ABSTRACT
Fossil fuels including coal, oil, and gas, which we heavily depend on, can cause air pollution and greenhouse gas problems. A recent study [1] shows that about 18% of CO2 (carbon dioxide), greenhouse gas, is emitted by motor vehicles. The development of fuel cell powered vehicles (FCVs) is very important to our environment and even our economy, especially for a soaring oil price currently. The fuel cell system is widely regarded as one of the most promising energy sources thanks to its high-energy efficiency, extremely low emission of oxides of nitrogen and sulfur, very low noises, and the cleanness of its energy production. Furthermore, a fuel cell system can operate with other conventional and alternative fuels such as hydrogen, ethanol, methanol, and natural gas. On the basis of the currently used types of electrolytes, fuel cells are classified into PEMFCs, SOFCs, PAFCs, MCFCs, AFCs, DMFCs, ZAFCs, and PCFCs [1].
