Fabrication of energy storage EDLC device based on self-synthesized TiO2 nanowire dispersed polymer nanocomposite films

Abstract

In this work, a systematic study of titanium oxide (TiO2) nanowires incorporated polymer nanocomposite (PNC) films prepared by a standard solution cast technique is reported. The structural, morphological, dielectric, and electrochemical properties were investigated thoroughly. The polymer nanocomposite films demonstrated improved electrical and electrochemical properties as compared to polymer�salt complex film. The morphological and structural properties have been examined by the field emission scanning electron microscope, Fourier transform infrared spectroscopy, and X-ray diffraction. It is observed that the maximum ionic conductivity is of the order of 10�5 S cm?1 exhibited by 0.5 wt% nanowire added polymer nanocomposite film. The ion transference number was close to unity for optimized film and stability window of about ~ 5�V. The shift of loss tangent peak toward the high-frequency window with nanowire addition indicates a decrease of the relaxation time. The optimized TiO2 nanowire dispersed polymer nanocomposite film has been used to fabricate the electric double-layer capacitor cells. The fabricated cell demonstrates the specific capacitance of about 57.5 F/g (at 10�mV/s). The calculated energy density and power density are 1.38 Wh kg?1 and 0.709�kW�kg?1, respectively. The Coulombic efficiency is 97.7% up to the 500 cycles for the fabricated cell. The prepared polymer nanocomposite has the potential to use it as electrolyte cum separator for solid-state electric double-layer capacitor applications. � 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.