Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 15, Pages 7662-7669Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.08.010
Keywords
KNN; Lead-free; Nanofibers; Piezoelectric nanogenerator; Energy harvesting
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Funding
- European Union's Horizon 2020 research and innovation programme (ITN ENHANCE) under the Marie Sklodowska-Curie grant [722496]
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This study demonstrates a flexible nanogenerator based on electrospun Li and Ta-modified lead-free KNN nanofibers, yielding a high voltage output of 5.6 V. The incorporation of Li and Ta into the KNN lattice significantly influences the electromechanical coupling and the morphology of the nanofibers.
Piezoelectric energy harvesters (PEH) hold enormous potential for converting mechanical energy from our surrounding environment into electrical energy that can be used for powering portable electronics. Potassium sodium niobate (KNN) is one of the promising alternatives to replace lead-based piezoelectric materials. This work presents a cutting-edge demonstration of synthesis-function-device integration of piezoelectric nanofibers, where the morphology and the composition are engineered towards achieving high device output. We report a flexible nanogenerator based on electrospun Li and Ta-modified lead-free KNN nanofibers yielding a high voltage output of 5.6 V, which is around 9-fold higher than for the Mn-doped KNN nanofibers reported previously. The influence of Li and Ta-incorporation into the KNN lattice on the electromechanical coupling and the effect of a nanofiber morphology are investigated. The net-shaped KNN and Li and Ta-modified KNN nanofibers, synthesized by electrospinning of appropriate sols, maintain their structural integrity upon calcination and firing steps. The phase analysis (XRD) confirms the formation of single-phase (KNN) material. Li and Ta are found to be incorporated on the A and B-sites of the perovskite lattice, respectively. Piezo force microscopy data show the heat-treated nanofibers to exhibit multi-domain ferroelectric properties.
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