Facile synthesis of paratoluene sulfonic acid assisted S-doped polyaniline hybrid composite for energy storage devices

Abstract

Ternary composites were prepared by varying the weight ratio of the individuals, and their electrochemical performances were recorded by cyclic voltammetry, charging-discharging, and electrochemical impedance spectroscopy. Polyaniline-acetylene black-cobalt ferrite having the weight ratio of 4:1:2 (aniline:acetylene black:cobalt ferrite) gave outstanding electrochemical outputs. The corresponding system (4:1:2 ratio based system) had 294.49 F/g of specific capacitance at 1 mA of current for the two-electrode configuration. It exhibited the maximum coulombic efficiency of 99.1%. Specific energy and power values are the highest for this system, which are 40.9 Wh/kg and 125 W/kg, respectively. It has quite good capacitance retention of 83.5% after 8000 cycles. The charge transfer resistance is only 1 Ω for this system. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.