期刊
CARBON
卷 200, 期 -, 页码 430-436出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2022.08.036
关键词
Hydrogen isotope separation; Transition state; Zero -point energies; Single graphene membrane
资金
- National Natural Science Foundation of China [TD12-5004]
- Innovative Research Team of Tianjin Municipal Education Commission, China
The high selectivity of protons over deuterons in one-atom-thick graphene membranes has been experimentally demonstrated, but the underlying mechanism remains controversial. In this study, it is found that proton penetration through perfect graphene is nearly impermeable, while the lowest barrier is observed for lateral ring chemically bonded protons adjacent to hydrogenated hexacyclohydrides. The penetration process involves slip of chemically bonded protons into C-C to form C-H-C bridge bonds, followed by flipping over the graphene membrane.
High selectivity of protons over deuterons transport through one-atom-thick graphene membrane has been demonstrated experimentally, but its fundamental mechanism has been controversially discussed. Proposed hypotheses involve local hydrogenation, but the detailed penetration process has not been rigorously explained. In the present study, based on electron cloud density, transition path selection and corresponding barrier cal-culations, perfect graphene is quasi-impermeable to protons, yet lateral ring chemically bonded protons adjacent hydrogenated hexa-cyclohydride shows the lowest barrier for the penetration of proton. The bridge-flip as a link provides the site for the penetration of the proton through the graphene. The chemically bonded protons slip into C-C to forms a C-H-C bridge bonds, and then flip over the graphene membrane to complete the penetration process.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据