HT-PEMFCs feature a high degree of carbon monoxide (CO) tolerance and can therefore be operated with low-purity gas (such as reformate gas) [7]. Furthermore, gas humidification is not required (although it is possible and sometimes beneficial [8,9]), since the proton conduction mechanisms differ from those in low temperature fuel cells. Nevertheless, supplying hydrogen to fuel cells is a major issue, as there is currently no infrastructure for its production, storage and distribution, especially in the case of vehicles