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Novel hybrid capacitive deionization constructed by redox-active covalent organic framework and its derived porous carbon for highly efficient desalination

Abstract

Capacitive deionization (CDI) is a prospective cost-efficient technology for ion removal from brackish water. Development and design of new electrode materials with reasonable structure is of special importance for high performance CDI. Herein, redox-active covalent organic framework (COF) was first introduced and demonstrated as a novel faradaic cathode material for hybrid CDI (HCDI) application. Due to the high specific surface area and orderly distribution of redox unit, the COF presents a high capacitance of 170.9 F g-1 and typical pseudocapacitive characteristic. Moreover, N-doped porous carbon with high surface area and interconnected nanopores was synthesized from the same COF and used as anode in HCDI. The HCDI system demonstrates a highest salt removal capacity of 22.8 mg g-1 along with a maximum desalination rate of 3.2 mg g-1 s-1 in 500 ppm NaCl solution. The strategy in this work should provide a new insight in exploring high performance electrode materials for desalination application.

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Publication details

The article was received on 08 Jul 2019, accepted on 09 Oct 2019 and first published on 11 Oct 2019


Article type: Paper
DOI: 10.1039/C9TA07344B
J. Mater. Chem. A, 2019, Accepted Manuscript

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    Novel hybrid capacitive deionization constructed by redox-active covalent organic framework and its derived porous carbon for highly efficient desalination

    Y. Li, Z. Ding, X. Zhang, J. Li, X. Liu, T. Lu, Y. Yao and L. Pan, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA07344B

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