Since you know so much about it Smurf, do you know what the issues are, if any, with the leftover by products after extracting hydrogen from natural gas? I mean, hey, it can't be good! has to be some bad stuff remaining, like CARBON!
OTH, using water leaves us with oxygen. Not bad. Not bad. Besides, water is a lot more plentiful than nat gas. Transportation logics and extraction issues are greatly reduced
by sourcing hydrogen from water, right?
With nat gas, there is danger on either side of the extraction, whereas with water, the danger is only with the hydrogen.
When water AKA H2o Two hydrogen Atoms and One Oxygen Atom are separated via introducing a voltage to water AKA Electrolysis, there are no drawbacks.
The only drawback is as mentioned with regards to the efficiency conundrum, where the energy used to produce hydrogen to use hydrogen, comes short when that hydrogen energy is to be utilised, thus it would have been better to use the energy directly.
But here's something interesting to consider, there is an advantage if the energy to split water is sourced via solar Energy because the losses are no where near to the losses that Grid connected energy producers have to contend with.
For example lets say we have 5~10 Kw of solar panels - to which if all that energy is used to create and store enough hydrogen to power a 4~7 Kw generator for a couple of days, then obviously all our energy should be covered - No need to be grid connected unless forced by whatever laws, to which would need the system to be large enough to cover whatever forced connection fees apply.
So obviously the advantage is that all the energy produced during the day is not lost to greedy energy retailers who are only paying anything from 1% to 8% of what they charge, when that energy is fed back, which can be anything from 4 to six times than what you forcefully got for it..
Mind you had you go-ogle "Cheap, Deep-Cycle & Long Life Batteries" 6 months ago and then again today, it should be obvious - it wont be too long before everyone with a solar System will be in the position to store all produced energy and even go off the grid, that is if the connection is not enforced.
And if it is - and seeing how greedy those energy companies are - One may have to source a system that includes wind power - which for now a 7Kw system may get most of us by, but give it a year and it may need 20 to 30 Kw systems to cover that forced grid connection
But if that grid connection is not enforced - it would mean we're not that far away from Energy companies greed seeing them being totally redundant if their rates remain as ridiculously unfair as they are now.
The only way for them to survive is to ensure a fairer exchange rate to what it is now, and the quicker they act on this the less likely those batteries will end up being relied upon..