Journal
NANO ENERGY
Volume 50, Issue -, Pages 62-69Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2018.05.012
Keywords
Piezoelectric nanogenerator; Composite; Sodium potassium niobate; Heterostructure; Enhanced polarization
Categories
Funding
- China Postdoctoral Science Foundation [2017M612177]
- National Natural Science Foundation of China [51702119, 51702122]
- Shandong Provincial Natural Science Foundation [ZR2016EMQ07]
- Postdoctoral Science Foundation from University of Jinan [XBH1701]
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In this study, Ag/(K, Na)NbO3 heterostructure constructed by in-situ photoreduction reaction is firstly introduced to fabricate the flexible piezoelectric nanogenerator (p-NG). The chemical heterojunction can improve the partial voltage applied to the KNN particles during poling process, and significantly enhance the orientation of dipole moment under the electric field. The p-NG device with Ag/(K, Na)NbO3 heterostructure generates two orders of magnitude higher output than the pure KNN-based device (240 VS. 3.5 V; 23 VS. 0.3 mu A under mechanical stress of 0.1 MPa). The maximum instantaneous output power (1.13 mW) is higher than the previously reported lead-free composite-based piezoelectric nanogenerators. Moreover, these Ag/(K, Na)NbO3-based p-NG devices retained the mechanical robustness and electrical properties after 1000 cycles in the durability test. In addition, nine commercial LEDs connected in series can be successfully illuminated by our p-NG device without any storage equipment.
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