A real winner in the green stakes - 95% of hydrogen today is made using natual gas (not green!) as a base, and the processing, compression and storage of the gas at high pressure takes a huge amount of energy before the fuel is even put in the vehicle.
Only when the hydrogen is made by electrolysis using renewable energy will it be green. Or the egg heads may come up with a better way of hydrogen production possibly using algae although this is may be decades away.
By then we will need to seriously question whether a hydrogen based vehicle offers any real benefit over electric in terms of cost, safety, range etc.
Quite right.
HJ reported about how Toyota were using the electrolysis method to split off hydrogen from water to power six pallet liefters for a day. Trouble is that it needed a huge PV array, which would likely generate enough electricity to power the equivalent EV versions and much more, and the 'filling station' was quite large as well.
Now imagine what would be needed (and access to huge amounts of water, 24/7) to do the same for the average daily usage of an 8-pump small filling station serving an average sized town. I shudder to think what the size of the PV array and high pressure hydrogen storage tanks (never mind the consequences of a leak or, God forbid, an explosion) or having a piped system like with natural gas would be.
en.wikipedia.org/wiki/Fuel_cell#Fueling_stations
en.wikipedia.org/wiki/Hydrogen_station
Besides, areas further inland would either have to use (already scarce) fresh water supplies, inconsistent rainfall captured (more cost for that) or pump in either seawater from the coast or have a potentially very dangerous (far more than natural gas as it's under much higher pressure and more prone to leaks) centrally-piped distribution system.
To me, it's telling that in 2016 (see first wiki page) that Samsung dropped out of the fuel cell market because the prospects didn't look good. Things may eventually get better, but, like with EVs, the issues surrounding the tech's implementation are the real sticking point, not the concept itself.
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