Also: What is Electrolysis?
Solar Power is pretty nifty, and Horizon's hydrogen fuel cells are a definite glimpse into the future of clean energy. But I recently stumbled across a green energy solution on Yanko Design that blows both of them out of the water.
Rather, out of the water and bio-ethanol. That weird three-legged charging stand uses energy made during electrolysis to juice up your phone or PMP. Electrolysis occurs when oxygen and hydrogen are combined in ethanol. So all you'd need is to fill one cylinder with water and the other with your bio-ethanol solution.
This technology exists today- you can go here for a detailed look at how the science works- but it is unclear how far away a convenient consumer application like this might be. I didn't expect to see portable hydrogen cells and chargers at CES 2011. So surprise is always in the cards.
If you'd like a deeper look at electrolysis, I found this excellent video of a home-made generator that seems to be legit. Check it out!