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arXiv 0903.3079cond-mat.mtrl-sci
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电场增强BN片储氢性能研究

Electric Field Enhanced Hydrogen Storage on BN Sheet

J. Zhou, Q. Wang, Q. Sun, P. Jena, X. S. Chen

摘要:

使用密度泛函理论,我们表明,施加的电场通过极化氢分子以及基板,大大提高了BN片的储氢性能。在0.05 a. u.的电场存在下单个H2分子的吸附能。是0.48 eV,而在其不存在时为0.07 eV。当吸附一层H2分子时,每个H2分子的结合能从无场情况下的0.03 eV增加到存在0.045 a. u的电场时的0.14 eV/H2。7.5wt%的相应重量密度与DOE为2010年设定的6wt%系统目标一致。一旦去除所施加的电场,存储的H2分子可以容易地释放,从而使存储可逆。

英文摘要:

Using density functional theory we show that an applied electric field substantially improves the hydrogen storage properties of a BN sheet by polarizing the hydrogen molecules as well as the substrate. The adsorption energy of a single H2 molecule in the presence of an electric field of 0.05 a.u. is 0.48 eV compared to 0.07 eV in its absence. When one layer of H2 molecules is adsorbed, the binding energy per H2 molecule increases from 0.03 eV in the field-free case to 0.14 eV/H2 in the presence of an electric field of 0.045 a.u. The corresponding gravimetric density of 7.5 wt % is consistent with the 6 wt % system target set by DOE for 2010. Once the applied electric field is removed, the stored H2 molecules can be easily released, thus making the storage reversible.

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。

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