| Title |
Synergistic Integration of Piezoelectric and Dual-Mode Triboelectric Effects in a Monolithic, Volumetric PVDF Nanofiber Laminate for a Hybrid Nanogenerator |
| Authors |
(Junseo Gu) ; (Jeonghoon Oh) ; (Kwanlae Kim) |
| DOI |
https://doi.org/10.3365/KJMM.2026.64.6.531 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Polyvinylidene fluoride; Piezoelectric nanogenerator; Triboelectric nanogenerator; Nanofiber; Hybrid nanogenerator; Electrospinning |
| Abstract |
Polyvinylidene fluoride (PVDF)-based piezoelectric nanogenerators are promising for mechanical
energy harvesting but are often limited by their low output performance and complex fabrication processes.
In this study, a novel hybrid nanogenerator (HNG) was fabricated from a monolithic volumetric PVDF
nanofiber (NF) laminate that synergistically integrated piezoelectric and dual-mode triboelectric effects.
Volumetric structures of large- and small-diameter NFs were created by alternately electrospinning PVDF
solutions of varying concentrations. This unique architecture simultaneously harnesses three mechanisms: (i)
the intrinsic piezoelectricity of PVDF, (ii) structural contact electrification driven by strain-induced bond
scission at the fiber interfaces owing to topographical asymmetry, and (iii) phase-induced contact
electrification originating from a disparity in the crystalline phase of the PVDF. The resulting HNG
demonstrated dramatically enhanced output performance under mechanical preload conditions, far exceeding
that of single-component PVDF NF mats. The performance scaled proportionally with the number of layers,
as confirmed by fast Fourier transform analysis, which revealed a progressively dominant triboelectric
contribution. Furthermore, the laminate structure significantly outperformed its single-component
counterparts in the contact-separation mode, validating the versatility of this design for energy-harvesting
applications. By harnessing the synergistic effects, a substantial enhancement in electrical output is achieved
in both mechanical preload and contact?separation modes, eliminating the need for dissimilar materials and
fillers. |