Nd-Nb Co-doped SnO2/α-WO3Electrochromic Materials: Enhanced Stability and Switching Properties

Ronn Goei, Amanda Jiamin Ong, Jun Hao Tan, Jie Yi Loke, Shun Kuang Lua, Daniel Mandler, Shlomo Magdassi, Alfred Iing Yoong Tok

Research output: Contribution to journalArticlepeer-review


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.

Original languageAmerican English
Pages (from-to)26251-26261
Number of pages11
JournalACS Omega
Issue number40
StatePublished - 12 Oct 2021

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering


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