Abstract
Tungsten oxide-based materials have drawn huge attention for their versatile uses to construct various energy storage devices. Particularly, their electrochromic devices and optically-changing devices are intensively studied in terms of energy-saving. Furthermore, based on close connections in the forms of device structure and working mechanisms between these two main applications, bifunctional devices of tungsten oxide-based materials with energy storage and optical change came into our view, and when solar cells are integrated, multifunctional devices are accessible. In this article, we have reviewed the latest developments of tungsten oxide-based nanostructured materials in various kinds of applications, and our focus falls on their energy-related uses, especially supercapacitors, lithium ion batteries, electrochromic devices, and their bifunctional and multifunctional devices. Additionally, other applications such as photochromic devices, sensors, and photocatalysts of tungsten oxide-based materials have also been mentioned. We hope this article can shed light on the related applications of tungsten oxide-based materials and inspire new possibilities for further uses.
Highlights
Energy exhaustion and environment deterioration has caused more and more scientific and public concern
The results showed that slight doping of Nb enables the film to have wider optical modulation range, shorter switching speed, and higher capacitance because the introduction of the Nb element was accompanied by the introduction of O vacancy which increased the conductivity of the electrode
Tungsten oxides are attractive for their numerous possibilities in various fields, in energy storage like lithium ion battery (LIB), SCs, and electrochromisms
Summary
Energy exhaustion and environment deterioration has caused more and more scientific and public concern. When used as the electrode in SC, because the valence of W can be changed between +2 and +6, its theoretical specific capacity is 1112 F g−1 [26], much higher than the normally used double-layer capacitor’s carbon electrode material, and when as the anode in LIB, its theoretical specific capacity is 693 mA h g−1 , nearly double that of graphite They are endowed with other advantages including high density, low cost, environmental friendliness, and nontoxicity. We can get direct information about their working condition from color signals, bringing us great convenience and safety, or we can see it as a transparent battery and make good use of the energy stored in it, reducing electricity consumption These bifunctional devices can have more possibilities by integrating other parts, such as solar cells, so that self-powered systems are achieved [30,31].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
