Panorama of hydrothermal synthesis towards profound electrochromism of tungsten oxide nanostructures: a review

Tungsten trioxide-(WO<inf>3</inf>) is one of the utmost appropriate inorganic electrochromic materials. WO<inf>3</inf> nanostructures are becoming increasingly prevalent in a diverse array of electrochromic (EC) device applications, as it offers substantially larger active response area, which leads to an increase in colour contrast, according to research. The novel technique of powder synthesis and material preparation has gained interest as materials science advances. Recently, the hydrothermal approach has emerged as a viable liquid phase preparation methodology as it provides several benefits. In this view it becomes essential to deepen the understanding of hydrothermal synthesis towards carving WO<inf>3</inf> nanostructures to foster electrochromic state-of-the-art. In this review analysis of hydrothermal synthesis towards sculpturing various WO<inf>3</inf> nanostructures such as nanowire, nanotubes, nanoflower, Nano tree etc. for modest electrochromism has been portrayed. Moreover, practicality in role of various hydrothermally synthesized WO<inf>3</inf> nanostructures for different applications has also been discussed.