Bob Lazar has a hydrogen powered corvette. He also built his own particle accelerator to produce lithium-6 deutirde to help store the hydrogen. This is the fellow that used to work with UFO engines at Area 51.
He says that “Lithium-6 deutirde, the hydride material used in thermonuclear weapons was devised as a means to store hydrogen more efficiently and safely. The law forbids purchasing it at any cost. However, the law does not forbid making it.”
Bob Lazar runs a company called United Nuclear that sells kits to convert cars from gasoline to hydrogen power. United Nuclear also sells a variety of materials including radioactive ores, powerful magnets, scientific curiosities like aerogel, and a variety of lab chemicals.