Time‐Dependent Cation Selectivity of Titanium Carbide MXene in Aqueous Solution
- INM – Leibniz Institute for New Materials D2 2 66123 Saarbrücken Germany, Department of Materials Science and Engineering Saarland University Campus D2 2 66123 Saarbrücken Germany
- Department of Physics and Engineering Physics Tulane University New Orleans LA 70118 USA
- INM – Leibniz Institute for New Materials D2 2 66123 Saarbrücken Germany, Institute of Nanotechnology Karlsruhe Institute of Technology Hermann‐von‐Helmholtz‐Platz 1 76344 Eggenstein‐Leopoldshafen Germany
- Institute of Nanotechnology Karlsruhe Institute of Technology Hermann‐von‐Helmholtz‐Platz 1 76344 Eggenstein‐Leopoldshafen Germany
- State Key Laboratory of Coal Combustion School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 China, Nano Interface Centre for Energy School of Energy and Power Engineering HUST Wuhan Hubei 430074 China
- INM – Leibniz Institute for New Materials D2 2 66123 Saarbrücken Germany, Department of Materials Science and Engineering Saarland University Campus D2 2 66123 Saarbrücken Germany, Saarene Saarland Center for Energy Materials and Sustainability Campus C4 2 66123 Saarbrücken Germany
Electrochemical ion separation is a promising technology to recover valuable ionic species from water. Pseudocapacitive materials, especially 2D materials, are up‐and‐coming electrodes for electrochemical ion separation. For implementation, it is essential to understand the interplay of the intrinsic preference of a specific ion (by charge/size), kinetic ion preference (by mobility), and crystal structure changes. Ti 3 C 2 T z MXene is chosen here to investigate its selective behavior toward alkali and alkaline earth cations. Utilizing an online inductively coupled plasma system, it is found that Ti 3 C 2 T z shows a time‐dependent selectivity feature. In the early stage of charging (up to about 50 min), K + is preferred, while ultimately Ca 2+ and Mg 2+ uptake dominate; this unique phenomenon is related to dehydration energy barriers and the ion exchange effect between divalent and monovalent cations. Given the wide variety of MXenes, this work opens the door to a new avenue where selective ion‐separation with MXene can be further engineered and optimized.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI ID:
- 1841027
- Alternate ID(s):
- OSTI ID: 1842348
OSTI ID: 1981364
- Journal Information:
- Advanced Sustainable Systems, Journal Name: Advanced Sustainable Systems Journal Issue: 3 Vol. 6; ISSN 2366-7486
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English