All‐Solid‐State Deformable Hybrid Supercapacitor Based on Porous Self‐Phosphorus‐Doped Bio‐Carbon as a Cathode and MXene‐Modified Doped Metal Oxide as an Anode
Ritik Mohanty, Amtul Nashim, Kulamani Parida
Abstract
Abstract Deformable all‐solid‐state energy storage systems are grabbing significant interest; however, the simultaneous acquisition of high stability alongside high power and energy densities for user‐oriented portable electronics remains a daunting challenge. Thus, hybridizing battery and capacitor materials offers a prospective strategy toward efficiently bridging the performance gap between high‐energy batteries and high‐power supercapacitors. In this work, an all‐solid‐state deformable hybrid supercapacitor (ADHS) utilizing interfacially coupled in situ carbon‐doped zinc cobaltite/MXene (MCZ) as anode and porous self‐phosphorus‐doped bio‐carbon (TAC) derived from Averrhoa carambola leaves as the cathode is presented. The anode delivers high energy via battery‐type storage, while the porous cathode ensures stable, high‐power output over a broad potential window. The ADHS exhibits a specific capacitance of 124.13 F g −1 , energy density of 119.16 Wh kg −1 , and power density of 3139.53 W kg −1 , with 90.55% initial capacitance retention post 20 000 cycles, outperforming or matching state‐of‐the‐art storage devices. Furthermore, the device maintains electrochemical stability under 100 deformation cycles and various twisting angles, highlighting its promise for next‐generation energy storage applications.