Abstract
The advance of microelectronic systems requires their energy power microsupercapacitors (MSCs) possessing environmental adaptability beyond the high energy density. The electrolyte in MSCs plays a crucial role in satisfying the above requirements. In this work, we experimentally demonstrate the hydrogel electrolyte with multifunctions, including ultralow phase-transition temperature of -103.8 °C, 2.80 V electrochemical window, superior anti-dehydration and rapid self-healing ability, via modulating its ionic hydration and hydrogen bonds. It is used to build graphene-based MSCs, which show promising energy density of 41.56 µWh cm−2, super-wide working temperature range from -60 to 100 °C, exciting self-regeneration ability after deep dehydration and self-healing ability under severe physical damage. The MSCs meet the requirement of advanced microelectronic systems. The strategy developed here paves a way towards high-performance MSCs in harsh environment.
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