Journal
NANO ENERGY
Volume 90, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106573
Keywords
Energy harvesting; Droplet energy; Piezoelectric; Liquid-solid interface; Bulk effect; Wireless sensor system
Categories
Funding
- Research Grants Council of the Hong Kong Special Administrative Region [CityU 11212021, CityU 21210619]
- Shenzhen Fundamental Research Program [JCYJ20200109143206663]
- National Natural Science Foundation of China [11902282]
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The research has developed a leaf-mimic rain energy harvester that can collect electrostatic and kinetic energy simultaneously, generating high output power density. This device can be used to build self-charged wireless sensor systems with continuous operational capability, with low cost and easy fabrication.
Previous droplet-based electricity generator has made breakthroughs in efficient water energy harvesting through taking advantage of the contact electrification, however, the kinetic energy of water remains to be tapped into. In this work, we develop a leaf-mimic rain energy harvester (REH) that allows for the collection of electrostatic and kinetic energy simultaneously based on the synergy of the liquid-solid contact electrification and the piezoelectric effect. Impinged by a water droplet, the REH generates a boosted transferred charge value (101 nC) and high output power density (82.66 W m(-2)). We also show that such performances enable the construction of self-charged wireless sensor systems with continuous operational capability. The REH is also low-cost and facile for fabrication, paving a new way towards high-efficiency power generation from raindrops as well as other water sources.
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