期刊
APPLIED SURFACE SCIENCE
卷 416, 期 -, 页码 781-789出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.04.239
关键词
2D materials; Fluoride salts; Etching; Methane; Adsorption; Surface
类别
资金
- National Nature Science Foundation of China [51472075, 51205111]
- Program for Innovative Research Team (in Science and Technology) in the University of Henan Province [16IRTSTHN005]
- Plan for Scientific Innovation Talent of Henan Province [134100510008]
- Program for Innovative Research Team of Henan Polytechnic University [T2013-4]
- Fundamental Research Funds for the Universities of Henan Province [NSFRF140401, 140601]
Here we reported the preparation of Ti3C2 MXene and Ti2C MXene by etching Ti3AlC2 and Ti2AlC with various fluoride salts in hydrochloric acid (HCl), including lithium fluoride (LiF), sodium fluoride (NaF), potassium fluoride (KF), and ammonium fluoride (NH4F). As-prepared Ti2C was further delaminated by urea, dimethylsulfoxide or ammonium hydroxide. Based on theoretical calculation and XPS results, the type of positive ions (Li+, Na+, K+, or NH4(+)) in etchant solution affect the surface structure of prepared MXene, which, in turn, affects the methane adsorption properties of MXene. The highest methane adsorption capacity is 8.5 cm3/g for Ti3C2 and 11.6 cm(3)/g for Ti2C. MXenes made from LiF and NH4F can absorb methane under high pressure and can keep methane under normal pressure, these MXenes may have important application on capturing methane or other hazardous gas molecules. MXenes made from NaF and KF can absorb methane under high pressure and release methane under low pressure. They can have important application in the adsorb storage of nature gas. (C) 2017 Elsevier B.V. All rights reserved.
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