Exploring Raindrop Energy Harvesting using Reverse Electrowetting on Dielectric and Triboelectric Effect

Reverse electrowetting on dielectric (REWOD) and triboelectric nanogenerators have emerged as prominent developments in the field of droplet-based energy harvesting. Leveraging the triboelectric effect and kinetic energy of raindrops, this paper aims to examine a method of performing REWOD on raindrops while eliminating the need for a bias voltage and external mechanical modulation. The model presented in this paper mimics the typical REWOD set-up, modified to accommodate raindrops - with rainwater as the electrolyte, an aluminum bottom electrode coated with a dielectric (polydimethylsiloxane) and a top electrode fabricated in the form of a lattice. While the contact angle of water on polydimethylsiloxane has been measured and the bounce mechanism of water drops falling with varying velocities on the dielectric have been recorded, the voltage generated could not be measured or amplified due to limitations in the technology available. The paper discusses the rich future prospects, with potential improvements in the experiment design.