Bioinspired High‐Rate Supercapacitor Diode for Kilohertz Computing‐In‐Memory Application

Abstract The fast development of artificial intelligence and brain‐like computing poses new challenges to data processing and storage, escalating the demand for novel computing and memory devices. Herein, inspired by the selective ion‐transport behavior of protein channels in biological synapses, a hydrous hexagonal tungsten trioxide (h‐WO 3 )‐based supercapacitor diode (CAPode) is designed and constructed. Benefiting from its hexagonal biomimetic proton channels and embedded single‐file water chains, the hydrous h‐WO 3 exhibits outstanding selectivity and fast transport kinetics toward protons. As a consequence, the as‐built CAPode delivers an ultrahigh rectification ratio of 242, an unprecedented response frequency of 1745 Hz, and an excellent cycling stability over 20 000 charging/discharging cycles. Combining these unparalleled performances together, the hydrous h‐WO 3 ‐based CAPode is demonstrated to be very competent for basic logic operations even at a frequency of over kilohertz. More attractively, it also demonstrates superior writing–erasing capability and excellent long‐term memory effect, validating great potential in the burgeoning computing‐in‐memory architecture and corresponding brain‐like computing.