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Theoretical (thermodynamic) and experimental backgrounds are considered for developing a much simpler, more technological and effective method (in comparison with the known megabar compression dynamic and static meth- ods) of producing a high-density solid molecular ("reversible") hydrogen carrier by means of hydrogen intercalation (at the cost of the hydrogen association energy) in carbonaceous nanomaterials (between graphane-like layers) at relevant temperatures and pressures. As is shown, one of the processes of chemisorption of hydrogen in carbonaceous nanomateri- als may be related to formation of graphane-like (carbohydride-like) complexes and/or multilayer graphane-like nanos- tructures. In this connection, some aspects of the graphene/graphane problem are considered, as well. By using gravimet- ric and electron microscopy data, the density values ( H = 0.7±0.2 g(H2)/ 3 (H2), and  *H = 0.28±0.08 g(H2)/ 3 (system) - the "volumetric" capacity) of the intercalated solid molecular ("reversible") hydrogen (of a high purity) in graphane-like nanofibers ( 15 mass % H2 - the "gravimetric" capacity) have been defined. It is a much more acceptable, safe and effi- cient technology, in comparison with the current technologies of composite vessels with high hydrogen pressure (about 80 MPa) and the current space cryogenic technologies of hydrogen on-board storage in fuel-cell-powered vehicles. It exceeds and/or corresponds to the known U.S. DOE requirements-targets for 2015, with respect to the hydrogen capacities, safety, reversibility and puirity.

The High-Density Hydrogen Carrier Intercalation in Graphane-Like Nanostructures, Relevance to its On-Board Storage in Fuel-Cell-Powered Vehicles