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WO3-graphene electrochromic materials are widely used in electrochromic devices including smart windows and electronic displays, due to their ability to adjust optical transmittance in the visible and near-infrared ranges under low electrode potential. However, the uniformity of the film remains a challenge for the widely used physical mixing-coating method. In this study, we present a two-dimensional material-assisted synthesis of a porous hydrated WO3 film (WH-rGO) based on reduced graphene oxide (rGO) nanosheets and WO3 (rGO-WO3) seed layer via a hydrothermal method. The incorporation of rGO not only promotes the uniform growth of hydrated WO3 film, enhancing ion transport but also introduces oxygen vacancies, creating an efficient conduction pathway for charge transport. The resulting WH-rGO film exhibits impressive performance, achieving 71% optical modulation at 700 nm, with bleaching and coloring times of 4.2 and 1.0 s. The coloration efficiency is calculated at 156.11 cm2·C−1, and the optical modulation is maintained at 93% of the initial optical modulation after 1000 cycles applied in the +1.0 and −1.1 V potential ranges. This work offers new insights into the role of oxygen vacancies in enhancing the electrochromic properties of hydrated WO3 films through the addition of rGO. It also provides a promising approach for the synthesis of electrochromic materials, facilitating their application in smart window technologies.
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