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Fast Electrochromic Display: Tetrathiafulvalene- Graphene Nanoflake as Facilitating Materials

Abstract

A new electrochromic gel (EC-Gel) based active material has been prepared using ethyl viologen (EV) -graphene nanoflake (GNFs)- tetrathiafulvalene (TTF) for faster and efficient electrochromism. A prototype flexible electrochromic device has been fabricated using the above-mentioned EC-Gel as active layer which shows overall improved coloring efficiency of as good as 208 (C/cm2)-1. At the same time, abovementioned electrochromism shows color switching at a bias of 1.6V with coloration/bleaching times of as low as 0.4 & 0.9 seconds respectively, which is better in comparison of other traditional EC-Gel or non EC-Gel based electrochromic devices. Redox activity of EV-TTF pair result in such a fast bias induced color switching. Besides acting as an electrolyte, GNFs also facilitates achieving faster bleaching time by allowing reversing the redox process quickly. The abovementioned facilitation is done by temporarily storing the electrons released by EV during coloring cycle to be supplied to the TTF in the bleaching cycle through ballistic channels in the graphene. An in-situ UV-Vis spectroscopy establishes a transmission change of ~45% in its stable state reversibly for more than 2500 cycles when tested under ambient conditions.

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Publication details

The article was received on 29 Jun 2017, accepted on 07 Aug 2017 and first published on 07 Aug 2017


Article type: Paper
DOI: 10.1039/C7TC02913F
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Fast Electrochromic Display: Tetrathiafulvalene- Graphene Nanoflake as Facilitating Materials

    S. Mishra, P. Yogi, S. K. K. Saxena, S. Roy, P. R. Sagdeo and R. Kumar, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC02913F

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