These E-Bikes Are Hydrogen-Powered, and You Can Fuel Them Up at Home

[caraher]

4. Where to begin...

Unnecessarily complex and certainly expensive. Wasteful of energy - charging a battery is vastly more efficient use of the electricity than splitting water by electrolysis then recombining the the hydrogen with oxygen to make electricity. Hydrogen does store a lot of energy per gram, but as a gas isn't very dense, so energy per unit volume is likely low compared to a battery, and storing it at high pressure to increase the volumetric energy density can make for a heavy container. Another article (that seems to have a reasonable summary of pros and cons) shows a 600 g weight savings (2.4 kg for the cylinder vs. a 3 kg) compared to a battery with comparable energy storage, but that comparison leaves out the lower efficiency of fuel cells compared to batteries in delivering electricity from that stored energy, so overall you'll get more range per unit weight from a battery than this hydrogen tank.

It's also likely very expensive - to the point that it appears they are not selling these to individuals. Fuel cell technology isn't cheap.