Lets try some complex things here, I know a little bit about gasses, tanks and pressure. What it means to do all these processes.

First off everything needs to be cleaned, not cleaned like you think but cleaned to the point it wont explode. That means removing all contaminants. Once you do that if you contaminate it for any reason you must reclean it.

Then you have the problem of you wind up with two gasses, oxygen and hydrogen. If you take that at face value you will be able to pressurize this slightly by electrolysis. This means that you need to take that hydrogen and oxygen and boost it to store it. So you go to boost it right? What is the multiplier of the equipment you are using? So you are compressing very little gas expending enormous amounts of energy. I know I do it for diving, its very wasteful but I do not care. I need 3000 PSI Oxygen.

Now assuming you boost all that and have used all this energy to make the hydogen and oxygen, then boost it and what? you tap a tank and its condemned?

DOT has rules for tanks for a reason as well.

As a complement I see it being viable to use hydrogen but it is not the solution. I have never seen one study that actually includes the energy required to boost gas. I think boosting its like 2kw per 20 cubic feet. It is pretty horrid ratio.

So resolve the boosting problem? It might be worth it. Assuming we have free energy from something like waste energy not being consumed. Then it is not waste, it is just using what would be not there.