Figure 2From: Mesoporous TiO2 Nanofiber as Highly Efficient Sulfur Host for Advanced Lithium–Sulfur BatteriesSEM images of the as-spun PVP/TiO2 composite nanofibers: a the lower magnification and b the higher magnification, and after calcination the TiO2 nanofibers: c the lower magnification and d the higher magnificationBack to article page