异价离子取代构建高离子电导率的插层结构  

Building intercalation structure for high ionic conductivity via aliovalent substitution

作　　者：孙宗栋 梁嘉宁 刘开朗 冯昕 吴宇 赵英鹤 梁麒 吴劲松 李会巧 翟天佑 Zongdong Sun;Jianing Liang;Kailang Liu;Xin Feng;Yu Wu;Yinghe Zhao;Qi Liang;Jinsong Wu;Huiqiao Li;Tianyou Zhai(State Key Laboratory of Materials Processing and Die&Mould Technology,and School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Nanostructure Research Center,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]State Key Laboratory of Materials Processing and Die&Mould Technology,and School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Nanostructure Research Center,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Science Bulletin》2023年第11期1134-1142,M0004,共10页科学通报（英文版）

基　　金：supported by the National Key Research and Development Program of China(2021YFB3800300 and 2018YFE0206900);the National Natural Science Foundation of China(21825103,U21A2069,and 52072138)。

摘　　要：在纳米尺度通道内的离子传输是纳米流体学领域研究的重点.二维(2D)材料的本征层状结构为流体离子提供了稳健的纳米传输通道.为实现流体离子在2D材料薄膜内的高效传输,本文开发了一种新颖的异价离子取代插层策略,通过化学气相输运法直接合成多种具有高离子电导结构的单晶.将块体单晶置入水中通过手动摇晃即可获得二维纳米片分散液,组装后的薄膜展现出高的锂离子电导率,优于目前多数关于2D材料薄膜水相锂离子电导率的报道.这种在合成过程中直接构筑离子传输结构的策略与目前已有的先剥离2D材料后对纳米片修饰改性的方法完全不同.因此,这种普适性的异价离子取代插层策略将会为更多高离子电导率的2D材料薄膜的开发提供借鉴与参考.Two-dimensional(2D)materials,which possess robust nanochannels,high flux and allow scalable fabrication,provide new platforms for nanofluids.Highly efficient ionic conductivity can facilitate the application of nanofluidic devices for modern energy conversion and ionic sieving.Herein,we propose a novel strategy of building an intercalation crystal structure with negative surface charge and mobile interlamellar ions via aliovalent substitution to boost ionic conductivity.The Li_(2x)M_(1–x)PS_(3)(M=Cd,Ni,Fe)crystals obtained by the solid-state reaction exhibit distinct capability of water absorption and apparant variation of interlayer spacing(from 0.67 to 1.20 nm).The assembled membranes show the ultrahigh ionic conductivity of 1.20 S/cm for Li_(0.5)Cd_(0.75)PS_(3)and 1.01 S/cm for Li0.6Ni0.7PS3.This facile strategy may inspire the research in other 2D materials with higher ionic transport performance for nanofluids.

关 键 词：离子电导率 离子取代 纳米片 离子传输 纳米流体 材料薄膜 传输通道 插层结构 

分 类 号：TB383.2[一般工业技术—材料科学与工程]