Droplet Electricity Generators With Maximized Energy Collection Zone Enabled by Aloe-Inspired Midrib and Cuticle

Area of Science:

• Materials Science
• Energy Harvesting
• Biomimetics

Background:

• Droplet electricity generators (DEGs) offer a promising renewable energy source, converting water droplet impacts into electricity.
• Conventional DEGs suffer from limited energy collection areas, restricting their efficiency and scalability.
• Nature, exemplified by Aloe vera's water-channeling structures, provides inspiration for overcoming spatial limitations in energy harvesting.

Purpose of the Study:

• To develop a scalable droplet electricity generator (DEG) with an expanded energy collection zone.
• To mimic the water-guiding architecture of Aloe vera for enhanced droplet transport and energy capture.
• To improve the charge output and efficiency of DEGs through biomimetic design.

Main Methods:

• Designed a DEG incorporating a midrib-inspired curvilinear geometry for uni-directional droplet spreading.
• Developed an artificial hydrophobic cuticle using an OTS-squalane layer for low-retention sliding and interfacial stability.
• Investigated droplet dynamics and charge generation upon impact and sliding on the engineered surface.

Main Results:

• The novel DEG design significantly expanded the effective energy collection zone compared to conventional designs.
• The biomimetic channeling strategy resulted in approximately 236% higher charge output.
• The artificial hydrophobic cuticle ensured robust performance and efficient droplet transport.

Conclusions:

• The developed scalable DEG effectively maximizes energy collection through an artificial droplet-channeling strategy inspired by Aloe vera.
• This approach overcomes the limitations of narrow collection zones in conventional DEGs, paving the way for large-area energy harvesting.
• The findings open new avenues for environmentally adaptive and distributed droplet-energy harvesting systems.