TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Wang, Lei
A1  - Torkamanzadeh, Mohammad
A1  - Majed, Ahmad
A1  - Zhang, Yuan
A1  - Wang, Qingsong
A1  - Breitung, Ben
A1  - Feng, Guang
A1  - Naguib, Michael
A1  - Presser, Volker
T1  - Time-Dependent Cation Selectivity of Titanium Carbide MXene in Aqueous Solution
JF  - Advanced Sustainable Systems
N2  - 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.
KW  - electrochemistry
KW  - ion selectivity
KW  - ion-exchange
KW  - MXenes
Y1  - 2022
UN  - https://nbn-resolving.org/urn:nbn:de:bsz:291:415-509
SN  - 2366-7486
SS  - 2366-7486
U6  - https://doi.org/10.1002/adsu.202100383
DO  - https://doi.org/10.1002/adsu.202100383
VL  - 6
IS  - 3
SP  - 2100383
ER  -