fig4

Figure 4. The mechanical flexibility and stability of CAPode based on PVA/H₃PO₄ hydrogel electrolyte. (A) Photographs by a digital camera of flexible CAPode under different bending angles; (B-D) CV curves (B) at a scan rate of 20 mV s^-1, GCD curves at a current density of 1 A g^-1 (C), and Nyquist plots (D) of one CAPode under different bending angles; (E-G) CV curves (E) at a scan rate of 20 mV s^-1, GCD curves (F) at a current density of 1 A g^-1, and Nyquist plots curves (G) of one N–CAPode being bent to 180 for different cycles. PVA: Polyvinyl alcohol; CV: cyclic voltammetry; GCD: galvanostatic charge–discharge.