Combined hydrogen production and storage with subsequent carbon crystallization

Angela D. Lueking, Humberto R. Gutierrez, Dania A. Fonseca, Deepa L. Narayanan, Dirk Van Essendelft, Puja Jain, Caroline E.B. Clifford

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

We provide evidence of low-temperature hydrogen evolution and possible hydrogen trapping in an anthracite coal derivative, formed via reactive ball milling with cyclohexene. No molecular hydrogen is added to the process. Raman-active molecular hydrogen vibrations are apparent in samples at atmospheric conditions (300 K, 1 bar) for samples prepared 1 year previously and stored in ambient air. Hydrogen evolves slowly at room temperature and is accelerated upon sample heating, with a first increase in hydrogen evolution occurring at approximately 60 °C. Subsequent chemical modification leads to the observation of crystalline carbons, including nanocrystalline diamond surrounded by graphene ribbons, other sp2-sp3 transition regions, purely graphitic regions, and a previously unidentified crystalline carbon form surrounded by amorphous carbon. The combined evidence for hydrogen trapping and carbon crystallization suggests hydrogen-induced crystallization of the amorphous carbon materials, as metastable hydrogenated carbons formed via the high-energy milling process rearrange into more thermodynamically stable carbon forms and molecular hydrogen.

Original languageEnglish (US)
Pages (from-to)7758-7760
Number of pages3
JournalJournal of the American Chemical Society
Volume128
Issue number24
DOIs
StatePublished - Jun 21 2006

All Science Journal Classification (ASJC) codes

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry

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