Abstract
Electrochromism is a phenomenon in which reversible color change occurs by redox reaction and devices with such characteristics are called electrochromic (EC) devices. The EC devices are often composed of EC materials, compensators for the reaction charge, electrolytes, solvents, and electrodes. Such EC devices, however, contain potential issues such as solvent volatilization and damage caused by physical cracks.By the way, ionic liquids (IL) are non-volatile, flame retardant, chemically stable, and possess high ionic conductivity. In addition, ILs play double roles as electrolytes and solvents. Therefore, fabricating all components of the EC device using IL leads to not only clearing up the issues at once but also the development of the eco-friendly one.In this work, we have fabricated two types of EC devices. In this work, we have fabricated two types of EC devices. One is an all-in-one type that consists of only ferrocene (Fc)-viologen (V)-linked IL.1 The other is a composite type that is composed of an Fc IL and V IL without any additives: solvent, supporting, and electrolyte.2 As a result, both EC devices showed good EC performance. The efficiency of the former and later devices were 70 and 91.4 cm2 C-1 at 1.0 V, respectively; the EC process was stable even after over 10 000 potential cycles for the former device and 13 000 ones for the latter device.In this presentation, we also describe the synthesis of ILs and their electrochemistry in detail.
Published Version
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