Abstract
Hydrogen trapping sites in hydrogenated nanostructured graphite (HNG) prepared by mechanical milling under hydrogen atmosphere were intensively studied with transmission electron microscopy (TEM) and electron energy-loss spectroscopy (EELS). Measurements of σ- and π-plasmon dispersion and 1s→2p* excitation spectra of the graphitic matrix suggested the existence of at least two types of hydrogen trapping states: one was the conventional C–H covalent bond, and the other was related to the π-orbitals of the carbon atoms extending normal to the graphene layers. We found that iron carbide particles incorporated as contamination during the mechanical milling also stored a significant amount of hydrogen, as revealed by the change in the Fe-L2,3 spectrum when the sample was annealed. We re-assigned the assumed hydrogen trapping sites to the hydrogen desorption peaks in the thermal desorption spectrum (TDS) based on these experimental results.
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