Journal
MATERIALS HORIZONS
Volume 9, Issue 6, Pages 1708-1716Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1mh01882e
Keywords
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Funding
- National Natural Science Foundation of China [51909066]
- Scientific Research Foundation for the Returned Scholars of Hebei Province [C20200335]
- National Natural Science Foundation of Hebei Province [C2020204136]
- JST-ERATO Yamauchi Materials Space-Tectonics Project [JPMJER2003]
- JSPS Postdoctoral Fellowship for Overseas Researchers
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This study reports a covalent organic framework (COF)-on-MXene heterostructure with heterointerface optimization for high-performance capacitive deionization (CDI) of natural (oxygenated) saline water. The heterostructure inherits the excellent properties of MXene and COF, exhibiting stable cycling performance and high salt adsorption capacity.
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.
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