Fig. 1: Schematic explanation of PCID based energy interactive system.
From: Hybrid electromagnetic and moisture energy harvesting enabled by ionic diode films

a Schematic of the chemical structure of P(AAm-co-AAc), P(AAm-co-AAc)/KCl, and P(AAm-co-AAc)/PPy. b Molecular structures and charge/discharge process in PCIDs. c1-c4 SEM and EDX elemental mapping images of MC100-2, d FTIR spectra of MC50-2, e Dynamic development of VO value of MC100-2 under moist and EMW radiation. f A schematic comparison between the conventional energy interactive system and our wireless energy interactive system, g Schematic illustration of the physical mechanism underlying the moist response of PCIDs. h Schematic illustration of the coupled physical mechanism underlying the electromagnetic-moist response of PCIDs.