Hydrogen is highly flammable, so not very safe. Besides, to mass produce hydrogen would still require electrolysis and hence vast amount of electricity.
Nuclear is the only carbon neutral realistic option. But japan and germany have decided to ditch it causing spike in lng price since 2012.
Hydrogen if produced by green renewable sources, will be able to produce just 20MT from 1200MWhr of electricity at maybe 75% efficiency of electrolysis machine. If stored, its quite a big volume due to its low density.
Storing hydrogen in pressurised containers need 700bar requiring huge smount of energy. Losing maybe 3% per day due to its puny nature.
Or cryogenic tsnks st -253 deg C.again huge amount if energy required.
Or convert hydrogen into green ammonia gas which is snother energy consuming process.
But a new revolutionary process has been announced that actuslly stores hydrogen at ambient pressure and temperature. Due to this nature its light and can be transported easily with zero loss. Lets see how this transpire.
Using hydrogen to produce electricity from fuel cell means another 20% drop in efficiency.
Currently Nothing can beat coal, oil and gas from nature as its found free and already processed and ready to be used.