A Pseudocapacitor Diode Based on Ion-Selective Surface Redox Effect.

Supercapacitor diode (CAPode) is a novel device that integrates ion diode functionality into a conventional electrical double layer capacitor and is expected to have great applications in emerging fields such as signal propagation, microcircuit rectification, logic operations and neuromorphology. Here we report a brand new pseudocapacitor diode having both high charge storage (50.2 C g -1 at 20 mV s -1 ) and high rectification (the rectification ratio of 0.79 at 200 mV s -1 ) properties, which is realized by the ion-selective surface redox reaction of spinel ZnCo 2 O 4 in aqueous alkaline electrolyte. Furthermore, we demonstrate an application of the integrated device in the logic gate of circuit system to realize the logic operations of "AND" and "OR". This work not only expands the types of CAPodes, but also provides a train of thoughts for constructing high-performance capacitive ionic diodes. This article is protected by copyright. All rights reserved.