fig1

Figure 1. (A) Schematic synthesis routes of ZIF-8-C@MWCNTs-X, (B) tuning of the size of ZIF-8 for a series of ZIF-8-C@MWCNTs-X (X = 1-5) and (C) synthesis the final selenium-confined composites of Se@ZIF-8-C, 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, respectively.