Hydrogen desorption property of mechanically prepared nanostructured graphite

S. Orimo, T. Matsushima, H. Fujii, T. Fukunaga, G. Majer

Research output: Contribution to journalArticle

174 Citations (Scopus)

Abstract

Two desorption peaks of hydrogen molecule (mass number=2), starting at about 600 and 950 K, respectively, are observed in thermal desorption mass spectroscopy of nanostructured graphite mechanically milled for 80 h under hydrogen atmosphere. It follows from a combined analysis of thermal desorption mass spectroscopy and thermogravimetry, that ∼6 mass% of hydrogen (corresponding to 80% of the total amount of hydrogen) is desorbed at the first desorption peak as a mixture of pure hydrogen and hydrocarbons. Below the temperature of the second desorption peak, at which recrystallization related desorption occurs, nanostructured graphite is expected to retain its specific defective structures mainly with carbon dangling bonds as suitable trapping sites for hydrogen storage. The formation process of the nanostructures during milling under hydrogen atmosphere is also discussed on the basis of the profile of Raman spectroscopy.

Original languageEnglish
Pages (from-to)1545-1549
Number of pages5
JournalJournal of Applied Physics
Volume90
Issue number3
DOIs
Publication statusPublished - 2001 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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