Nanostructure-dependent colouration efficiency of electrochromic coatings using 0D, 1D, and 2D WO₃ for smart windows
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Date
2024
Authors
Dadkhah, M.
Nine, M.J.
Purasinhala, K.
Sandhu, G.S.
Losic, D.
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Nano Materials Science, 2024; 8(2):1-9
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Mahnaz Dadkhah, Md Julker Nine, Kosala Purasinhala, Gurleen Singh Sandhu, Dusan Losic
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Abstract
Towards the development of highly efficient electrochromic coatings, the crystallinity, morphology (e.g. size and shape) of electrochromic nanomaterials, and their charge insertion capacities play a significant role. Herein, we report the structure-dependent colouration effciency in electrochromic coatings based on the use of 0D, 1D and 2D tungsten trioxide (WO₃) nanostructures. A series of WO₃ with different nanostructures were prepared and used as working electrodes to fabricate electrochromic devices for smart windows applications. Facile spray coating was applied on fluorine-doped tin oxide (FTO) substrate to make ∼70 % transparent working electrodes to investigate their charge insertion capacities, electrochromic active surface area, and colouration efficiency. Results showed that the 2D WO₃ nanoflakes displayed the highest diffusion coefficient for the intercalation of 1.52 × 10 ¯¹⁰ cm²/s with an increased electrochemical active surface area of 25.10 mF/cm², a large modulation of optical reflectance (42.63 %) with 3.79 s shorter response time for bleaching and a greater colouration efficiency (CE) value (89.29 cm²/C) at 700 nm compared to the CE value for 1D WO₃ (of 22 cm²/C) and 0D WO₃ (8 cm²/C). The outcome of this study provides a new insight and valuable contribution to design an efficient electrochromic coating by controlling and optimising the nanostructures of selective electrochromic materials.
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© 2024 Chongqing University. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).