fig5

Figure 5. The investigations of energy storage mechanism based on cathodes and anodes. (A) FT-IR and (B) the fitted high-resolution N 1s spectra under pristine, fully charged/discharged state. (C) FT-IR and (D) Raman characterizations of cathodes at different states. (E) The working mechanism of the full battery system. (F) One coin battery is able to light the LED and successfully charge the smartwatch.