The polymer electrolyte membrane fuel cell (PEMFC) is widely regarded as a potential power source for portable and mobile applications, due to its noteworthy features of high efficiency and zero emission. Successful start-up from subzero temperatures is of paramount importance for the commercialization of PEMFCs for practical applications, such as backup power and automotive applications. [...]

The increasing energy demand and the contemporary concern about urban environment raised the necessity to develop a hydrogen-based economy; it requires the development of hydrogen storage technologies. Hydrogen can be stored and transported in different ways, each one showing advantages and disadvantages: as compressed gas, in liquid form, as metal hydride. In carbon nanotubes, in [...]