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If you split H2O into H2 and O2, you find that O2 is something you can breath. Then, you have H2.
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You need as much energy to split H2O into H2 and O2 as you get from "burning" H2. You lose a bit of energy along the way as heat but you won't get additional energy in the process.
If you want to lunch a spaceshuttel the price of the energy that you need to split the H2O is pretty cheap compared to the other costs that you have when you want to build spaceshuttels. That doesn't mean that it's a cheap way to fuel other vehicals.
Compresed air doesn't pollute either directly.
Lithium Ion batteries also don't pollute as long as they get recycled afterwards.
Neither compressed air nor lithium ion batteries have a energy denseity that make them a viable choice for spaceshuttels.
Finding something that works for spaceshuttels is a different problem then the problem of finding a good fuel for vehicals.