Investigating the Influence of Reflux Condensation Reaction Temperature on the Growth of FeCo <sub>2</sub> O <sub>4</sub> Thin Film for Flexible Supercapacitor
Gokul P. Kamble, Anil A. Kashale, Akash S. Rasal, Suraj Dengale, Sanjay S. Kolekar, Jia Chang, Sung‐Hwan Han, Anil V. Ghule
Abstract
Abstract Metal oxides are at the forefront for supercapacitors (SCs) applications considering their unique properties like rapid charge transport and ability to provide more active sites. In this respect, FeCo 2 O 4 nanostructures with varying morphology are designed by reaction temperature variations (80, 100, 120, and 140 °C) in facile reflux condensation synthesis. These different structures are grown onto the flexible stainless‐steel mesh (FSSM) and investigated as an electrode in SCs. FeCo 2 O 4 prepared at 120 °C shows good electrochemical performance and offers 106.85 m 2 /g specific surface area, 0.1531 cc/g pore volume, and demonstrate hierarchical mesoporous construction. FeCo 2 O 4 nanoflakes demonstrate 260 F g −1 specific capacitance at 1 mA cm −2 and 96.16 % retention of capacitance (over 1000 cycles) supporting considerable cycle stability. The asymmetric supercapacitor (ASC) device demonstrates 15.27 Wh kg −1 energy density and promising charge‐discharge stability (80 % retention up to 2000 cycles).