Sustainable Organic Routes to Activated Carbon and Fluoropolymer Membranes for Supercapacitor Applications

The growing demand for flexible, sustainable, and multifunctional energy storage systems has spurred interest in low‐cost, biomass‐derived materials for next‐generation supercapacitors (SCs). This study presents a sustainable organic route to fabricate activated carbon (AC) from jute sticks and a fluoropolymer membrane based on PVDF‐HFP, targeting dual applications in piezoelectric and aqueous asymmetric SC configurations. In the self‐charging system, jute‐derived AC is employed as both electrodes, while the PVDF‐HFP membrane functions simultaneously as a separator and a piezoelectric energy harvester. For the asymmetric configuration, the AC serves as the negative electrode, paired with a Ni‐based metal–organic framework (Ni‐MOF) as the positive electrode, demonstrating the versatility of the biomass‐derived carbon in hybrid energy storage systems. The piezoelectric SC achieves an areal capacitance of 72 mF/cm 2 and effectively converts mechanical energy into electrical energy under applied pressure. Meanwhile, the asymmetric device delivers an areal capacitance of 117 mF/cm 2 , showcasing enhanced charge storage and energy delivery. This dual‐application approach highlights the multifunctional potential of jute‐derived carbon and fluoropolymer membranes, offering a scalable and environment‐friendly pathway for the development of autonomous, self‐powered, and portable electronic systems.