Study on electro-optical dual-control color-changing and energy-storage device based on Mo-WO3 and Al-TiO2 thin film electrode.

[Display omitted] • Three-dimensional Mo-WO 3 and N719/Al-TiO 2 were synthesized. • A multifunctional Mo-WO 3 @N719/Al-TiO 2 was constructed. • Under dual-control, Mo-WO 3 @N719/Al-TiO 2 shows the most excellent performance. Under optical and electrical control, a multifunctional electro-optical dual-control color-changing and energy-storage device not only realizes quick color conversion, but also achieves good storage performance. In this work, Mo doped WO 3 (Mo-WO 3) films were synthesized through one-step hydrothermal method and N719/Al doped TiO 2 (N719/Al-TiO 2) films were synthesized by hydrothermal and dip-dyeing method. Eventually, choosing Mo-WO 3 as cathode and N719/Al-TiO 2 film as anode, a multifunctional electro-optical dual-control Mo-WO 3 @N719/Al-TiO 2 color-changing and energy-storage device was constructed. Under electrical control, the device shows excellent coloration efficiency (73.99 cm2/C), fast color switching rate (coloring/ bleaching time is 3.6 s/1.4 s), obviously improved area capacitance (about 82.6 mF/cm2) and excellent cycle stability. Under optical control, the device also shows shortened response time (coloring/ bleaching is 64.3 s/143.4 s), outstanding coloration efficiency (70.49 cm2/C), better area capacitance (about 58.6 mF/cm2) and excellent photoelectric conversion efficiency (10.56 %). [ABSTRACT FROM AUTHOR]