High performance electrochromic devices based on anodized nanoporous Nb2O5

Yao, David D., Rani, Rozina A., O'Mullane, Anthony P., Kalantar-zadeh, Kourosh, & Ou, Jian Zhen (2014) High performance electrochromic devices based on anodized nanoporous Nb2O5. The Journal of Physical Chemistry C, 118(1), pp. 476-481.

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Despite the predictions, the true potential of Nb2O5 for electrochromic applications has yet to be fully realized. In this work, three-dimensional (3D) compact and well-ordered nanoporous Nb2O5 films are synthesized by the electrochemical anodization of niobium thin films. These films are formed using RF sputtering and then anodized in an electrolyte containing ethylene glycol, ammonium fluoride, and small water content (4%) at 50 °C which resulted in low embedded impurities within the structure. Characterization of the anodized films shows that a highly crystalline orthorhombic phase of Nb2O5 is obtained after annealing at 450 °C. The 3D structure provides a template consisting of a large concentration of active sites for ion intercalation, while also ensuring low scattering directional paths for electrons. These features enhance the coloration efficiency to 47.0 cm2 C?1 (at 550 nm) for a 500 nm thick film upon Li+ ion intercalation. Additionally, the Nb2O5 electrochromic device shows a high bleached state transparency and large optical modulation.

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ID Code: 68164
Item Type: Journal Article
Refereed: Yes
DOI: 10.1021/jp410097y
ISSN: 1932-7447
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright American Chemical Society
Deposited On: 09 Mar 2014 23:51
Last Modified: 23 Jun 2014 00:03

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