China Tests Floating Devices That Turn Raindrops into Electricity
BEIJING – Chinese researchers are piloting innovative technology that harvests energy from raindrops, potentially offering a new source of renewable power and addressing energy needs in remote or disaster-stricken areas.The devices, developed by researchers at Soochow University, utilize triboelectric nanogenerators (TENGs) – a technology that converts mechanical energy into electricity – encased in floating, spherical structures.
The breakthrough comes as China continues to aggressively pursue diverse renewable energy sources, investing heavily in solar, wind, and now, atmospheric energy harvesting. While the energy generated by a single device is currently small, the potential for scalability and deployment in regions with frequent rainfall could significantly contribute to localized power generation, particularly in areas lacking established grid infrastructure or facing emergency situations. The technology offers a novel approach to energy independence and sustainable power solutions.
The TENG technology relies on the contact and separation of two different materials, creating a static charge that can be harnessed as electricity. Researchers encapsulated these generators within lightweight, buoyant spheres – approximately 10 centimeters in diameter – allowing them to float on water surfaces and capture energy from falling raindrops. According to a study published in ACS Nano, a single sphere can generate up to 150 volts and 100 microamps of electricity from a single raindrop.
“The key innovation lies in maximizing the contact area between the raindrops and the TENG material,” explained Professor Wang Zuankai, lead researcher on the project, in a statement to Chinese state media. “By utilizing a spherical structure, we can effectively capture energy from raindrops falling from any direction.”
The research team is currently focused on improving the efficiency and durability of the devices, as well as exploring methods for large-scale production and integration with existing energy storage systems. Future applications could include powering remote sensors,emergency lighting,and even small electronic devices.The project aligns with China’s broader goals of achieving carbon neutrality by 2060 and diversifying its energy portfolio.