Comment Hydrogen cars = doomed. (Score 1) 293
There is no chance of a hydrogen economy. The production of hydrogen by electrolysis is then followed by a compression stage to 5000 psi (now there is a bomb for you!!!). This energy of compression is mostly lost, about 30% could be recovered by letting the hydrogen for the fuel cells de-compress (expand) via a small turbine. This electricity can be stored in a battery to assist the fuel cell electricity storage. The production of hydrogen by electrolysis or from coal/coke is very inefficiecnt
Hydrogen has the widest known explosive range of any gaseous fuel, so any leaks will constitute a great risk of explosion - far worse than the Tesla. A car full of compressed hydrogen, refilled and used again and again, is sure to leak. Sure they will put some sticky tracer in the hydrogen so you can smell it, but it can still detonate with the tiniest spark.
Lithium or other future batteries will block any chance hydrogen has of success. They might get fully swappable lithium batteries in quick swap battery cases, so a battery change takes a minute or so - much like a fill up of gas.
Capacitors will never work, the energy density is too low, Capacitors are the functional equivalent of a spring - fast, but not large enough.