Fig. 3. Structural design of an F-SC.

(A) Schematic diagram and (B) photograph (scale bar, 1 cm) of a single F-SC, consisting of two carbon fibers coated with RuO₂·xH₂O in the H₃PO₄/PVA electrolyte. (C) Low-magnification and (D) high-magnification SEM images of the RuO₂·xH₂O–coated carbon fiber electrode [scale bars, 100 μm (C) and 5 μm (D)]. (E) CV of the single F-SC at different scanning rates (10 to 100 mV/s). (F) GCD curve of a single F-SC at different current densities (100 to 1000 μA). (G) Cycling performance of a single F-SC unit. (H) CV curves of the single F-SC at different bending angles (0° to 180°).