Produced by a German company called Quant, with NanoFlowcell of Switzerland, the vehicle was made street legal in Europe a few years ago, the vehicle is equipped with an electrolyte flow cell power system with the power to generate an impressive 920 horsepower (680 kW). It pushes 0-62 mph in 2.8 seconds and can achieve a top speed of 217.5 mph.
The Quant uses salt water to generate power. Not in the same sense as consuming gasoline like a traditional vehicle. NanoFlowcell of Switzerland describes best how this system works.
“There have been previous claims for engines that can run on salt water or fresh water. These claims are usually based on the electrolysis of water into hydrogen and oxygen, then using that hydrogen as fuel, burning it back with oxygen to make energy and water. The problem with using electrolysis of water as fuel is thermodynamics – it has to take more energy to split the water in the first place then you can possibly get back by burning the hydrogen back with the oxygen.
The QUANT e, however, does not use this method. Rather, it uses nanoflowcell technology. This is essentially a battery that uses salt water solutions to store electrolytes that can undergo reactions to produce electricity.”
It's a touch more scientific than I can fully understand. But it's certainly an interesting fuel alternative. We have literal oceans of salt water, after all.