TiO2, as a typical species of semiconductor oxide, has been widely applied in photocatalysis, mesoporous membranes, solar cells, etc. Considering their large specific surface area as well as surface/ interface effects, electrospun TiO2 nanofibers possess superior performance in various fields. In 2003, Li and Xia successfully prepared electrospun TiO2 nanofibers by employing PVP/ethanol/titanium tetraisopropoxide as a precursor solution system. The diameter and the porous structure of the obtained
TiO2 nanofibers can be controlled by varying diverse parameters during the electrospinning process (Fig. 3.9) (Li and Xia, 2003). Since then, various solvent systems have been used to produce TiO2 nanofibers with different kinds of structure (Madhugiri et al., 2004; Albetran et al., 2016; Ding et al., 2004). Furthermore, numerous works have been reported with regard to the applications of electrospun TiO2 nanofibers (Chuangchote et al., 2009; Hou et al., 2017; He et al., 2013a, 2016; Zhou et al., 2017; Zhao et al.