By 2050, the global energy demand could double or triple and oil and gas supply is unlikely to be able to meet this demand. Hydrogen and fuel cells are considered in many countries as an important alternative energy vector and a key technology for future sustainable energy systems in the stationary power, transportation, industrial and residential sectors (European Commission, 2003; US Department of Energy, 2004). However, as with any major changes in the energy industry, the transition to a hydrogen economy will require several decades