Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/40618
Title: N-doped few-layered graphene-polyNi complex nanocomposite with excellent electrochromic properties
Authors: Nunes, Marta
Araujo, Mariana
Bacsa, Revathi
Ferreira, Roberta V.
Castillejos, Eva
Serp, Phillipe
Hillman, A. Robert
Freire, Cristina
First Published: 3-May-2017
Publisher: Elsevier for American Carbon Society
Citation: Carbon, 2017, 120, pp. 32-43
Abstract: A new nanocomposite was obtained through the incorporation of N-doped few-layered graphene (N-FLG) into films of the electroactive polymer poly[Ni(3-Mesalen)] (poly[1]). The nanocomposite, N-FLG@poly[1], prepared by in situ electropolymerization, showed similar electrochemical responses to pristine poly[1], but with more well-defined redox peaks and higher current intensities, in compliance with larger electroactive surface coverage. N-FLG incorporation did not affect the electronic structure of poly[1], but decreased in 12% the molar extinction coefficient of the charge transfer band between metal and oxidized ligand, which is a promising advantage since this band is related to polymer degradation. The N-FLG@poly[1] showed multi-electrochromic behaviour (yellow in reduced state and green/russet in oxidized states) and revealed excellent improvement in electrochromic performance compared to original poly[1], specifically an increase of 71% in electrochemical stability (loss of 2.7% in charge after 10 000 switching cycles). Furthermore, nanocomposite formation decreased the switching time for oxidation (reduction) τ = 9 s (11 s) and improved the optical contrast (ΔT = 35.9%; increase of 38%) and colouration efficiency (η = 108.9 cm2 C−1; increase of 12%), for a representative film of coverage Γ = 296 nmol cm−2. The excellent electrochromic performance improvements are attributed to the alternative conducting pathways and to morphological modifications induced by N-FLG.
DOI Link: 10.1016/j.carbon.2017.05.001
ISSN: 0008-6223
eISSN: 1873-3891
Links: http://www.sciencedirect.com/science/article/pii/S0008622317304463?via%3Dihub
http://hdl.handle.net/2381/40618
Embargo on file until: 3-May-2018
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2017, Elsevier for American Carbon Society. After an embargo period this version of the paper will be an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), 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.
Description: The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.
Appears in Collections:Published Articles, Dept. of Chemistry

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