Journal
APPLIED ENERGY
Volume 206, Issue -, Pages 432-438Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2017.08.211
Keywords
Energy harvesting; Air bubbles; Triboelectricity; EDL modulation; Embedded charges
Categories
Funding
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future planning [NRF-2014R1A2A1A11054392, NRF-2016H1D3A1938043]
- National Research Foundation of Korea [2016H1D3A1938043] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Technology to harvest electrical power from waste micro-mechanical energy is increasingly in demand. A promising approach lies in manipulating the electrical double layer on hydrophobic surfaces; however, the underlying mechanism is still unclear. Here, we demonstrate that ascending air bubbles in water can produce electrical power in a mode similar to other systems that use descending water droplets. Although the two systems, which are analogous to electrons and holes in semiconductors, are similar in fundamental principle, their detailed electrification mechanisms are significantly different. In the air bubble system, only the pre-existing charges on the surface are involved. However, electrification in the water droplet system is dominated by triboelectric charges accumulated on the surface over time. An air bubble can produce a maximum of nine times more energy than a water droplet due to its advantages in terms of its geometry, hydrodynamics, and electro-circuitry. We also suggest an innovative approach to improve energy-harvesting efficiency using artificially embedded charges.
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