On the possibility of hydrogen intercalation of graphite-like carbon materials - Electrochemical and molecular orbital studies

Mikio Watanabe, Masanori Tachikawa, Tetsuya Osaka

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Abstract

Graphite-like carbon materials were investigated to learn whether they form hydrogen-graphite intercalation compounds (H-GICs), which would be useful as hydrogen storage materials in rechargeable batteries. The ability of graphite-like materials to absorb hydrogen was examined with cyclic voltammetry (CV) and constant-current charge and discharge tests in 6 mol dm-3 KOH. It was concluded that H-GICs did not form under our experimental conditions. In order to understand the difference between hydrogen and lithium ions in ability to form the intercalation compounds with graphite-like carbon materials, molecular orbital analyses were carried out. The results demonstrate that lithium-graphite intercalation compounds (Li-GICs) are stable because of the presence of lithium 2p-orbitals, whereas such stable graphite intercalation compounds do not form with hydrogen ions because no three-dimensional p-orbitals are available.

Original languageEnglish
Pages (from-to)2707-2717
Number of pages11
JournalElectrochimica Acta
Volume42
Issue number17
DOIs
Publication statusPublished - 1997 Jan 1

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Keywords

  • Graphite intercalation compounds
  • Hydrogen
  • Lithium
  • Molecular orbital methods

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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