The rapidly growing worldwide energy needs and the diversification of the energy mix with an increasing share of renewable energies are challenging the existing energy infrastructures. At present, central grids dominate worldwide energy supply and distribution. More flexible solutions are required, especially those that integrate renewable energies more efficiently. In the case that larger energy quantities have to be stored, hydrogen has, in spite of losses during production and reconversion to electric power, a high potential as universal and clean secondary energy source [1-3].
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