fig3

Figure 3. (A) TGA patterns of S@CNT, S@O-CNT, and S@SG-CNT; (B) XRD and (C) pore size distribution of CNT, O-CNT, and SG-CNT; (D) N₂ adsorption isotherms of SG-CNT and S@SG-CNT; (E) high-resolution XPS spectra of S 2p of three composites; (F) SEM images of S@SG-CNT; (G) TEM images of S@SG-CNT; and (H-K) STEM image of the representative S@SG-CNT (H) and corresponding C (I), O (J), and S (K) element mapping.