fig1

Figure 1. Schematic mechanism of the (A) Se@ZIF-8-C, (B) ZIF-8-C@MWCNTs-1 and (C) Se@ZIF-8-C@MWCNTs-5 electrodes for lithium ion and electron movement. (D) Cycling performance of Se@ZIF-8-C and Se@ZIF-8-C@MWCNTs-3 at high current density of 1 C, (E) summary of the specific capacity and impedance of the Se@ZIF-8-C@MWCNTs-X (X = 1-5) positive electrodes according to the particle size of the internal ZIF-8 derived porous carbon.