Mini space thruster that runs on water

Credit: URA Thrusters This tiny fingernail-length space thruster chip runs on the greenest propellant of all: water. Designed to maneuver the smallest classes of satellite, the operation of this Iridium Catalyzed Electrolysis CubeSat Thruster (ICE-Cube Thruster) developed with Imperial College in the U.K. is based on electrolysis. Avoiding any need for bulky gaseous propellant storage