Until recently, practical fuel cells have operated only at inconveniently high temperatures. Modern catalyzed cells are approaching room temperature operation -- a highly desirable characteristic in applications such as a laptop PC. There are problems to be overcome. For example, most fuel cells won't work if oriented upside down. They currently (2008) can not be scaled to the small size needed by portable devices such as cell phones. Current designs require venting and therefore can not operate under water. Fuel Cells may not be usable on aircraft because of the risk of fuel leaks through the vents. Technologies for safe refueling of consumer fuel cells are not yet in place.
Fuel cells have been used in exotic applications since the 1950s. For example, they are utilized in manned spaceflight where the reaction product (water) is itself a necessary resource. Fuel cells are cost competitive with gasoline generators in some applications, they are only now approaching practical use in portable devices such as computers. It is thought that once perfected and mass produced, they will offer substantially extended "battery" lives.
Return To Index Copyright 1994-2008 by Donald Kenney.