1D/2D composite subnanometer channels for ion transport:The role of confined water
作者机构：Institute of Molecular PlusDepartment of ChemistryTianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical TransformationsTianjin 300192China Ministry of Education Key Laboratory for the Green Preparation and Application of Functional MaterialsHubei Key Laboratory of Polymer MaterialsHubei UniversityWuhan 430062China School of Chemical Engineering and Analytical ScienceNational Graphene InstituteUniversity of ManchesterManchesterM139PLUK School of Civil EngineeringTianjin UniversityTianjin 300072China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2023年第16卷第8期
页 面：10913-10921页
核心收录：
学科分类：07[理学] 070205[理学-凝聚态物理] 0703[理学-化学] 0702[理学-物理学]
基 金：This work is financially supported by the National Key Research and Development Program(No.2021YFB3802500) National Natural Science Foundation of China(Nos.21972105 and 22278302) Haihe Laboratory of Sustainable Chemical Transformations,and 1000-Talent Program for Young Scientists.
主 题：ion transport subnanometer channels confined water aqueous electrolyte limited side reactions
摘 要：As a mass transport media,water is an alternative of organic solvent applied in rechargeable batteries,due to its unique properties,including fast ionic migration,easy-processibility,economic/environmental friendliness,and flame retardancy.However,due to the high activity of water molecules in aqueous electrolytes,the corrosion of metal anode,side reactions,and inferior metal electrodeposition behavior leads to unstable cycling performance,poor Coulombic efficiency(CE),and early-staged failure of batteries.Despite several attempts to regulate the activity of water,migration of ions is sacrificed,due to the limited methods to control the water states.Herein,we developed a subnanoscale confinement strategy based on a nacre-like structure to modulate the activity of water in the solid electrolytes.By tuning the ratio between the two-dimensional(2D)vermiculite and one-dimensional(1D)cellulose nanofibers(CNFs),the capillary size in the 1D/2D structure is altered to achieve a fast Zn^(2+)transport.Our dielectric relaxation and molecular dynamics studies indicate that the enhanced Zn^(2+)conductivity is attributed to the fast water relaxation in the precisely defined 1D/2D capillary.Taking advantage of the regulated activity of the confined water in 2D capillary,the composite vermiculite membrane can suppress the corrosion and side reactions between Zn electrode and water molecular,endowing a reversible Zn^(2+)stripping/plating behavior and a stable cycling performance for 900 h.Based on our confinement strategy to control the water states by 1D/2D structures,this work will open an avenue toward aqueous energy storage devices with excellent reversibility,high safety,and long-term stability.
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