Bhattacharjee, Saheli and Pramanik, Jishu and Ghosh, Srabanti and Kundu, Susmita (2026) Time Resolved Phase Engineering of Sub-Stoichiometric Tungsten Oxide for Advanced Electrochromic Smart Windows. Materials Today Chemistry, 54 (103696). ISSN 2468-5194

Full text not available from this repository. (Request a copy)

Abstract

Fabrication of phase junction is an effective approach to enhance electrochemical activity, offering improved charge transfer mechanism. Nevertheless, this area has been largely overlooked in the field of electrochromism. Herein, a hexagonal-monoclinic phase junction of tungsten oxide was developed through precise control of dwelling time using a hydrothermal synthesis method. Phase assemblage, Rietveld refinement identified an optimal dwelling time of 12 h for the coexistence of hexagonal and monoclinic phase combination with a phase ratio (m/h) of 0.71. This dual-phase composition exhibited significant enhancements in electrochromic property, including an optical modulation (Δ%T) of 88 ± 3%, coloration time (tc) of 0.49 ± 0.05 s, and bleaching time (tb) of 0.39 ± 0.05 s. Electrochemical impedance spectroscopy study revealed that the formation of phase junction improved the electrochemical robustness of the system up to 5000 redox cycles, with only ∼7% reduction in electrochemical reversibility. In this study, the simultaneous stabilization of hexagonal and monoclinic phases in sub-stoichiometric tungsten oxide, represented a unique electrochromic performance, which had not been reported in prior literature. The Mott Schottky analyses showed a significantly higher donor density level in the mixed phase composition supporting the better scope of redox reaction in it. These attributes underscore the strong potential of the phase junction for next-generation smart window applications, enabling efficient thermal regulation and dynamic privacy control.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	Sensor and Actuator
Depositing User:	Ms Upasana Sahu
Date Deposited:	22 Sep 2026 06:54
Last Modified:	22 Sep 2026 06:54
URI:	https://cgcri.csircentral.net/id/eprint/5825

Actions (login required)

View Item