TiO_2-WO_3 hybrid photocatalysts were prepared using wet-chemical technique, and their energy storage performance was characterized by electrochemical galvanostatic method. TiO_2 powder was coupled with WO_3 powder, which was used as electron pool and the reductive energy could be stored in. As a result, the prepared TiO_2-WO_3 had good energy storage ability while pure TiO_2 showed no capacity and pure WO_3 showed quite low performance. The energy storage ability was affected by the crystal structure of WO_3 and calcination temperature. The photocatalyst had better capacity when WO3 had low degree of crystailinity, since its loose structure made it easier for electrons and cations to pass through. The photocatalytic energy storage performance was also affected by the molar ratio of TiO_2 to WO_3. Energy storage capacity was significantly dependent on the composition, reaching the maximum value at TiO_2/WO_3 1:1 (mol/mol).