Journal of Power Sources, Vol.350, 28-34, 2017
High capacity WO3 film as efficient charge collection electrode for solar rechargeable batteries
In this work, we demonstrated the dye-sensitized solar rechargeable batteries devices sharing a structure of Dye-TiO2/electrolyte/Ni/WO3. The WO3 film was prepared by a simple sol-gel process exhibit high cavities and large surface area allowing efficient chemical/electrical reactions. The WO3 films with 2 +/- 0.5 mu m in thickness as charge collection electrodes exhibited a high energy density over other materials reported thus far. Under irradiation energy of 7.5 mWcm(-2) in the photo-charging, the discharging time sustained 1758 s at the current density of 0.05 mA cm(-2) in dark, the first specific discharge capacities of WO3 nano-film reach 40.6 mAh g(-1) (0.0244 mAh cm(-2)). This work substantially pushes forward the easy processing solar rechargeable batteries for future potential applications. (C) 2017 Elsevier B.V. All rights reserved.