New Fuel Cell Could Finally Make Electric Flight Feasible

Electric flight has long been a dream, but engineers have faced significant challenges. Current batteries are too heavy, making electric planes impractical. However, MIT researchers have developed a breakthrough fuel cell using liquid sodium, which stores three times more energy per kilogram than today's best batteries.

The fuel cell operates by reacting liquid sodium with oxygen from the air, generating electricity. Unlike traditional batteries, it can be refueled quickly by replacing sodium cartridges. This innovation could revolutionize regional flights, which account for 30% of aviation emissions.

Safety and scalability remain challenges, but the team has founded Propel Aero to commercialize the technology.