Synthesis of microporous boron-substituted carbon (B/C) materials using polymeric precursors for hydrogen physisorption

Tze-chiang Chung, Youmi Jeong, Qiang Chen, Alfred Kleinhammes, Yue Wu

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85 Scopus citations

Abstract

This paper discusses a new synthesis route to prepare microporous boron substituted carbon (B/C) materials that show a significantly higher hydrogen binding energy and physisorption capacity, compared with the corresponding carbonaceous (C) materials. The chemistry involves a pyrolysis of the designed boron-containing polymeric precursors, which are the polyaddition and polycondensation adducts between BCl3 and phenylene diacetylene and lithiated phenylene diacetylene, respectively. During pyrolysis, most of the boron moieties were transformed into a B-substituted C structure, and the in situ formed LiCl byproduct created a microporous structure. The microporous B/C material with B content > 7% and surface area > 700 m2/g has been prepared, which shows a reversible hydrogen physisorption capacity of 0.6 and 3.2 wt % at 293 and 77 K, respectively, under 40 bar of hydrogen pressure. The physisorption results were further warranted by absorption isotherms indicating a binding energy of hydrogen molecules of ∼11 kJ/mol, significantly higher than the 4 kJ/mol reported on most graphitic surfaces.

Original languageEnglish (US)
Pages (from-to)6668-6669
Number of pages2
JournalJournal of the American Chemical Society
Volume130
Issue number21
DOIs
StatePublished - May 28 2008

All Science Journal Classification (ASJC) codes

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

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