But again, I say IF you can afford it, as palladium is right up there with platinum as far as price goes.  

Otherwise, research continues on metal hydrides that are capable of absorbing a great amount of hydrogen.  Unfortunately, my impression was that most of these compounds are proprietary, and are still in research and development phase, so good luck finding information about them.  If you DO find some info about specific metal hydrides, be sure to post them on here, I'm sure a lot of people would be interested to know.

Oh, here we go, I found my link!

Cheers

Yep.
All depends how it's looked at really though.
 Considering Hyrdrogen as storing energy may not be efecient in itself, but considering hyrdrogen as a fuel could be. Not all things are equal even though it seems that's whats they try to teach.

 So I would probably not use a wind mill to create hydrogen, then burn that in a gennie to create electric for normal use. Not very efficent at all.

Now on the other hand, if I could use a water tank as a dump load for when my batteries are fully charged and I have tons of wind left over, then it may be effecient compared to just not using the wind at all durring that time.
 Adding more batteries of course is not a solution just because the wind blows harder than normal for 3 days in a row once in a while. So electrically creating hydrogen durring that time and storing it till the wind stops, then using it to run a gennie would be far better and more effiecent than just shutting down the windmills. Also shutting down a windmill does nothing to give you power when the wind does not blow for the next 3 days!
 So in that manner it is more efficient than nothing at all, and what else would you use that extra electric for? Heating water?

Also another point on extra power is if your currant battery bank stores enough power normally then adding more batteries is a waist anyway. You can charge them till they're full, but you won't use it anyway if half as many batteries were already meeting your power needs. So that would be no more effiecent than making Hydrogen.

Using it as a dump load then as a fuel to drive your car. That would be better also if you could do it. In such a case your not really storing the energy as it was in it's first form. No matter how many amps or how many Volts you run into the cylinders of your car the engine is not going to turn!! :)
 It takes a feul which will ignite and expand to move that cyclynder downwards. Not electric.

That's something that used to bug me about science class and such in school. Basically the fact most the teachers always claiming an internal combustion engine runs on heat. Duhh, sorry, I can heat the cylynders and pistons with a Acetolene torch till they melt, and they ain't gonna move till they start to drip!! Now that's HEAT! An engine does not run on heat, heat is created though when the engine runs. Heat is a by product of the burning of the fuel. It is the presure and expansion of that feul that runs the engine, not the heat that was created! If we ever find a fuel that gets cold as it explodes and expands the same engine will work just as well! Of course your cars heater won't :)

"As storing hydrogen is difficult/expensive, an 'on demand' production system could easily be made...
...to start production a chunk of al is lowered into lye solution, to stop production, the al is lifted out...
...electricity and heat could also be extracted during hydrogen production.
An efficient use of resources? and What would happen to the waste products?"

Pretty much what I have in mind with the post about my experments eventaully.
Yes efficient due to the fact we can use garbage that is thrown away daily.
Waste product? Basically an aluminum ore as I understand it, so it could be recycled.
No mining or other difficulties in producing new aluminum from this ore, simply ship back the used stuff to a loction with plenty of free wind/solar/water power (which might otherwise be unused) to refine back into more aluminum again for a new product to be made so we can use the trash for feul :)

OR? How hard can it be to refine it back into aluminum again to recycle at home?
 Think about it. Could it be as basic as running a currant though it to release the oxygen that caused it to oxydize? Probably not. But if so (or not much more) you could put up a few extra windmills leading to a storage tank where you dump your used ore. Next big storm you'd have free fuel sitting waiting to be used again. Random high winds or long periods during storms aren't much good in normal daily use, but for something like this where you don't have to worry about a daily need they could be very usefull to use at random. I mean you use scrap aluminum as neeed on a daily basis, let the ore sit as long as needed. Use it just when ever it's ready again, no rush.
And most likely you would have a nice uniform powderd form to use also.
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nothing to lose