A new redox-active ionic liquid (2-(4-(phenyldiazenyl)phenoxy)ethyl)-1-methyl-imidazolium tetrafluoroborate ([ABEMIM][BF]) is demonstrated. It is incorporated into another ionic liquid ([EMIM][BF]) to form a mixed IL electrolyte, which can markedly improve the capacitance performance of carbon-based supercapacitors extra pseudocapacitance contribution. It opens up a new path to develop high-energy supercapacitors through introducing a redox-active ionic liquid to electrolytes.
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