Combined hydrogen production and storage with subsequent carbon crystallization

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

Research output: Contribution to journalArticlepeer-review

32 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
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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