Figure 12.

a) Schematic illustration for the formation of S‐TTCN composite: 1) Uniform coating a solid SiO₂ layer and a porous SiO₂ layer embedded with C₁₈TMS molecules on MWNTs; 2) formation of porous carbon nanotube by carbonization of C₁₈TMS; 3) etching SiO₂ layers to obtain tube‐in‐tube carbon nanostructure (TTCN) with MWNTs encapsulated within hollow porous carbon nanotube; 4) sulfur infused into TTCN to fabricate S‐TTCN composite. b) Long‐term cycling performance of S‐TTCN electrode at a high rate of 2 A g^–1. c) Discharge‐charge profiles of S‐TTCN at various current densities from 0.5 A g^–1 to 6 A g^–1. Reproduced with permission.163