4.6 Article

Electrochromic evaluation of airbrushed water-dispersible W18O49 nanorods obtained by microwave-assisted synthesis

Journal

NANOTECHNOLOGY
Volume 32, Issue 21, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/1361-6528/abc641

Keywords

W18O49; nanorods; microwave-assisted solvothermal synthesis; electrochromic

Funding

  1. Progetto FISR - C.N.R. 'Tecnopolo di nanotecnologia e fotonica per la medicina di precisione' - CUP [B83B17000010001, HOQ3PM3-CUP B37H17004900007, WOBV6K5-CUP B37H17005230007]

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This study successfully synthesized W18O49 nanostructured electrodes through green processing methods, achieving highly uniform transparent coatings and demonstrating excellent electrochemical and electrochromic properties. In-depth characterization of the morphology and structural characteristics of the material through various techniques validated the reversibility of the electrode performance and significant optical contrast.
Motivated by the technological relevance of tungsten oxide nanostructures as valuable materials for energy saving technology, electrochemical and electrochromic characteristics of greener processed nanostructured W18O49-based electrodes are discussed in this work. For the purpose, microwave-assisted water-dispersible W18O49 nanorods have been synthesized and processed into nanostructured electrodes. An airbrushing technique has been adopted as a cost-effective large-area scalable methodology to deposit the W18O49 nanorods onto conductive glass. This approach preserves the morphological and crystallographic habit of native nanorods and allows highly homogeneous transparent coating where good electronic coupling between nanowires is ensured by a mild thermal treatment (250 degrees C, 30 min). Morphological and structural characteristics of active material were investigated from the synthesis to the nanocrystal deposition process by transmission and scanning electron microscopy, x-ray diffraction, atomic force microscopy and Raman spectroscopy. The as-obtained nanostructured film exhibited good reversible electrochemical features through several intercalation-deintercalation cycles. The electrochromic properties were evaluated on the basis of spectro-electrochemical measurements and showed significant optical contrast in the near-infrared region and high coloration efficiency at 550 nm.

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