High performance energy storage applications of polyaniline based functionalized multi walled carbon nanotubes nanocomposites

Abstract

Nanocomposites with conducting polymer exhibit high dielectric and electrochemical properties for highperformance energy storage applications. The present work involves the development of PANI/Al2O3 and PANI/Al2O3@f-MWCNT ternary nanocomposites via in situ polymerisation technique. The enhanced dielectric properties of the nanocomposites indicate improved charge storage capability, directly supporting their superior electrochemical energy storage performance. The highest dielectric constant of 7.73 x 104 is obtained at 1 kHz and 145 degrees C with a minimal dielectric loss of 2.11 at 1 kHz and 25 degrees C for PANI/Al2O3 binary nanocomposite. The maximum ac conductivity of 3.2 x 10-2 S/m is found at 1 kHz and 205 degrees C for binary nanocomposite. The enhanced dielectric constant of 2.18 x 106 with a minimal dielectric loss of 0.91 is observed at 1 kHz and 345 degrees C, respectively, for PANI/Al2O3@f-MWCNT ternary nanocomposite. The highest ac conductivity of 1.11 x 10-1 S/ m is found at 1 kHz and 345 degrees C for the ternary nanocomposite. The fabricated device of PAAM-5 nanocomposite exhibits excellent Csp of 442 F/g at 10 mV/s. The maximum energy density value of 70.28 Wh/kg is calculated at a power density of 2431.02 W/kg. The designed device has gained capacitance retention of 100 % even after 5 k cycles. The combination of improved surface area, high dielectric constant, specific capacitance, energy density, and low dielectric loss indicates the potential application of high performance energy storage applications.