Electric bicycle
In a fuel cell the hydrogen is recombined with oxygen in the air: the results of this process are water vapor and electrical current. The hydrogen is stored in a small tank of metal hydride, a metallic powder that acts like a sponge: it absorbs up to 650 times its own volume of hydrogen, contains and releases it at very low pressure (about 5 bar static pressure and 25 bars of issue).
This system is absolutely safe.
With 600 litres of hydrogen (1 litre metal hydride tank) for example, the bike in the picture can go almost 100 Km at the legal speed of 25 Km/h. The tank can be recharged at home in a few minutes and for a few cents.
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