Fig. 3: Ionic rectifiers based on hydrogel diodes.
a The schematic of circuit showing the half-wave rectifier containing one hydrogel ionic diode and b the schematic of circuit showing the full-wave rectifier containing four hydrogel ionic diodes with Al3+. c–e The input triangle wave, sin wave, and square wave with an amplitude of 5 V and frequency of 0.01 Hz. f–h The output currents from the hydrogel ionic diode-based half-wave rectifier under the three different inputs. i–k The output currents from the hydrogel ionic diode-based full-wave rectifier under the three different inputs
