Synthesis of microporous boron-substituted carbon (BCx) materials for hydrogen physisorption

T. C. Chung, Youmi Jeong

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper discusses a new synthesis route to prepare boron substituted carbon (BCx) materials containing 3-15% B content and microporous microstructure. The BCx materials show a significantly higher hydrogen binding energy (10-20 kJ/mol)and physisorption capacity (2-3 times increase), compared with the corresponding carbonaceous (C) materials. Both enhancements are directly associated with B content and the acidity of B moiety. The chemistry involves a pyrolysis of the designed boron-containing polymeric precursors with the specific B contents. During pyrolysis, most of the boron moieties in the precursor were transformed into BCx material with the structure changing from puckered to graphitic controlled by pyrolysis temperature. On the other hand, the in situ formed by-products created a micro-porous structure. The micro-porous BCx 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 bars hydrogen pressure. The physisorption results were further warranted by absorption isotherms and in situ 1H NMR studies, indicating a high binding energy of hydrogen molecules.

Original languageEnglish (US)
Title of host publicationAmerican Chemical Society - 238th National Meeting and Exposition, ACS 2009, Abstracts of Scientific Papers
StatePublished - Dec 1 2009
Event238th National Meeting and Exposition of the American Chemical Society, ACS 2009 - Washington, DC, United States
Duration: Aug 16 2009Aug 20 2009

Publication series

NameACS National Meeting Book of Abstracts
ISSN (Print)0065-7727

Other

Other238th National Meeting and Exposition of the American Chemical Society, ACS 2009
CountryUnited States
CityWashington, DC
Period8/16/098/20/09

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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    Chung, T. C., & Jeong, Y. (2009). Synthesis of microporous boron-substituted carbon (BCx) materials for hydrogen physisorption. In American Chemical Society - 238th National Meeting and Exposition, ACS 2009, Abstracts of Scientific Papers (ACS National Meeting Book of Abstracts).