ABSTRACT
Fuel cells are devices for electric power production. Similar to their classical counterparts which are based on a cycle process, they convert chemical energy (usually the enthalpy of combustion of a combustible substance) into electric energy. The substantial difference between these two classes of processes is that cycle processes usually use three energy transformation steps-from chemical enthalpy to thermal, then kinetic, and —nally electric energy-whereas fuel cells directly convert chemical into electrical energy and thereby offer a chance to obtain higher degrees of ef—ciency [1-4].
