Enhanced hydrogen sorption on carbonaceous sorbents under electric field
Enhanced hydrogen sorption on carbonaceous sorbents under electric field
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DOI：
10.1016/j.ijhydene.2009.11.008
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发表时间：
2010
影响因子：
7.2
通讯作者：
Shangzhao Shi;Jiann-Yang Hwang;Xuan Li;Xiang Sun;B. Lee
中科院分区：
文献类型：
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作者：
Shangzhao Shi;Jiann-Yang Hwang;Xuan Li;Xiang Sun;B. Lee
研究了外加电场对碳质吸附剂物理吸附氢等温线的影响。通过施加2000 V的正电位到载铂碳样品，获得了独特的吸附增强。这一现象归因于氢气与吸附剂之间较强的相互作用。理论研究表明，氢与中性碳的相互作用主要是芳环上的π-键与H2上的σ-键之间的静电引力，属于货车范德华力，且作用较弱。然而，带电的碳和氢之间的相互作用可能涉及氢和碳之间的轨道相互作用，这种相互作用比货车范德华引力更强。实验研究表明，铂的存在会诱导氢分子解离成氢原子。更容易接近的原子轨道可能有利于电子从原子氢转移到带电的碳。
The effect of an applied electric field on hydrogen physisorption isotherm on carbonaceous sorbents was studied. Distinctive sorption enhancement was obtained by applying a positive electrical potential of 2000V to platinum-supported carbon samples. The phenomenon was ascribed to stronger interactions between hydrogen and the sorbent. Theoretical studies suggested that, the interaction between hydrogen and neutral carbon is primarily the electrostatic attraction between the π-bonds of the aromatic rings and the σ-bonds of H2, which is classified as van der Waals interaction and is weak. However, the interaction between electrically charged carbon and hydrogen might involve orbital interactions between hydrogen and carbon, an interaction stronger than van der Waals attraction. Experimental studies indicated that the presence of platinum would induce dissociation of hydrogen molecules in to hydrogen atoms. The easier accessibility of the atomic orbital might favor the electron transfer from the atomic hydrogen to charged carbon.