i have been looking, there is a flashlight using a fule cell already.
I wanted to go backpacking with a weather baloon filled with hydrogen, that would lighten my load. then i could use the hydrogen in the fule cell, and drink the water that comes out 🙂
from what i have seen so far, untill they start sucking the Hs out of gasoline, carrying compressed hydrogen around would be too large of a container. so short runtimes, high weight.
imagine that after YEARS of research, they conclude with putting GASOLINE in the dang things 🙂 alternative energy ooookkkkaaaay.
the problem is most hydrogen is created, it doesnt pop out of the ground, or fly out of the sky, like the magic stuff, so WHERE the heck is Arnold going to get the hydrogen? if you have to make it, it will take about 2X as much energy to make as it outputs? what kind of efficincy would that be???
the only way its efficient is as a storage medium, all the excess energy not being used to light Lost Vegas, could be used to convert water into wine, and in that respect the hydrogen would be usefull when you have other useless alternative energies. like solar, or wind, or when you already got that coal plant fired up and need to toss off some energy.
so that just leaves using ammonia as the hydrogen storage, that would truely solve the problem, just fill up at your nearest farm stall / race horse.
(Conservation is the only SOLUTION, everything else is just making money.)