A team of researchers from MIT found that when water droplets jump away from superhydrophobic surfaces during condensation, they are able to capture a small amount of electricity that could be used to power electronic devices.
The researchers are currently developing a passive device that contains two arrays of interleaved metal plates that may be able produce at least 1 microwatt per square centimeter. The system would need to be used in a location with a humid environment, but also have access to a place where the air temperature is colder than the surrounding air. This process could lead to a way to charge cellphones or other electronics in remote locations, and could also be used to produce clean water.
Read more about the device being developed at MIT to harness electricity from water droplets during condensation.