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The process of hydrogen absorption by the metal hydride produces heat that slows down the process and at least 40 minutes would be needed to fill a hydrogen tank that allows a traveling distance of 300 miles. With the special heat exchange and removal system similar to what's used in refrigerators plus cooling fins, the time needed to get a full tank is reduced to only 5 minutes, almost the same as what's needed to get a gasoline tank full. This is what would make the hydrogen car practical and ready for commercial production.
The hydrogen gas is used to power fuel cells that run the electric motor of hydrogen cars. The main advantage of using these electric-hydrogen cars is it produces zero emissions with only water vapor as the byproduct of the energy conversion needed to run the car. Water or course, is harmless and is beneficial for life on earth. There's now a system being developed that can extract hydrogen from urine. This is a good way to make hydrogen gas cheap and readily available. People and animals like cows produce tons of urine everyday and they are good sources of hydrogen.
If all cars used hydrogen fuel, the world would indeed be a better place with air that's more breathable. With the practical technology for hydrogen production and storage and now available, tomorrow looks very green.
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