arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0901.2598cond-mat.mtrl-sci
收藏

钙修饰碳纳米管的高容量储氢研究

Calcium-Decorated Carbon Nanotubes for High-Capacity Hydrogen Storage

Hoonkyung Lee, Jisoon Ihm, Marvin L. Cohen, Steven G. Louie

摘要:

使用第一性原理计算,我们进行了一个搜索的基础上,掺杂或有缺陷的碳纳米管上的单独分散的钙原子的高容量储氢介质。我们发现,多达六个H2分子可以结合到一个Ca原子,每个具有理想的结合能约0.2 eV/H2。空Ca 3d态与H2 σ态的杂化有助于H2结合,并且Ca原子优先结合到掺杂的硼和分散在碳纳米管上的缺陷位点来抑制Ca簇集。我们还表明,个别钙修饰的B掺杂的碳纳米管的浓度为~6原子。%的B掺杂可以达到~ 5wt%氢的重量容量。

英文摘要:

Using first-principles calculations, we perform a search for high-capacity hydrogen storage media based on individually dispersed calcium atoms on doped or defective carbon nanotubes. We find that up to six H2 molecules can bind to a Ca atom each with a desirable binding energy of ~0.2 eV/H2. The hybridization of the empty Ca 3d states with the H2 sigma states contributes to the H2 binding, and Ca clustering is suppressed by preferential binding of Ca atoms to doped boron and defect sites dispersed on carbon nanotubes. We also show that individual Ca-decorated B-doped CNTs with a concentration of ~6 at. % B doping can reach the gravimetric capacity of ~5 wt % hydrogen.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑