Journal
ADVANCED SCIENCE
Volume 7, Issue 13, Pages -Publisher
WILEY
DOI: 10.1002/advs.202000517
Keywords
finite element simulations; nanogenerators; phase diagrams; piezoelectric nanogenerators; porous nanofibers
Categories
Funding
- Australian Endeavour Fellowship Program
- Deakin University
- Alexander von Humboldt Foundation
- Australian Research Council World Class Future Fibre Industry Transformation Research Hub [IH140100018]
- Australian Research Council Training Centre for Light Weight Automotive Structures (ATLAS)
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Hierarchically porous piezoelectric polymer nanofibers are prepared through precise control over the thermodynamics and kinetics of liquid-liquid phase separation of nonsolvent (water) in poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) solution. Hierarchy is achieved by fabricating fibers with pores only on the surface of the fiber, or pores only inside the fiber with a closed surface, or pores that are homogeneously distributed in both the volume and surface of the nanofiber. For the fabrication of hierarchically porous nanofibers, guidelines are formulated. A detailed experimental and simulation study of the influence of different porosities on the electrical output of piezoelectric nanogenerators is presented. It is shown that bulk porosity significantly increases the power output of the comprising nanogenerator, whereas surface porosity deteriorates electrical performance. Finite element method simulations attribute the better performance to increased volumetric strain in bulk porous nanofibers.
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