO2) nanoparticles onto multi-walled carbon nanotubes (MWCNTs) using chemical bath deposition (CBD).
• Fabrication of a flexible symmetric solid-state supercapacitor (FSSC) device using PVA-LiClO4 gel electrolyte and CeO2/MWCNTs electrodes.

Main Results:

• The CeO2/MWCNTs nanocomposite achieved a specific capacitance of 1215.7 F/g with 92.3% cyclic stability over 10,000 cycles.
• The FSSC device demonstrated a specific capacitance of 486.5 F/g and an energy density of 85.7 Wh/kg.
• The device exhibited low internal resistance and exceptional stability under mechanical stress.

Conclusions:

• The CeO2/MWCNTs nanocomposite is a promising electrode material for flexible supercapacitors.
• The fabricated FSSC shows potential for high-performance energy storage in advanced portable electronic devices.