Researchers at Bristol University in the UK recently unveiled the Row-Bot, a small robot with the ability to clean pollution in water. The small robot floats on water and generates electricity by collecting microbes and consuming them in a Microbial Fuel Cell (MFC), which is similar to a digestive system. The power generated is enough to power two paddles, which are used to move Row-Bot and push more microbe-filled water into the MFC.
The Row-Bot is functional in any water, including seawater and waste water. This robot was only a proof-of-concept, but the researchers hope to apply the same principles to land and air based robots in the future.
Source: Science Alert