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Its 100-kilowatt modules have been sold to Google, eBay, and Walmart.
A new process makes regenerating hydrogen fuel more efficient.
A platinum-free liquid cathode could cut fuel-cell costs by 40 percent.
Despite doubts about its feasability, hydrogen is finding its way into niche applications.
A high-power cell uses materials already on the market and operates at lower temperatures.
The material could replace platinum in hydrogen vehicles.
Carbon nanotubes could replace expensive platinum catalysts and help finally make fuel cells economical.
A new catalyst could make ethanol fuel cells practical for portable gadgets.
A prototype fuel cell runs on a wide range of fuels without turning up the heat.