Influence of metal ions intercalation on the vibrational dynamics of water confined between MXene layers
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
- Pennsylvania State Univ., University Park, PA (United States). Dept of Mechanical and Nuclear Engineering
- Pennsylvania State Univ., University Park, PA (United States). Dept of Engineering Science and Mechanics
- Drexel Univ., Philadelphia, PA (United States). Dept. of Materials Science and Engineering, and A. J. Drexel Nanomaterials Institute
Two-dimensional carbides and nitrides of early transition metals (MXenes) combine high conductivity with hydrophilic surfaces, which make them promising for energy storage, electrocatalysis, and water desalination. Effects of intercalated metal ions on the vibrational states of water confined in Ti3C2Tx MXenes have been explored using inelastic neutron scattering (INS) and molecular dynamics simulations to better understand the mechanisms that control MXenes’ behavior in aqueous electrolytes, water purification and other important applications. Here, we observe INS signal from water in all samples, pristine and with lithium, sodium or potassium ions intercalated between the 2D Ti3C2Tx layers. However, only a small amount of water is found to reside in Ti3C2Tx intercalated with metal ions. Water in pristine Ti3C2Tx is more disordered, with bulk-like characteristics, in contrast to intercalated Ti3C2Tx, where water is more ordered, irrespective of the metal ions used for intercalation. The ordering of the confined water increases with the ion size. Lastly, this finding is further confirmed from molecular dynamics simulation which showed an increase in interference of water molecules with increasing ion size resulting in a concomitant decrease in water mobility, therefore, providing a guidance to tailor MXene properties for energy and environmental applications.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1414704
- Alternate ID(s):
- OSTI ID: 1409712
- Journal Information:
- Physical Review Materials, Vol. 1, Issue 6; ISSN 2475-9953
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Pristine Titanium Carbide MXene Films with Environmentally Stable Conductivity and Superior Mechanical Strength
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journal | November 2019 |
Negative dielectric constant of water confined in nanosheets
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journal | February 2019 |
Effect of mixed surface terminations on the structural and electrochemical properties of two-dimensional Ti 3 C 2 T 2 and V 2 CT 2 MXenes multilayers
|
journal | January 2018 |
Effect of mixed surface terminations on the structural and electrochemical properties of two-dimensional Ti3C2T2 and V2CT2 MXenes multilayers | text | January 2018 |
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