Nippon Telegraph & Telephone Corporation (NTT) has developed N a tiny, direct-hydrogen fuel cell for cellular phones. Directhydrogen fuel cells have higher power output than most methanebased cells. This allows them to be built smaller but still provide the same performance as a methane-type fuel cell. NTT has built a prototype that weights 104 gms, measures 4.2×8 cm and is only 1.3 cm thick. The device is larger than the lithium-ion battery typically built into a cellphone, but it can power nine hours oftalktime, compared to the normal two hours. NTT plans to have a practical version of its new fuel cell ready in two to three years.
