期刊
NANO LETTERS
卷 16, 期 4, 页码 2240-2247出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b04514
关键词
Phosphorene; ionic transport; edge effect; rechargeable ion battery; in situ electron microscopy
类别
资金
- National Science Foundation [CMMI-1619743]
- National Natural Science Foundation of China [11504169, 61575094]
- MRI-R2 grant from the National Science Foundation [DMR-0959470]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1619743] Funding Source: National Science Foundation
Despite many theoretical predictions indicating exceptionally low energy barriers of ionic transport in phosphorene, the ionic transport pathways in this two-dimensional (2D) material has not been experimentally demonstrated. Here, using in situ aberration-corrected transmission electron microscopy (TEM) and density functional theory, we studied sodium ion transport in phosphorene. Our high-resolution TEM imaging complemented by electron energy loss spectroscopy demonstrates a precise description of anisotropic sodium ions migration along the [100] direction in phosphorene. This work also provides new insight into the effect of surface and the edge sites on the transport properties of phosphorene. According to our observation, the sodium ion transport is preferred in zigzag edge rather than the armchair edge. The use of this highly selective ionic transport property may endow phosphorene with new functionalities for novel chemical device applications.
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