Raw data used for all analysis in the manuscript entitled: 'Triboelectric Capacitance Supplementation in Energy Storage Composites with Functionalized Carbon Fiber Electrodes'

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Structural supercapacitors that use carbon fiber (CF) electrodes can both bear loads and store energy. By surface‑functionalizing the CFs and pairing them with electrospun polymer nanofiber separators, triboelectric charge is generated at the CF-separator interface, which boosts capacitance when the material is mechanically deformed. Desized CF gives the strongest instantaneous current but discharges quickly, whereas chemically‑tailored CFs provide stable triboelectric charging and higher capacitance. Adding a hybrid piezoelectric-triboelectric layer (e.g., Si-functionalized CF with a PVDF-TrFE separator) further enhances charge separation, achieving charge densities around 20 µC m⁻² and supporting higher voltages. This hybrid triboelectric-piezoelectric approach advances self‑powered, load-bearing components for aerospace, automotive, and wearable applications.