Honda Clarity fuel cell car

Honda's hydrogen fuel cell Clarity, goes 100 mph top speed and acts like a regular car but will only be available in California in 2008. California is the only state with a hydrogen infrastructure large enough to handle a large scale lease.

How it's fuel cell system works...

Inside each cell, hydrogen gas reacts with a hydrogen electrode, causing a catalytic reaction that ionizes the hydrogen atom (electricity is of course nothing but flowing electrons). The electron-less atom (ion) next bonds with oxygen to create water, which recirculates through the stack to keep the electrolytic membranes damp, before exiting the vehicle through the tail pipe. In turn, the fuel cell stack powers an electric motor, which drives the front wheels. There is also an auxiliary lithium ion battery to store extra juice created by the stack, the motor (which behaves like a generator when decelerating) and additional energy gathered from the regenerative braking system. The battery is used during start-up or to assist the engine if the demands of the right foot exceed the power output of the stack. jalopnik.com