DataVXAdvanced Sustainable SystemsPaper
journal article·2022-03Open access

Time‐Dependent Cation Selectivity of Titanium Carbide MXene in Aqueous Solution

Lei Wang, Mohammad Torkamanzadeh, Ahmad Majed, Yuan Zhang, Qingsong Wang, Ben Breitung, Guang Feng, Michael Naguib, Volker Presser

Advanced Sustainable Systems· Volume 6· Issue 3
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Source abstract

Abstract

Abstract 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. Ti3C2Tz 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 Ti3C2Tz shows a time‐dependent selectivity feature. In the early stage of charging (up to about 50 min), K+ is preferred, while ultimately Ca2+ and Mg2+ 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.
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Research context

Nanomaterials

OpenAlex topics: MXene and MAX Phase Materials · Graphene research and applications · Supercapacitor Materials and Fabrication

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

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

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

Saarene Saarland Center for Energy Materials and Sustainability Campus C4 2 66123 Saarbrücken Germany

Funding

Deutsche Forschungsgemeinschaft · China Scholarship Council · U.S. Department of Energy · Office of Science · Basic Energy Sciences

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