In this section, some of the applications of WOx materials are presented. Particular emphasis is placed on the enhancements that can be achieved by exploiting the nanostructured forms of WOx. Common applications of WOx include electrochromic, photocatalytic, and gas sensing. These applications have been thoroughly investigated and reported in the literature. The exploitation of WOx for dye-sensitized solar cells, optical data storage and field-emission displays as well as the cation-doped WO3 high-Tc superconductor are also discussed