From Biopolymers to Power: Nanotitania Functionalized Cellulose Acetate Free‐Standing Membranes for Supercapacitors

The current study intends to provide new insights into the use of titanium dioxide nanoparticles incorporated into cellulose acetate membranes as electrodes for supercapacitors. By employing numerous performances, such as Fourier transform infrared spectroscopy, X‐ray diffraction, scanning electron microscopy, and a universal testing machine, the physicochemical properties of the formulated membranes are analyzed. The electrochemical properties are estimated through cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge–discharge techniques. Among the membranes studied, the one with 1.0 wt% titanium dioxide in cellulose acetate exhibits the best electrochemical performance, achieving the highest specific capacitance of 98.15 F g −1 at a current density of 0.1 A g −1 , a peak energy density of 23.03 Wh kg −1 , and the highest power density of 1040 W kg −1 . The cycle tests reveal notable retention in capacitance of 88% after 5000 continuous cycles, indicating its suitability for large‐scale flexible supercapacitor devices in industrial applications.