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An electrochromic ionic liquid: design, characterisation and performance in a solid state platform

Kavanagh, Andrew and Fraser, Kevin J. and Byrne, Robert and Diamond, Dermot (2012) An electrochromic ionic liquid: design, characterisation and performance in a solid state platform. ACS Applied Materials and Interfaces, 5 (1). pp. 55-62. ISSN 1944-8244

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This work describes the synthesis and characteristics of a novel electrochromic ionic liquid (IL) based on a phosphonium core tethered to a viologen moiety. When integrated into a solid-state electrochromic platform, the viologen modified IL behaved as both the electrolyte and the electrochromic material. Platform fabrication was achieved through in situ photo-polymerisation and encapsulation of this novel IL within a hybrid sol-gel. Important parameters of the platform performance, including its coloration efficiency, switching kinetics and optical properties were characterised using UV/Vis spectroscopy and cyclic voltammetry in tandem. The electrochromic platform exhibits a coloration efficiency of 10.72 cm2C-1, and a varied optical output as a function of the incident current. Despite the rather viscous nature of the material, the platform exhibited approximately two orders of magnitude faster switching kinetics (221 seconds to reach 95 % absorbance) when compared to previously reported electrochromic ILs (18,000 seconds).

Item Type:Article (Published)
Uncontrolled Keywords:Ionic liquids; electrochromic materials; electrochromic devices; solid-state electrolytes; viologens
Subjects:Physical Sciences > Optoelectronics
Physical Sciences > Electrochemistry
Physical Sciences > Organic chemistry
Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Publisher:American Chemical Society
Official URL:
Copyright Information:This document is the Accepted Manuscript version of a Published Work that appeared in final form in Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:European Commission through a Marie Curie Actions re-integration grant (IRG) (PIRG07-GA-2010-268365) , Irish Research Council for Science, Engineering and Technology, Science Foundation Ireland under grant 07/CE/I1147 , Enterprise Ireland grant 07/RFP/MASF812, which is part of the EU-MATERA initiative
ID Code:17667
Deposited On:06 Mar 2013 14:09 by Andrew Kavanagh. Last Modified 22 Feb 2017 15:06

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