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High-performance electrochromic devices based poly[Ni(salen)]-type polymer films

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journal contribution
posted on 25.10.2016, 13:04 by Marta Nunes, Mariana Araujo, Joana Fonseca, Cosme Moura, Robert Hillman, Christina Freire
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.

History

Citation

ACS Applied Materials and Interfaces, 2016, 8 (22), pp 14231–14243

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Chemistry

Version

AM (Accepted Manuscript)

Published in

ACS Applied Materials and Interfaces

Publisher

American Chemical Society

issn

1944-8244

eissn

1944-8252

Acceptance date

13/05/2016

Copyright date

2016

Available date

13/05/2017

Publisher version

http://pubs.acs.org/doi/abs/10.1021/acsami.6b01977

Language

en

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