Enhanced Electrochemical and Dielectric Properties of rGO–TiO₂ Modified PTh/PEO Nanofibers Synthesized by Electrospinning
J. Environ. Nanotechnol., Volume 15, No 1 (March 2026) pp. 212-224
Abstract
Influence of reduced graphene oxide (rGO) and nanoparticles (NPs) of titanium dioxide (TiO2) as additions on polythiophene (PTh)/polyethylene oxide (PEO) nanofibers has been investigated in this study by employing an electrospinner. The alternate electrical conductance and dielectric characteristics were assessed as functions of temperature (30 – 100 ℃) and frequency (1 – 200 kHz) for PTh/PEO/rGO/xTiO2 (x = 0, 0.0015, 0.003, 0.0045, 0.006) nanofiber. Dielectric properties show TiO2 NPs improved both the conductivity and dielectric constant, while simultaneously decreasing dielectric loss. The electrochemical performance was evaluated by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy in a 1 M KOH solution. The improved composite demonstrated an areal capacitance of 408.35 mF cm-2 and maintained 93.06% capacitance after 10,000 cycles. The enhanced performance is ascribed to the synergistic interaction between rGO and TiO2 nanoparticles, which facilitate charge transfer and electrolyte diffusion. The results suggest that PTh/PEO/rGO/TiO2 nanofibers are viable materials for supercapacitor electrodes and dielectric applications.
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