fig6

Figure 6. Schematic mechanism of the electrodes for lithium ion and electron movement: (A) Se@ZIF-8-C; (B) ZIF-8-C@MWCNTs-1; and (C) Se@ZIF-8-C@MWCNTs-5. Nyquist plots of Se@ZIF-8-C@MWCNTs-X (X = 1-5) electrode measured when fresh (D) and after 100 cycles with 0.2 C (E).