Preparation of graphite supported Li-N-H hydrogen storage material from Li-graphite intercalation compound and their unique hydrogen release property

摘要

A highly dispersed Li-N-H hydrogen storage material supported on graphite was prepared from a Li-graphite intercalation compound with ammonia, and their hydrogen release property was investigated. In addition, the changes of the chemical state of the lithium species responsible for hydrogen storage/release were investigated using 7Li NMR and XRD. Those spectral analyses revealed that the graphite supported Li-N-H hydrogen storage material released hydrogen at lower temperature than in the absence of graphite support and Li3N was directly formed in one single step without going through the formation of Li2NH. Also we found that durability to hydrogen storage/release cycles was improved in the presence of graphite support.