Issue 6, 2022

Heterointerface optimization in a covalent organic framework-on-MXene for high-performance capacitive deionization of oxygenated saline water

Abstract

Capacitive deionization (CDI) provides a promising option for affordable freshwater while simultaneously storing energy, but its large-scale application is usually limited owing to the poor performance of conventional materials in natural (oxygenated) saline water. Herein, we report heterointerface optimization in a covalent organic framework (COF)-on-MXene heterostructure achieving a high CDI performance for desalination of oxygenated saline water. The 2D heterostructure with the optimal core–shell architecture inherits the high conductivity and reversible ion intercalation/deintercalation ability of MXene, and the hierarchical porous structure, large porosity, and extraordinary redox capacity of COFs. Thanks to the heterointerface optimization, the MXene@COF heterostructure exhibits a very stable cycling performance over 100 CDI cycles with a maximum NaCl adsorption capacity of 53.1 mg g−1 in oxygenated saline water, among the state-of-the-art values for CDI electrodes and also exceeding those of most MXene-based or 2D materials. This study highlights the importance of heterointerface optimization in MXene-organic 2D heterostructures to promote CDI of natural (oxygenated) saline water.

Graphical abstract: Heterointerface optimization in a covalent organic framework-on-MXene for high-performance capacitive deionization of oxygenated saline water

Supplementary files

Article information

Article type
Communication
Submitted
20 Nov 2021
Accepted
30 Mar 2022
First published
04 Apu 2022

Mater. Horiz., 2022,9, 1708-1716

Author version available

Heterointerface optimization in a covalent organic framework-on-MXene for high-performance capacitive deionization of oxygenated saline water

S. Zhang, X. Xu, X. Liu, Q. Yang, N. Shang, X. Zhao, X. Zang, C. Wang, Z. Wang, J. G. Shapter and Y. Yamauchi, Mater. Horiz., 2022, 9, 1708 DOI: 10.1039/D1MH01882E

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