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Title: High-performance electrochromic devices based poly[Ni(salen)]-type polymer films
Authors: Nunes, Marta
Araujo, Mariana
Fonseca, Joana
Moura, Cosme
Hillman, Robert
Freire, Christina
First Published: 13-May-2016
Publisher: American Chemical Society
Citation: ACS Applied Materials and Interfaces, 2016, 8 (22), pp 14231–14243
Abstract: We report the application of two poly[Ni(salen)]-type electroactive polymer films as new electrochromic materials. The two films, poly[Ni(3-Mesalen)] (poly[1]) and poly[Ni(3-MesaltMe)] (poly[2]), were successfully electrodeposited onto ITO/PET flexible substrates, and their voltammetric characterization revealed that poly[1] showed similar redox profiles in LiClO4/CH3CN and LiClO4/propylene carbonate (PC), while poly[2] showed solvent-dependent electrochemical responses. Both films showed multielectrochromic behavior, exhibiting yellow, green, and russet colors according to their oxidation state, and promising electrochromic properties with high electrochemical stability in LiClO4/PC supporting electrolyte. In particular, poly[1] exhibited a very good electrochemical stability, changing color between yellow and green (λ = 750 nm) during 9000 redox cycles, with a charge loss of 34.3%, an optical contrast of ΔT = 26.2%, and an optical density of ΔOD = 0.49, with a coloration efficiency of η = 75.55 cm2 C–1. On the other hand, poly[2] showed good optical contrast for the color change from green to russet (ΔT = 58.5%), although with moderate electrochemical stability. Finally, poly[1] was used to fabricate a solid-state electrochromic device using lateral configuration with two figures of merit: a simple shape (typology 1) and a butterfly shape (typology 2); typology 1 showed the best performance with optical contrast ΔT = 88.7% (at λ = 750 nm), coloration efficiency η = 130.4 cm2 C–1, and charge loss of 37.0% upon 3000 redox cycles.
DOI Link: 10.1021/acsami.6b01977
ISSN: 1944-8244
eISSN: 1944-8252
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © American Chemical Society, 2016. This version of the article is distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License ( ), which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Appears in Collections:Published Articles, Dept. of Chemistry

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