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

被引:86
作者
Chung, T. C. Mike [1 ]
Jeong, Youmi [1 ]
Chen, Qiang [2 ]
Kleinhammes, Alked [2 ]
Wu, Yue [2 ]
机构
[1] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
[2] Univ N Carolina, Dept Phys, Chapel Hill, NC 27599 USA
关键词
D O I
10.1021/ja800071y
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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 m(2)/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 similar to 11 kJ/mol, significantly higher than the 4 kJ/mol reported on most graphitic surfaces.
引用
收藏
页码:6668 / +
页数:3
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