Influence of thermal treatment on the electrochromic properties of sodium intercalated vanadium(V) oxide xerogel thin films

Stojkovikj, Sasho and Koleva, Violeta and Najdoski, Metodija (2013) Influence of thermal treatment on the electrochromic properties of sodium intercalated vanadium(V) oxide xerogel thin films. In: 15th International Workshop on Nanoscience & Nanotechnology, 21-23 Nov 2013, Sofia, Bulgaria.

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Abstract

Vanadium(V) oxide xerogels are promising materials for application in different electrochromic devices. The present contribution is focused on the effect of thermal annealing at 250 and 400 ºC on the electrochromic properties of as-deposited Na0.33V2O5∙H2O thin films. The structure and morphology of the annealed films is examined by XRD, IR spectroscopy and SEM. The annealing at 250 ºC produces xerogel with composition of Na0.33V2O5∙0.3H2O exhibiting an inter-layered distance not significantly changed in comparison with the as-deposited xerogel. The total dehydration at 375 ºC results in the transformation of the layered structure into a tunnel structure of monoclinic NaV6O15. The electrochemical and optical properties of the annealed films are studied in LiClO4 in propylene carbonate as an electrolyte. The cyclic voltammetry measurements show that the lithium ions are reversibly intercalated/deintercalated during the cathodic and anodic potential sweep which is accompanied with reversible colour transformations due to the redox reactions between V(V) and V(IV) sites. The partially dehydrated xerogel films exhibit better electrochromic activity (DT of 68 %) in comparison with the as-deposited film (DT of 54 %) and the annealed at 400 ºC film (DT of 25 %).

Item Type:	Conference or Workshop Item (Poster)
Subjects:	Natural sciences > Chemical sciences Engineering and Technology > Materials engineering Engineering and Technology > Nano-technology
Divisions:	Faculty of Technology
Depositing User:	Saso Stojkovik
Date Deposited:	11 Mar 2024 08:39
Last Modified:	11 Mar 2024 08:39
URI:	https://eprints.ugd.edu.mk/id/eprint/33845

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