Reactive P and S co-doped porous hollow nanotube arrays for high performance chloride ion storage

Siyang Xing, Ningning Liu, Qiang Li, Mingxing Liang, Xinru Liu, Haijiao Xie, Fei Yu and Jie Ma ()
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Siyang Xing: College of Environmental Science and Engineering, Tongji University
Ningning Liu: College of Environmental Science and Engineering, Tongji University
Qiang Li: College of Environmental Science and Engineering, Tongji University
Mingxing Liang: College of Environmental Science and Engineering, Tongji University
Xinru Liu: College of Environmental Science and Engineering, Tongji University
Haijiao Xie: Xihu District
Fei Yu: Shanghai Ocean University, No 999, Huchenghuan Road
Jie Ma: College of Environmental Science and Engineering, Tongji University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Developing stable, high-performance chloride-ion storage electrodes is essential for energy storage and water purification application. Herein, a P, S co-doped porous hollow nanotube array, with a free ion diffusion pathway and highly active adsorption sites, on carbon felt electrodes (CoNiPS@CF) is reported. Due to the porous hollow nanotube structure and synergistic effect of P, S co-doped, the CoNiPS@CF based capacitive deionization (CDI) system exhibits high desalination capacity (76.1 mgCl– g–1), fast desalination rate (6.33 mgCl– g–1 min–1) and good cycling stability (capacity retention rate of > 90%), which compares favorably to the state-of-the-art electrodes. The porous hollow nanotube structure enables fast ion diffusion kinetics due to the swift ion transport inside the electrode and the presence of a large number of reactive sites. The introduction of S element also reduces the passivation layer on the surface of CoNiP and lowers the adsorption energy for Cl– capture, thereby improving the electrode conductivity and surface electrochemical activity, and further accelerating the adsorption kinetics. Our results offer a powerful strategy to improve the reactivity and stability of transition metal phosphides for chloride capture, and to improve the efficiency of electrochemical dechlorination technologies.

Date: 2024
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DOI: 10.1038/s41467-024-49319-5

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