This looks fantastic! It's about time!
A car which uses an electrolyte flow cell power system is now certified for use on European roads. The car is called the Quant e-Sportlimousine, which made its debut at the 2014 Geneva Motor Show.

Not only can this car run on salt water, but it is claimed that the car has peak power of 920 horsepower (680 kW), 0-62 mph (100 km/h) in 2.8 seconds and a top speed of 217.5 mph (350 km/h).