“…Moreover, in this case, the combination of ultra-high values of and low (less than 1) value of tgδ (inset in Fig. 6b) in infra-low frequency area may be indicative of the quantum nature of power storage in InSe ‹his + H 2 O + KOH› (perpendicular to the layers), thus, the possibility of the formation of quantum accumulators of electrical energy [11,12]. For InSe ‹his + H 2 O›, in turn, similar combination of and tgδ values is observed in the range of 1 Hz to 120 Hz, what is promising for the development of quantum capacitors for radio frequency.…”