期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 51, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202208393
关键词
distributed energy; green energy; liquid-liquid contact electrification; triboelectric nanogenerators
类别
资金
- National Natural Science Foundation of China (NSFC)/ Research Grants Council of Hong Kong (RGC) Joint Research Scheme [N_HKU718/19]
- RGC [17306820]
- Excellent Young Scientists Fund (Hong Kong and Macau) from NSFC [21922816]
- Croucher Senior Research Fellowship from Croucher Foundation
This study comprehensively investigates the mechanisms of contact electrification in various liquid-liquid systems and demonstrates a liquid-liquid TENG for harvesting energy from rainwater. The liquid-liquid TENG has high charge density, high output stability, and long effective contact electrification time.
As one of the most widely distributed water resources, rainwater contains tremendous energy that cannot be effectively utilized by the conventional electromagnetic generators. Triboelectric nanogenerators (TENGs) represent a distributed method to convert trivial mechanical energy into electricity based on contact electrification. Benefiting from the large and replenishable contact interfaces in liquid-liquid systems, liquid-liquid TENG further promises efficient charge transfer. However, the limited understanding of liquid-liquid contact electrification has restricted its development. In this study, the mechanisms of contact electrification in various liquid-liquid systems is comprehensively investigated and thus a liquid-liquid TENG with optimized materials and structures to harvest energy from rainwater is demonstrated. The proposed liquid-liquid TENG generates a high charge density (3.63 mu C L-1) with high output stability (crest factor approximate to 1.1) and long effective contact electrification time. Based on the direct current characteristics, energy harvested from rainwater can be fed directly to electronic devices and a self-powered rainfall sensor can also be implemented. This study highlights the promise of all-liquid systems in distributed green energy and passive sensors, offering a new perspective on self-powered devices.
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