Liquid Droplet Powered Electricity Generator


a transistor-like liquid droplet powered electricity generator successfully breaks through the research bottleneck of low power density in traditional droplet generators. The proposed generators can produce a maximum power density up to 50.1 watts,increasing the power density and conversion efficiency of the original solid/liquid power generation technology by thousands of times.

  • Liquid Droplet Powered Electricity Generator 0
  • Liquid Droplet Powered Electricity Generator 1
Commercialisation opportunities
technology licensing agreement
Problem addressed

The traditional low-frequency hydrokinetic power generation technology is limited by the interface effect, and its power density and energy conversion efficiency are low.

  • High-density surface can be stored in the Teflon materials owing to its strong electret characteristics.
  • Leveraging on the transistor-like architecture, the surface charges on the Teflon can be efficiently transferes between the electrodes.
  • The hydrophobic Teflon dielectric material enables instant liquid detachment, contributing to continuous power generation.
Key impact
  • The design enables efficient conversion from hydrokinetic energy to electrical energy.
  • The design is simple in preparation and low in cost, and only needs to use common electret materials and metal electrodes.
  • The droplet generator uses green water energy, such as rainwater in the natural environment or fountains in daily life, etc.
  • Gold Medal with Congratulations of Jury at the “2021 Geneva International Exhibition of Inventions”
  • The Best Engineering Solution Award in Chun Wo Innovation Student Awards 2020 (CWISA).


  • US Patent: US 11239786B2
City University of Hong Kong (CityU)

As one of the fastest growing universities in the world over the past decade, City University of Hong Kong (CityU) is recognised as a hub for innovation in research and professional education. CityU identifies solutions to critical global challenges by extending the frontiers of knowledge both within and beyond existing research paradigms.

The University’s highly qualified academics are drawn from all over the world, not only bringing a wealth of research and professional experience to the teaching programmes, but also contributing to the knowledge and technology advancement.