High‐Power‐Density Triboelectric Nanogenerator Driven by Ferroelectric Fluid

ABSTRACT Despite the prospect of self‐powered clean energy systems, triboelectric nanogenerators (TENGs) are practically limited by low efficiency. Conventional material‐engineering strategies to boost performance, such as integrating dielectric and polar nanomaterials, continue to yield inadequate results. Here, we demonstrate a dramatic improvement in triboelectrification by incorporating a fluid‐like ferroelectric nematic liquid crystal (N F ‐LC) as a functional filler into a common poly(vinylidene fluoride) (PVDF) matrix. The large spontaneous polarization and high dielectric constant of N F ‐LCs serve as effective charge boosters, promoting the growth of electroactive phases, interfacial dipolar coupling, and long‐lived charge trapping. The optimized composite film produced a maximum ∼1.1 kV open‐circuit voltage, 50 µA short‐circuit current, and 110 W m − 2 power density, representing an order‐of‐magnitude improvement over pure PVDF. The device demonstrates excellent charge storage capability, powers more than 500 LEDs without power management, and efficiently harvests low‐frequency acoustic energy. By linking molecular ferroelectric order with macroscopic charge generation, this work establishes an unprecedented route for high‐performance soft‐matter‐based energy technologies.