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Energy harvesting using air bubbles on hydrophobic surfaces containing embedded charges

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  • Wijewardhana, K. Rohana
  • Shen, Tian-Zi
  • Song, Jang-Kun

Abstract

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.

Suggested Citation

  • Wijewardhana, K. Rohana & Shen, Tian-Zi & Song, Jang-Kun, 2017. "Energy harvesting using air bubbles on hydrophobic surfaces containing embedded charges," Applied Energy, Elsevier, vol. 206(C), pages 432-438.
    • Handle: RePEc:eee:appene:v:206:y:2017:i:c:p:432-438
    DOI: 10.1016/j.apenergy.2017.08.211
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    References listed on IDEAS

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    1. Guan, Zhibin & Li, Ping & Wen, Yumei & Du, Yu & Han, Tao & Ji, Xiaojun, 2021. "Efficient underwater energy harvesting from bubble-driven pipe flow," Applied Energy, Elsevier, vol. 295(C).
    2. Wijewardhana, K. Rohana & Ekanayaka, Thilini K. & Jayaweera, E.N. & Shahzad, Amir & Song, Jang-Kun, 2018. "Integration of multiple bubble motion active transducers for improving energy-harvesting efficiency," Energy, Elsevier, vol. 160(C), pages 648-653.
    3. Guan, Zhibin & Li, Ping & Wen, Yumei & Du, Yu & Wang, Yao, 2022. "Efficient bubble energy harvesting by promoting pressure potential energy release using helix flow channel," Applied Energy, Elsevier, vol. 328(C).
    4. Helseth, L.E., 2021. "Harvesting energy from light and water droplets by covering photovoltaic cells with transparent polymers," Applied Energy, Elsevier, vol. 300(C).
    5. Guan, Zhibin & Li, Ping & Wen, Yumei & Du, Yu & Wang, Guoda, 2023. "Bubble energy harvesting suitable for weak gas sources using bubble stream release scheme," Applied Energy, Elsevier, vol. 349(C).

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