ARMY MOBILITY EQUIPMENT RESEARCH AND DEVELOPMENT COMMAND FORT BELVOIR VA
A fuel cell is a device which produces electricity cleanly, silently and efficiently. Like the familiar dry cells and lead acid batteries, fuel cells work by virtue of electrochemical reactions in which the energy of a fuel and an oxidant are directly transformed into direct current electricity. Unlike batteries, however, fuel cells do not consume the chemicals that are part of or stored within their structure. The reactant chemicals used by fuel cells are supplied from an external source. This feature, in principle, allows the fuel cell to operate as long as fuel and oxidant are supplied and reaction products removed.