Amorphous solid

Quantum mechanics

Catalysis

Electrochromic devices

Engineering

Prussian blue

Capacitance

Mesoporous material

Fabrication

Electrochemistry

Metallurgy

Materials science

Triphenylamine

Tungsten

Electrochromism

Power (physics)

Biochemistry

Chemical engineering

Physical chemistry

Supercapacitor

Alternative medicine

Thermodynamics

Physics

Nanotechnology

Organic chemistry

Energy storage

Evaporation

Medicine

Chemistry

Electrode

Optoelectronics

Tungsten trioxide

Pathology

NPG Asia Materials

Mesoporous metal oxides consisting of fully interconnected network structures with small pores (20–50 nm) have high surface areas and decreased ion intercalation distances, making them ideal for use in high-performance electrochromic supercapacitors (ECSs). Evaporation-induced self-assembly (EISA), which combines sol–gel chemistry and molecular self-assembly, is a powerful method for the fabrication of mesoporous metal oxides through a solution phase synthesis. Herein, we introduce ultrafast sub-1 s ECSs based on an amorphous mesoporous tungsten trioxide (WO 3 ) that is prepared by EISA. Compared to that of a compact-WO 3 film-based device, the performances of an ECS with mesoporous WO 3 exhibits a large optical modulation (76% at 700 nm), ultrafast switching speeds (0.8 s for coloration and 0.4 s for bleaching), and a high areal capacitance (2.57 mF/cm 2 ), even at a high current density (1.0 mA/cm 2 ). In addition, the excellent device stability during the coloration/bleaching and charging/discharging cycles is observed under fast response conditions. Moreover, we fabricated a patterned mesoporous WO 3 for ECS displays (ECSDs) via printing-assisted EISA (PEISA). The resulting ECSDs can be used as portable energy-storage devices, and their electrochromic reflective displays change color according to their stored energy level. The ECSDs in this work have enormous potential for use in next-generation smart windows for buildings and as portable energy storage displays.

Extremely fast electrochromic supercapacitors based on mesoporous WO3 prepared by an evaporation-induced self-assembly