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N, P, S co-doped hollow carbon polyhedron derived from MOFs-based core-shell nanocomposites for capacitive deionization

Abstract

Capacitive deionization (CDI) is a prospective technique for desalination of saline water on account of its lower cost, lower energy-consumption, and no secondary pollution. In this work, capacitive deionization of saline water using N, P, S co-doped hollow carbon polyhedron derived from MOFs-based core-shell nanocomposites has been demonstrated. N, P, S co-doped hollow carbon polyhedrons were rationally designed and originally synthesized from MOFs-based core-shell nanocomposites by using poly (cyclotriphosphazene-co-4, 4’ sulfonyldiphenol) coated zeolitic imidazolate framework-8 (donates as ZIF-8@PZS-C). Choosing poly (cyclotriphosphazene-co-4,4’-sulfonyldiphenol) as N, P, S co-doping sources and carbon sources, and ZIF-8 as structural templates which also acts as additional N-doping sources, ZIF-8@PZS-C were created with a superior hollow structure, high surface area, improved electrical conductivity and excellent hydrophilic surface. Due to the multi-synergy of these characteristics, the ZIF-8@PZS-C electrodes have lower internal impedance, larger specific capacitance and great cycling stability. What's more, the ZIF-8@PZS-C electrodes display the high salt electrosorption performance of 22.19 mg g−1 at 1.2 V in a NaCl solution of 500 mg L−1. Furthermore, the as-prepared electrodes exhibit good stability and regeneration performance. Hence, the N, P, S co-doped hollow carbon polyhedrons should be considered as a promising alternative electrode material for capacitive deionization. This work may open a door for the application of multi-heteroatom co-doped hollow carbon materials for the deionization of saline water.

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Publication details

The article was received on 23 May 2018, accepted on 11 Jul 2018 and first published on 12 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA04813D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    N, P, S co-doped hollow carbon polyhedron derived from MOFs-based core-shell nanocomposites for capacitive deionization

    J. Zhang, J. Fang, J. Han, T. Yan, L. Shi and D. Zhang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA04813D

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