Janus Nanofiber‐Architected Moisture‐Enabled Power Generator for Intelligent Sensing and Neuromorphic Application

ABSTRACT Moist‐electric generators (MEGs) harness energy from ubiquitous ambient humidity, which has emerged as a promising way to collect energy irrespective of location and time. This study presents a high‐performance MEG employing a bilayer Janus nanofiber membrane: a hydrophilic layer (lithium chloride/citric acid/polyvinyl alcohol) for enhanced moisture capture, and an evaporative layer (carbon black/polyvinylidene fluoride/polyvinyl butyral) to facilitate water release. Optimized electrode pairs yield a single‐unit output of 1.08 V, 492 μA cm −2 , and 56.7 μW cm −2 . Crucially, a novel electrode architecture employing TiO 2 nanorod arrays on the hydrophilic side enables neuromorphic applications. Under light illumination without external bias, the device exhibits excitatory synaptic responses, successfully emulating fundamental synaptic functions, including paired‐pulse facilitation (PPF), long‐term memory (LTM), and spike‐frequency‐dependent plasticity (SFDP). This work provides new design principles for self‐powered small electronics and neuromorphic sensing devices through synergistic material and electrode engineering in MEGs.