jabbrv-ltwa-all.ldf jabbrv-ltwa-en.ldf This study presents a high-performance ultralight carbon aerogel (denoted as PFSCA) synthesized via hydrothermal self-assembly, solvent exchange, and carbonization. Compared to passion fruit shell-derived carbon (PFSC) produced by direct pyrolysis, PFSCA exhibits a significantly lower packing density (0.056 g cm⁻³ vs. 0.210 g cm⁻³ for PFSC). Despite its reduced specific surface area (SSA: 455 m² g⁻¹ vs. 1485 m² g⁻¹ for PFSC), PFSCA achieves a comparable specific capacitance (167 F g⁻¹ vs. 170 F g⁻¹ for PFSC) and superior electrochemical performance. These enhancements are attributed to PFSCA’s unique structural and chemical features: (1) helical hollow tubes and surface nanospheres that shorten ion diffusion pathways, (2) a high degree of graphitization with enlarged d₀₀₂ interlayer spacing (0.38 nm vs. 0.35 nm for PFSC), and (3) surface-functional C=O and -COOH groups that improve hydrophilicity and charge transfer. A flexible symmetric supercapacitor (FASSC) fabricated with PFSCA electrodes operates at a 2.0 V voltage window, delivering an energy density of 30.6 Wh kg⁻¹ at 2000 W kg⁻¹. The FASSC retains 100% Coulombic efficiency over 6,000 cycles and demonstrates exceptional mechanical flexibility under bending angles of 0–180°. This work provides a cost-effective and scalable strategy for carbon aerogel synthesis, highlighting their potential for advanced flexible energy storage applications.