fig3

Figure 3. Electrochemical and rectification performances of polymer electrolyte–based CAPode. (A) Schematic structure of flexible CAPode; (B) CV curves at different scan rates; (C) RR_I at different scan rates; (D) GCD curves at different charge/discharge current densities; (E) RR_II and specific capacitance at different current densities; (F-I) O 1s (F and G) and Mo 3d (H and I) XPS spectra of MoO_x electrode at fully charged and discharged states; (J) Cycling stability of CAPode at 2 A g^-1; (K) Performance comparison of CAPode with other reported CAPodes and ionic diodes. CV: Cyclic voltammetry; RR_I: rectification ratio I; GCD: galvanostatic charge–discharge; RR_II: rectification ratio II; XPS: X-ray photoelectron spectroscopy; AC: active carbon; CNTs: carbon nanotubes; PVA: polyvinyl alcohol.