ABSTRACT
Layered transition metal oxides find various applications in electrochromic devices, supercapacitors, photocatalytic activity, electrochemical properties, and so on to name a few. The smart chromogenic and layered hydrated WO3 is a promising candidate as a good electrode substitute for lithium ion, in solid-state battery fabrication for future energy markets. This can overcome the hurdles of shortage of Li-ion in the earth’s crust and the higher initial cost of battery fabrication. Being a smart chromogenic material, it can respond to external stimuli such as temperature, pressure, and voltage with very fast switching time (<1 s), excellent reversibility, and better coloration efficiency. The existence of layered nature enhances redox reaction, provides long cyclic stability, and better electrochemical performances. This chapter reviews different forms of hydrated WO3s, its structural peculiarities, the emergence of layered nature, observed chromogenic properties in the compound, and their performance and proficiency in energy harvesting techniques.
