Locally Enhanced Flow and Electric Fields Through a Tip Effect for Efficient Flow‑Electrode Capacitive DeionizationOA
Low-electrode capacitive deionization(FCDI)is an emerging desalination technology with great potential for removal and/or recycling ions from a range of waters.However,it still suffers from inefficient charge transfer and ion transport kinetics due to weak turbulence and low electric intensity in flow electrodes,both restricted by the current collectors.Herein,a new tip-array current collector(designated as T-CC)was developed to replace the conventional planar current collectors,which intensifies both the charge transfer and ion transport significantly.The effects of tip arrays on flow and electric fields were studied by both computational simulations and electrochemical impedance spectroscopy,which revealed the reduction of ion transport barrier,charge transport barrier and internal resistance.With the voltage increased from 1.0 to 1.5 and 2.0 V,the T-CC-based FCDI system(T-FCDI)exhibited average salt removal rates(ASRR)of 0.18,0.50,and 0.89μmol cm^(-2) min^(-1),respectively,which are 1.82,2.65,and 2.48 folds higher than that of the conventional serpentine current collectors,and 1.48,1.67,and 1.49 folds higher than that of the planar current collectors.Meanwhile,with the solid content in flow electrodes increased from 1 to 5 wt%,the ASRR for T-FCDI increased from 0.29 to 0.50μmol cm^(-2) min^(-1),which are 1.70 and 1.67 folds higher than that of the planar current collectors.Additionally,a salt removal efficiency of 99.89%was achieved with T-FCDI and the charge efficiency remained above 95%after 24 h of operation,thus showing its superior long-term stability.
Ziquan Wang;Xiangfeng Chen;Yuan Zhang;Jie Ma;Zhiqun Lin;Amor Abdelkader;Maria‑Magdalena Titirici;Libo Deng
College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518060,People’s Republic of ChinaCollege of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518060,People’s Republic of ChinaCollege of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518060,People’s Republic of ChinaResearch Center for Environmental Functional Materials,College of Environmental Science and Engineering,Tongji University,1239 Siping Road,Shanghai 200092,People’s Republic of ChinaDepartment of Chemical and Biomolecular Engineering,National University of Singapore,Singapore 117585,SingaporeDepartment of Engineering,Faculty of Science and Technology,Bournemouth University,Talbot Campus,Fern Barrow,Poole,England BH125BB,UK Institut de Chimie de Nice,UniversitéCôte d’Azur,UMR CNRS 7272,28 Av.Valrose,06108 Nice,FranceDepartment of Chemical Engineering,Imperial College London,South Kensington Campus,Exhibition Rd,London SW72AZ,UKCollege of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518060,People’s Republic of China
海洋学
Flow-electrodeCapacitive deionizationCurrent collectorTip effectDesalination
《Nano-Micro Letters》 2025 (2)
P.1-17,17
supported by the Shenzhen Science and Technology Program(JCYJ20230808105111022,JCYJ20220818095806013)Natural Science Foundation of Guangdong(2023A1515012267)the National Natural Science Foundation of China(22178223)the Royal Society/NSFC cost share program(IEC\NSFC\223372).
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