Polyaniline-Stabilized Intertwined Network-like Ferrocene/Graphene Nanoarchitecture for Supercapacitor Application

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Metallocenes, specifically ferrocene (Fc), exhibit H-π interactions with graphene.
• Polyaniline (PANI) can stabilize these interactions via π-π interactions, forming nanocomposites.
• These nanocomposites are explored for advanced energy storage applications.

Purpose of the Study:

• To synthesize and characterize a polyaniline-stabilized ferrocene@graphene nanocomposite (FcGA).
• To investigate the H-π and π-π interactions between ferrocene, graphene, and polyaniline.
• To evaluate the energy storage performance and stability of the FcGA nanocomposite.

Main Methods:

• Synthesis of polyaniline-stabilized ferrocene@graphene nanocomposite (FcGA).
• Characterization of morphology, surface area, and porosity.
• Theoretical calculations using Density Functional Theory (DFT) to assess component interactions.
• Electrochemical testing including galvanostatic charging/discharging and electrochemical impedance spectroscopy (EIS).

Main Results:

• FcGA exhibited an intertwined network morphology with high surface area and porosity.
• DFT calculations confirmed effective H-π interactions between Fc and graphene, stabilized by PANI.
• The nanocomposite achieved a maximum specific capacitance of 960 F/g at 1 A/g.
• EIS analysis revealed low internal resistance and improved charge transfer.
• The material demonstrated excellent stability, retaining 86% capacitance after 5000 cycles.

Conclusions:

• The PANI-stabilized Fc@graphene nanocomposite is a highly effective material for energy storage applications.
• The synergistic interactions between Fc, graphene, and PANI enhance electrochemical performance.
• The material's high capacitance, low resistance, and durability indicate its potential for practical energy storage devices.