Energy‐Autonomous Janus Nanofibrous Textile for Sustainable Bi‐Directional Thermal Management and Self‐Powered Wearable Electronics

ABSTRACT Achieving energy autonomy and zero‐energy bidirectional personal thermal management (PTM) in wearable electronics remains a formidable challenge. Here, we fabricate an energy‐autonomous Janus PS@PT textile via a multifunctional synergistic filler strategy, integrating alkyl‐chain‐modified silica and photothermal nanoparticles into poly(vinylidene fluoride‐ co ‐hexafluoropropylene) (PVDF‐HFP), denoted as PS and PT, respectively. This strategy yields synergistic effects: the fillers act as PTM enhancers for adaptive regulation, as dielectric modifiers increasing the β ‐phase content, and as charge trap centers strengthening interfacial polarization, raising the dielectric constant to 1.27 times that of pristine PVDF‐HFP. Under 1000 W/m 2 irradiation, the PS layer achieves radiative cooling of ∼2.7°C (net cooling power 97.1 W/m 2 ) with 95.3% solar reflectance and 92.2% MIR emissivity, while the PT layer delivers solar heating of ∼12.9°C (net heating power 260.43 W/m 2 ) with 49.9% solar absorptance. Significantly, the functional fillers substantially optimize the dielectric properties and charge‐trapping capability, effectively suppressing high‐temperature performance degradation. At 85°C, the output voltages of PT and PS show enhancements of 159.7% and 144.9% relative to room‐temperature values. This work establishes a new paradigm for synergistically enhancing PTM capability and stable triboelectric output in a single device, offering a promising pathway toward multifunctional integration in smart textiles.