Miniature fuel cells can deliver up to 60 mW at about 0.5 to 0.7 V. The project objective is to build a power converter that takes this input and delivers 3 V dc to provide a battery substitute for a PDA or iPod. The converter must be at least 70% efficient with 0.6 V input at 60 mW.
What is fuel cell ?
By wikipedia and
Project Related PDF's :
Power converter for micro fuel cells
Other Useful links :
Basic overview of fuel cell technology
A new way to build membrane for fuel cells
Videos related to fuel Cells :
How Fuel Cell Works?