Pseudocapacitive behaviour in sol-gel derived electrochromic titania nanostructures
authors Giannuzzi, R; Prontera, T; Tobaldi, DM; Pugliese, M; De Marco, L; Carallo, S; Gigli, G; Pullar, RC; Maiorano, V
nationality International
journal NANOTECHNOLOGY
author keywords TiO2; electrochromics; pseudocapacitance; sol-gel
keywords TIO2 THIN-FILMS; LI+ ION INSERTION; PHOTOCATALYTIC ACTIVITY; ANATASE; PERFORMANCE; ANODE; FABRICATION; ELECTRODES; NANOTUBES; NANODOTS
abstract Nanostructured thin films are widely investigated for application in multifunctional devices thanks to their peculiar optoelectronic properties. In this work anatase TiO2 nanoparticles (average diameter 10 nm) synthesised by a green aqueous sol-gel route are exploited to fabricate optically active electrodes for pseudocapacitive-electrochromic devices. In our approach, highly transparent and homogeneous thin films having a good electronic coupling between nanoparticles are prepared. These electrodes present a spongy-like nanostructure in which the dimension of native nanoparticles is preserved, resulting in a huge surface area. Cyclic voltammetry studies reveal that there are significant contributions to the total stored charge from both intercalation capacitance and pseudocapacitance, with a remarkable 50% of the total charge deriving from this second effect. Fast and reversible colouration occurs, with an optical modulation of similar to 60% in the range of 315-1660 nm, and a colouration efficiency of 25.1 cm(2) C-1 at 550 nm. This combination of pseudocapacitance and electrochromism makes the sol-gel derived titania thin films promising candidates for multifunctional 'smart windows'.
publisher IOP PUBLISHING LTD
issn 0957-4484
isbn 1361-6528
year published 2021
volume 32
issue 4
digital object identifier (doi) 10.1088/1361-6528/abbceb
web of science category 12
subject category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied
unique article identifier WOS:000584898900001
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journal analysis (jcr 2019):
journal impact factor 3.551
5 year journal impact factor 3.392
category normalized journal impact factor percentile 63.589
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