The synthesis and characterization of a super-activated carbon containing substitutional boron (BCx) and its applications in hydrogen storage

Youmi Jeong, Tze-chiang Chung

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

A new family of porous boron-substituted carbon (BCx) materials with controlled structure is investigated. The chemistry involves a B-precursor polymer, i.e., poly(borachlorophenyldiacetylene), containing inorganic additives (templates). At pyrolysis <400 °C, the B-precursor engages in easy inter-chain reactions to form dark solid with high yield (>85%). Above 600 °C, the amorphous carbon-like BCx materials containing up to 12% B have been prepared, which show an extended fused hexagonal ring structure with B-puckered curvature. This out of planar B moiety maintains its electron deficiency, due to limited π-electron delocalization, and exhibits super-activated properties to enhance H2 binding energy (20-10 kJ/mol) and adsorption capacity. After removing the inorganic additives by water-washing, the resulting porous BCx shows a surface area 500-800 m2/g. Evidently, the pore size distribution is directly related to melting temperature and distribution of the inorganic salts. As the temperature increases to >1400 °C, the distorted ring structure gradually flatten out to form a multi-layer (crystalline) BCx structure. The resulting planar graphitic layer only can accommodate a reduced B content (<3% at 1800 °C) and low surface area. The B moieties also lose their acidity due to the extensive π-electron delocalization.

Original languageEnglish (US)
Pages (from-to)2526-2537
Number of pages12
JournalCarbon
Volume48
Issue number9
DOIs
StatePublished - Aug 1 2010

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Boron
Hydrogen storage
Activated carbon
Electrons
Amorphous carbon
Binding energy
Washing
Acidity
Pore size
Melting point
Polymers
Pyrolysis
Carbon
Salts
Crystalline materials
Adsorption
Water
Temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

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title = "The synthesis and characterization of a super-activated carbon containing substitutional boron (BCx) and its applications in hydrogen storage",
abstract = "A new family of porous boron-substituted carbon (BCx) materials with controlled structure is investigated. The chemistry involves a B-precursor polymer, i.e., poly(borachlorophenyldiacetylene), containing inorganic additives (templates). At pyrolysis <400 °C, the B-precursor engages in easy inter-chain reactions to form dark solid with high yield (>85{\%}). Above 600 °C, the amorphous carbon-like BCx materials containing up to 12{\%} B have been prepared, which show an extended fused hexagonal ring structure with B-puckered curvature. This out of planar B moiety maintains its electron deficiency, due to limited π-electron delocalization, and exhibits super-activated properties to enhance H2 binding energy (20-10 kJ/mol) and adsorption capacity. After removing the inorganic additives by water-washing, the resulting porous BCx shows a surface area 500-800 m2/g. Evidently, the pore size distribution is directly related to melting temperature and distribution of the inorganic salts. As the temperature increases to >1400 °C, the distorted ring structure gradually flatten out to form a multi-layer (crystalline) BCx structure. The resulting planar graphitic layer only can accommodate a reduced B content (<3{\%} at 1800 °C) and low surface area. The B moieties also lose their acidity due to the extensive π-electron delocalization.",
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The synthesis and characterization of a super-activated carbon containing substitutional boron (BCx) and its applications in hydrogen storage. / Jeong, Youmi; Chung, Tze-chiang.

In: Carbon, Vol. 48, No. 9, 01.08.2010, p. 2526-2537.

Research output: Contribution to journalArticle

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