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).
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