At EDANA's nonwoven technology conference in Vienna (June 2006)Klaus-Dietmar Wagner of Freudenberg GmbH said 11,000 fuel cells were built in 2004, up from 1000 in 2000. The most promising cells are the Polymer Electolyte Membrane (PEM) varieties which rely on membranes to transport protons, insulate anode from cathode and separate the gases between anode and cathode. 
The Fuel Cell Alliance road map to 2015
PEM Fuel Cells: Timing and target cost
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