A ferrocene-viologen linked "bipolar" type redox-active ionic liquid ([FcCVC][TFSI]) was synthesized as an electrochromic (EC) material that functions without any other additives: solvents, supporting electrolytes and sacrificial agents. The efficiency of a prototype symmetrical EC cell was 70 cm C at 1.0 V. The EC process was stable even after over 10 000 potential cycles.
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