The depletion of fossil fuels and climate changes caused by greenhouse gases are boosting increasing research efforts to find out alternative energy sources and technologies. Among these, fuel cells are receiving much attention for their efficiency as well as the capability to use, besides hydrogen, a variety of renewable fuels such as alcohols and carbohydrates. Fuel cells of which there exist different types according to the electrolyte employed, working temperature and fuel, are electrochemical devices that directly convert the chemical energy stored in a fuel into electrical energy with...