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The technique of hydrogen vehicles

When talking about hydrogen vehicles, it is about vehicles with an electric motor. The electric motor is powered by a Fuel Cell. A Fuel Cell is a device where gaseous hydrogen and oxygen enter and electricity and (a tiny bit) water comes out.

Hydrogen is made by splitting water with electricity. If this split happens with so-called “residual energy” from wind turbines or solar collectors, you speak of green hydrogen.

Hydrogen can also be made by so-called steam reforming, then natural gas is heated with very hot water vapor.


Hydrogen buses are quiet, safe, quickly refueled and can travel just as far as buses with a traditional combustion engine. Precondition is good tank facilities are available. ZETT takes care of this.
A common point of discussion is the efficiency of hydrogen vehicles especially compared to battery vehicles. There is still a lot of misunderstanding about this. In the figure below the efficiency of hydrogen vehicles is compared with other techniques.

If you start with the same amount of fuel at the source, ultimately the efficiency of a hydrogen vehicle is 40%. For a conventional car, this is only 20%. Nobody ever mentions this!

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Well-to-Wheels Vehicle Efficiency Comparison

(Source Toyota)