Make Hydrogen On Demand from Activated Aluminum and Water. This invention has been patented!
I use a drop of liquid metal that I bought from eBay and aluminum from a soda can to produce hydrogen from water.
This reaction solves the problem of hydrogen storage for the hydrogen economy. Energy dense activated aluminum acts as the storage medium, liberating hydrogen on demand when exposed to water.
After the exhaustion of the reaction, the resultant aluminum oxide (alumina) is shipped to a power generator plant that reduces it back to aluminum. Since alumina is a suspension in water it can be delivered via pipelines to the power station.
Liquid metal is available here: http://www.google.com/products?q=Coollaboratory+Liquid+Pro&hl=en&aq=f
It is usually listed on the internet as Coollaboratory LiquidPro Fluessigmetall Waermeleitpaste
My other Instructables: MAKE A HIGH VOLTAGE SUPPLY IN 5 MINUTES Hack The Spy Ear and Learn to Reverse Engineer a Circuit Super Easy E-mail Encryption Using Gmail, Firefox and Windows Make a Voltage Controlled Resistor and Use It Make a Ball Mill in 5 Minutes Make a Rechargeable Dual Voltage Power Supply for Electronic Projects