Water droplet-driven triboelectric nanogenerator with superhydrophobic surfaces

Jeong Hwan Lee, Seong Min Kim, Tae Yun Kim, Usman Khan, Sang Woo Kim

Research output: Contribution to journalArticlepeer-review


A bouncing water droplet not only contains mechanical energy, but also electrostatic energy due to the triboelectric charges on its surface that are generated by its contacts with the surrounding environment. Here, we report development of contact electrification-based water droplet-driven triboelectric nanogenerator (Wd-TENG) for harvesting energy from the water-droplet bouncing between two superhydrophobic surfaces. The Wd-TENG consists of polytetrafluoroethylene balls on the bottom and zinc oxide nanosheets on the top; two surfaces of the device obtain electric energy during the contact electrification from the bouncing water, and additionally, maximize the bouncing motions of the droplets. The device produced a short-circuit current and an open-circuit voltage of 1.3 μA and 1.4 V, respectively. Besides, power-generating performances of the Wd-TENG at various angles of inclination were also investigated, and it showed voltage outputs of 5.5 V, 16 V, 9.8 V, and 6.8 V at the inclination angles of 52° 58° 64° and 70° respectively. These results demonstrate that the Wd-TENG is potentially a strong candidate for scavenging energy from raindrops.

Original languageEnglish
Pages (from-to)579-584
Number of pages6
JournalNano Energy
Publication statusPublished - 2019 Apr

Bibliographical note

Funding Information:
J. H. Lee and S.M. Kim contributed equally to this work. This work was supported by the “Human Resources Program in Energy Technology (No. 20174030201800 )” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea), the GRRC Program of Gyeonggi Province (GRRC Sungkyunkwan 2017-B05 ), and Korea Electric Power Corporation (Grant number: R18XA02 ) S. M. K acknowledges a financial support from National Research Foundation of Korea (No. 2017R1A2B4010642 )

Publisher Copyright:
© 2019

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering


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