fig5

Figure 5. (A) Se mass-normalized CV curves of Se@ZIF-8-C@MWCNTs-3 at first four cycles. (B) The cycling performance and corresponding coulombic efficiency of Se@ZIF-8-C, Se@ZIF-8-C@MWCNTs-1, and Se@ZIF-8-C@MWCNTs-3. (C) The charge and discharge curves at different cycles of Se@ZIF-8-C@MWCNTs-3. (D) Rate capability of Se@ZIF-8-C, Se@ZIF-8-C@MWCNTs-1, and Se@ZIF-8-C@MWCNTs-3. (E) CV curves of Se@ZIF-8-C and Se@ZIF-8-C@MWCNT-3 in the fourth cycle. (F) The cycling performance and (G) rate capability of Se @ZIF-8-C@MWCNTs-1, Se@ZIF-8-C@MWCNTs-2, Se@ZIF-8-C@MWCNTs-3, Se@ZIF-8-C@MWCNTs-4, and Se@ZIF-8-C@MWCNTs-5. (H) Cycling performance of Se@ZIF-8-C and Se@ZIF-8-C@MWCNTs-3 at a high current density of 1 C.