It works just like a hydrogen fuel cell except that the liquid used for storing energy is saltwater. This isn’t far from the water powered car, an idea labelled as a conspiracy by many despite the massive amount of evidence behind it.
In this case (saltwater) the liquid passes through a membrane in between the two tanks, creating an electric charge. This electricity is then stored and distributed by super capacitors. The four electric motors in the car are fed electricity which makes it run.