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I would recommend against anything involving hydrogen cells at this point unless you get the kind that does not directly use hydrogen gas. First of where will you get the hydrogen gas and how you will store it. You won't know if it's leaking until it explodes. Unlike other gases, hydrogen's size actually makes it particularly hard to add an odor for safety. There has to be regulations concerning this.
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Hello!
I did a huge science fair project on hydrogen, and let me tell you, it's not so bad. For one thing, pure hydrogen, as it's stored, CANNOT and WILL NOT explode. Really. You need oxygen, and even then, you'd need quite a bit of it in a sealed container to get an explosion. Another thing: Even if hydrogen is leaking, it will not explode. It will burn, given the proper heat source, but unless it's under pressure, it will not explode. Thirdly, even if you have a leak, gases such as propane are much more dangerous because hydrogen is lighter than air, and will float way high, maybe to burn, maybe not. Propane will rest on the ground, and may burn, and when it does, you have a pool of fire next to your leg. While it's true that hydrogen does have problems with odors, places like welding shops have found ways around that. I personally have no idea how they do it, but you could probably ask.
My project was on converting an internal combustion enginer (a one-banger) to run on hydrogen. We had many problems, mostly owing to the carbon buildup on the cylinder, but for the most part, even when it backfired and flames came out of the intake manifold, we were in no particular danger. In my opinion, where there are probably those more experienced than me, hydrogen is safe, as long as saftey measures are followed.
Sparks