fig6

Figure 6. (A) Digital photograph of a flexible FGH thin film electrode. (B) low- and (C) high- magnification SEM images of interior microstructures of the FGH film. (D) Digital photograph of an FGH-based flexible solid-state supercapacitor. (E) A schematic diagram of the solid-state device with H₂SO₄-PVA polymer gel as the electrolyte and separator. (F) Cyclic voltammetry (CV) curves at 10 mV s^-1 of the FGH-based flexible solid-state supercapacitor at different bending angles. (G) One cycle of galvanostatic charge-discharge (GCD) curves at 1 A g^-1 of a three-supercapacitor in-series group. The inset shows a photograph of a green LED turned on by the tandem device^[61].