Performance Evaluation of Binder‐Free Castor Oil‐Derived Carbon Soot Electrodes for Supercapacitor Application

The present study unveils a novel approach in the facile fabrication of carbon soot‐based electrodes for supercapacitor application. We utilize castor oil as a precursor material, a unique choice that has not been explored in this context. The soot derived from castor oil, with a major carbon composition of 95.5%, has a specific surface area of 114.99 m 2 g −1 . This work delves into the structural characteristics and electrochemical performance of the castor oil‐derived soot‐based electrodes for supercapacitors. The carbon soot electrode‐based symmetric electric double‐layer capacitor exhibits a specific capacitance of 50 F g −1 at 0.5 A g −1 , with a remarkable capacitance retention of 95% and a columbic efficiency of 97% over 2000 cycles with excellent cyclic stability. It also has a high energy density of 4.44 W h kg −1 at a power density of 400 W kg −1 . This study not only sheds light on the viability of castor oil‐derived soot as a cost‐efficient and sustainable material for supercapacitor technology but also introduces a new perspective by examining the effect of soot on the device's capacitance, charge–discharge properties, and overall efficiency.