Hydrogen in alkali-metal-graphite intercalation compounds

Abstract The sorption and desorption of hydrogen by alkali-metal-graphite intercalation compounds (AGICs), MC 8 and MC 24 (M = K, Rb and Cs), were studied by the constant-volume closed method and mass-analyzed thermal desorption spectroscopy. Three forms of hydrogen were detected in KC 8 H x and KC 24 H x , while two forms in RbC 8 H x and one form in RbC 24 H x were detected. The energy diagrams for the systems composed of AGICs and hydrogen demonstrate that the type of alkali metal intercalated in graphite and the stage structure of AGICs have greater influence on the absorption process than on the adsorption process of hydrogen.