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• W2775275220 abstract "Recent studies have demonstrated the benefits of water-dielectric interfaces in electrostatic energy harvesting. Most efforts have been focused on extracting the kinetic energy from the motions of water drops on hydrophobic surfaces, and thus, the resulting schemes inherently prefer cases where the water drops move at a high speed, or vibrate at a high frequency. Here we report a method for directly harvesting ambient mechanical energy as electric potential energy through water droplets by making alternate contacts with CYTOP and PTFE thin films. Because CYTOP and PTFE acquire significantly different surface charge densities during contact with water, such a difference can be utilized to effectively generate electricity. We demonstrate this concept using prototype devices fabricated on silicon substrates with a simple procedure. In the experiments conducted, a water drop of 400 μL alone could generate a peak open-circuit voltage of 42 V under a 0.25 Hz vibration. Under a 2.5 Hz vibration, the peak open-circuit voltage reached 115 V under an external bias of 8 V. The demonstrated efficiency is orders of magnitude higher than those of existing devices of similar dimensions." @default.
• W2775275220 created "2017-12-22" @default.
• W2775275220 creator A5022704321 @default.
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• W2775275220 date "2017-12-01" @default.
• W2775275220 modified "2023-10-18" @default.
• W2775275220 title "Harvesting energy from low-frequency excitations through alternate contacts between water and two dielectric materials" @default.
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• W2775275220 doi "https://doi.org/10.1038/s41598-017-17522-8" @default.
• W2775275220 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5719356" @default.
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