Droplet Energy Harvesting Is Reverse Phenomenon of Electrowetting on Dielectric

Gijung Kim, Wonjune Kim, Honggu Chun

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Electric energy is generated when water droplets slide down electrodes coated with a hydrophobic dielectric layer. The principle of energy generation needs to be clarified for the optimization and scalable design of the energy-harvesting system. In this study, it is shown that droplet energy harvesting is the reverse phenomenon of voltage-driven droplet actuation or electrowetting-on-dielectric (EWOD). For this reverse EWOD, the interfacial energy difference generated between the three-phase contact line of the advancing and receding part of the droplet is the cause of the generation of electric energy. To prove the effect of interfacial energy on energy harvesting, the wetting property of the dielectric layer is controlled by nanopatterning while maintaining the chemical properties. The width and gap of the electrodes and the droplet size determine whether the harvested voltage waveform is monophasic or biphasic. The energy conversion efficiency is determined by the wetting properties of the surface, and the maximum value is as high as 40%.

Original languageEnglish
Article number2105233
JournalAdvanced Functional Materials
Issue number43
Publication statusPublished - 2021 Oct 20


  • electrowetting-on-dielectric
  • energy harvesting
  • interfacial energy
  • nanoengineering

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


Dive into the research topics of 'Droplet Energy Harvesting Is Reverse Phenomenon of Electrowetting on Dielectric'. Together they form a unique fingerprint.

Cite this