NOVELTY - Hydrogen storage arrangement (S1) comprises electron donor and electron acceptor in solvent, where electron donor contains electron donor metal and electron acceptor contains polycyclic aromatic hydrocarbon and/or an organo radical, where electron donor metal comprises alkali metal, alkali earth metal, lanthanide metal, metal of the boron group and/or metalloid or their alloys, where at least a portion of the electron donor comprising electron donor metal is dissolved in the solvent thereby generating chemical species capable of reacting with hydrogen to store hydrogen in solvent.    USE - As hydrogen storage arrangement to store hydrogen (claimed) used as fuel in fuel cells, batteries, and in compact energy carrier for mobile applications and additional applications associated to the hydrogen economy such as hydrogen-on-demand systems.    ADVANTAGE - The arrangement allows storage and release of hydrogen in an efficient manner. The arrangement allows for higher hydrogen gas uptake in hydrogen storage materials. The storage of large amount of hydrogen allows hydrogen car to drive longer.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) method (M1) of storing hydrogen in hydrogen storage arrangement, involving: contacting hydrogen with the hydrogen storage arrangement (S1), where the contacting is performed to allow reaction of the hydrogen with the chemical species in the solvent of the arrangement to store the reacted hydrogen in the solvent;    (2) a hydrogen storage arrangement obtainable by the method (M1);    (3) a method (M2) to provide hydrogen storage arrangement, involving contacting electron donor and electron acceptor in solvent, where the electron donor comprises an electron donor metal and the electron acceptor comprises polycyclic aromatic hydrocarbon and/or an organo radical, where the electron donor metal comprises an alkali metal, an alkali earth metal, lanthanide metal, metal of the boron group, and/or metalloid or their alloys, and the contacting is performed to allow at least a portion of the electron donor comprising the electron donor metal to be dissolved in the solvent, thereby generating chemical species capable of reacting with hydrogen to store hydrogen in the solvent;    (4) a system (S2) to provide a hydrogen storage arrangement, comprising electron donor containing an electron donor metal, where the electron donor metal contains an alkali metal, an alkali earth metal, lanthanide metal, metal of the boron group, and/or metalloid or their alloys; electron acceptor comprising polycyclic aromatic hydrocarbon and/or an organo radical; and solvent for simultaneous combined or sequential use in the method (M2);    (5) a method (M3) to release hydrogen from hydrogen storage arrangement, involving providing the storage arrangement (S1) at hydrogen storage arrangement pressure; and decreasing the hydrogen storage arrangement pressure to release hydrogen;    (6) a hydrogen generating arrangement (S3) comprising electron donor and electron acceptor provided in solvent, where the electron donor contains electron donor metal and the electron acceptor contains polycyclic aromatic hydrocarbon and/or an organo radical, where the electron donor metal comprises an alkali metal, an alkali earth metal, lanthanide metal, metal of the boron group, and/or metalloid or their alloys, where electron donor metal and electron acceptor are capable to react with the compound comprising a labile proton to generate hydrogen;    (7) a method (M4) to generate hydrogen involving contacting the hydrogen generating arrangement (S3) with a compound comprising a labile proton, where the contacting is performed to allow reaction of the electron donor metal and the electron acceptor with water or the organic molecule comprising a labile proton to generate hydrogen;    (8) a system (S4) to generate hydrogen, comprising at least two of an electron donor and an electron acceptor provided in solvent, where the electron donor comprises an electron donor metal and the electron acceptor comprises polycyclic aromatic hydrocarbon and/or an organo radical, where the electron donor metal comprises an alkali metal, an alkali earth metal, lanthanide metal, metal of the boron group, and/or metalloid or their alloys; and at least one organic molecule comprising a labile proton for simultaneous combined or sequential use in the method (M4);    (9) a method (M5) to store hydrogen in a solvent, involving contacting hydrogen with solvent to allow reaction of the hydrogen with solvent, where the solvent is capable to dissolve at least a portion of an electron donor comprising an electron donor metal suitable in a solution further comprising an electron acceptor, where the electron donor comprises an electron donor metal which comprises an alkali metal, an alkali earth metal, lanthanide metal, metal of the boron group, and/or metalloid or their alloys, and the electron acceptor comprises a polycyclic aromatic hydrocarbon and/or an organo radical;    (10) a solution comprising hydrogen, obtainable by the method (M5); and    (11) a method (M6) to release hydrogen from a solution, involving providing the solutions comprising hydrogen at a starting pressure and decreasing the starting pressure to release hydrogen.