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Title: Nd-Nb Co-doped SnO₂/α-WO₃ electrochromic materials: enhanced stability and switching properties
Authors: Goei, Ronn
Ong, Amanda Jiamin
Tan, Jun Hao
Loke, Jie Yi
Lua, Shun-Kuang
Mandler, Daniel
Magdassi, Shlomo
Tok, Alfred Iing Yoong
Keywords: Engineering::Materials
Issue Date: 2021
Source: Goei, R., Ong, A. J., Tan, J. H., Loke, J. Y., Lua, S., Mandler, D., Magdassi, S. & Tok, A. I. Y. (2021). Nd-Nb Co-doped SnO₂/α-WO₃ electrochromic materials: enhanced stability and switching properties. ACS Omega, 6(40), 26251-26261.
Journal: ACS Omega
Abstract: The fabrication of Nd-Nb co-doped SnO2/α-WO3 electrochromic (EC) materials for smart window applications is presented in the present paper. Nb is a good dopant candidate for ECs owing to its ability to introduce active sites on the surface of α-WO3 without causing much lattice strain due to the similar ionic radius of Nb5+ and W6+. These active sites introduce more channels for charge insertion or removal during redox reactions, improving the overall EC performance. However, Nb suffers from prolonged utilization due to the Li+ ions trapped within the ECs. By coupling Nd with Nb, the co-dopants would transfer their excess electrons to SnO2, improving the electronic conductivity and easing the insertion and extraction of Li+ cations from the ECs. The enhanced Nd-Nb co-doped SnO2/α-WO3 exhibited excellent visible light transmission (90% transmittance), high near-infrared (NIR) contrast (60% NIR modulation), rapid switching time (∼1 s), and excellent stability (>65% of NIR modulation was retained after repeated electrochemical cycles). The mechanism of enhanced EC performance was also investigated. The novel combination of Nd-Nb co-doped SnO2/α-WO3 presented in this work demonstrates an excellent candidate material for smart window applications to be used in green buildings.
ISSN: 2470-1343
DOI: 10.1021/acsomega.1c03260
Rights: © 2021 The Authors. Published by American Chemical Society. This is an open-access article distributed under the terms of the Creative Commons Attribution License.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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