fig6
Figure 6. (A and B) SEM, (C) TEM, and (D) HR-TEM images of VS4 hierarchical hollow spheres, (E) FE models and (F) the maximum stress of three different structures, (G) rate performance of VS4[77]. (H) SEM, (I) TEM, and (J) HR-TEM images and (K) rate performance of Na2Ti3O7 hollow spheres[78]. (L) SEM and (M) HR-TEM images and (N) rate performance of MoS2/SnS hollow superassemblies (HSs)[79].
