New developments in hydrogen fuel cells

Proton-exchanged membrane fuel cells operating at a temperature lower than 200°C have been gaining interest from researchers all over the world because of their potential of a wide range of applications. In this chapter, the improvement of proton conductivity polybenzimidazole and Nafion-based membranes is focused because they represents the trends of H2-O2 fuel cells operating at temperatures lower and higher than 100°C. Despite the vast number of publications reporting the materials that can enhance the membrane protonic conductivity, they can be divided into two groups, that is, nonconductive and conductive materials.