Fuel cells which convert chemical energy directly into electrochemical energy with high efficiency and low emission of pollutantsencompass the alkaline fuel cell (AFC), the polymer-electrolytemembrane fuel cell (PEMFC), the phosphoric-acid fuel cell (PAFC),the molten-carbonate fuel cell (MCFC), and the solid-oxide fuel cell(SOFC) [1]. Each fuel cell has its own characteristics such as theoperating temperature, kinds of fuel and electrolyte.