Boosting Transport Kinetics of Ions and Electrons Simultaneously by Ti3C2Tx(MXene)Addition for Enhanced Electrochromic Performance

作     者：Wenting Wu Huajing Fang Hailong Ma Liangliang Wu Wenqing Zhang Hong Wang Wenting Wu;Huajing Fang;Hailong Ma;Liangliang Wu;Wenqing Zhang;Hong Wang

作者机构：State Key Laboratory for Mechanical Behavior of MaterialsSchool of Material Science and EngineeringXi’an Jiaotong UniversityXi’an 710049People’s Republic of China School of Electronic and Information Engineering and State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049People’s Republic of China Department of PhysicsSouthern University of Science and TechnologyShenzhen 518055People’s Republic of China Department of Materials Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055People’s Republic of China Shenzhen Engineering Research Center for Novel Electronic Information Materials and DevicesSouthern University of Science and TechnologyShenzhen 518055People’s Republic of China 

出 版 物：《Nano-Micro Letters》 (纳微快报（英文版）)

年 卷 期：2021年第13卷第1期

页      面：381-393页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：the National Science Foundation of China(Nos.61631166004 and 51902250) the Fundamental Research Funds for the Central Universities(xzy012019002) H.F.thanks the support from Natural Science Basic Research Plan in Shaanxi Province of China(No.2020JQ-035) H.W.acknowledged the support of Shenzhen Science and Technology Program(No.KQTD20180411143514543) Shenzhen DRC project1433. 

主　　题：Electrochromic Mxene Transport kinetics Ionic conductivity Tungsten oxide 

摘      要：Electrochromic technology plays a significant role in energy conservation,while its performance is greatly limited by the transport behavior of ions and electrons.Hence,an electrochromic system with overall excellent performances still need to be explored.Initially motivated by the high ionic and electronic conductivity of transition metal carbide or nitride(MXene),we design a feasible procedure to synthesize the MXene/WO3−x composite electrochromic film.The consequently boosted electrochromic performances prove that the addition of MXene is an effective strategy for simultaneously enhancing electrons and ions transport behavior in electrochromic layer.The MXene/WO3−x electrochromic device exhibits enhanced transmittance modulation and coloration efficiency(60.4%,69.1 cm^2 C^−1),higher diffusion coefficient of Li+and excellent cycling stability(200 cycles)over the pure WO3−x device.Meanwhile,numerical stimulation theoretically explores the mechanism and kinetics of the lithium ion diffusion,and proves the spatial and time distributions of higher Li+concentration in MXene/WO3−x composite electrochromic layer.Both experiments and theoretical data reveal that the addition of MXene is effective to promote the transport kinetics of ions and electrons simultaneously and thus realizing a high-performance electrochromic device.This work opens new avenues for electrochromic materials design and deepens the study of kinetics mechanism of ion diffusion in electrochromic devices.