fig3

Figure 3. (A) Structure of TiO₂ NP-PG; (B) Working mechanism of TiO₂ NP-PG; (C) Discharging (circle)/charging (square) specific capacities of TiO₂ NP-PG (blue) and TiO₂ NP (green) at different current densities along with the CE (black). (D) Schematic illustration of the formation and TEM images of SnO₂@C-HTs; (E) Cycling performance of SnO₂@C-HTs and SnO₂ without ultra-thin carbon coatings; (F) Rate capacities of SnO₂@C-HTs and SnO₂ without ultra-thin carbon coatings; (G) Three-dimensional structure of Si pomegranate; (H) SEM images of Si pomegranate; (I) Reversible capacities for 1,000 cycles of the Si pomegranate and other structures tested at C/2. (A-C) are quoted with permission from Lee et al.^[59]; (D-F) from Zhang et al.^[68]; and (G-I) from Liu et al.^[69].