Water plasma functionalized CNTs/MnO2 composites for supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Vertically-aligned multiwall carbon nanotubes (CNTs) are synthesized via plasma-enhanced chemical vapor deposition.
• Surface functionalization and purification are crucial for enhancing CNT electrochemical properties.
• Improving charge storage capability is key for advanced capacitor devices.

Purpose of the Study:

• To investigate the effects of water plasma treatment on CNTs.
• To enhance the electrochemical properties and charge storage of CNTs.
• To explore the role of manganese dioxide deposition and morphology in capacitor performance.

Main Methods:

• Water plasma treatment of vertically-aligned multiwall carbon nanotubes (CNTs).
• Anodic deposition of manganese dioxide (MnO2) onto plasma-treated CNTs.
• Characterization of manganese oxide morphology and oxidation states under varying voltage windows during charge-discharge measurements.

Main Results:

• Water plasma treatment functionalized and purified CNTs, improving their electrochemical properties.
• Anodic deposition of MnO2 on plasma-treated CNTs increased charge storage capability.
• The morphology and oxidation state of manganese oxide influenced capacitor device efficiency.
• Specific capacitance increased from 678 Fg(-1) for untreated CNTs to 750 Fg(-1) for water plasma-treated CNTs.

Conclusions:

• Water plasma treatment is an effective method for enhancing CNTs for electrochemical applications.
• MnO2/CNTs nanocomposites show significant potential for high-performance supercapacitors.
• Control over manganese oxide morphology is critical for optimizing energy storage performance.