Figure 2
From: Ionic Circuits Powered by Reverse Electrodialysis for an Ultimate Iontronic System

Time vs. voltage and ionic current plot of RED-powered ionic diode under (a) forward bias, and (b) reverse bias voltage. Note that the sign of voltage and current is inversed under reverse bias condition. (Black solid line: voltage generated from RED, Red solid line: voltage drop across the diode, Blue solid line: ionic current).