X-ray Spectroscopically Probing Mo_(2)C@MoSe_(2)Heterojunction Electrodes  

利用X射线光谱探测Mo_(2)C@MoSe_(2)异质结电极

作　　者：CAO Yu-yang WEI Shi-qiang JIANG Wei Peter Joseph Chimtali YAN Zi-wei ZHOU Quan CHEN Shuang-ming SONG Li 曹宇杨;魏世强;蒋伟;Peter Joseph Chimtali;闫紫薇;周权;陈双明;宋礼(中国科学技术大学国家同步辐射实验室,安徽合肥230029;浙江光电子研究院,浙江金华321004)

机构地区：[1]National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China [2]Zhejiang Institute of Photonelectronics,Jinhua 321004,China

出　　处：《分析测试学报》2024年第10期1618-1625,共8页Journal of Instrumental Analysis

基　　金：National Key Research and Development Program of China(2020YFA0405800);National Natural Science Foundation of China(12322515,U23A20121,12225508);Youth Innovation Promotion Association of CAS(2022457);National Postdoctoral Program for Innovative Talents(BX20230346);China Postdoctoral Science Foundation(2023M743365)。

摘　　要：Due to their high electrical conductivity and layered structure,two dimensional MXene materials are re⁃garded as promising candidates for energy storage applications.However,the relatively low stability and specific ca⁃pacity of MXene materials limit their further utilization.In this study,these issues are addressed using a heterostruc⁃ture strategy via a one-step selenization method to form Mo_(2)C@MoSe_(2).Synchrotron radiation X-ray spectroscopic and high-resolution transmission electron microscopy(HRTEM)characterizations revealed the heterostructure consisting of in-situ grown MoSe_(2)on Mo_(2)C MXene.Electrochemical tests proved the heterojunction electrode’s superior rate perfor⁃mance of 289.06 mAh·g^(-1)at a high current density of 5 A·g^(-1)and long cycling stability of 550 mAh·g^(-1)after 900 cycles at 1 A·g^(-1).This work highlights the useful X-ray spectroscopic analysis to directly elucidate the heterojunction structure,providing an effective reference method for probing heterostructures.由于具有高导电性和层状结构,二维MXene材料被认为是用于储能应用的有前景的候选材料。然而,MXene材料相对较低的稳定性和比容量限制了其进一步利用。该文通过一步硒化方法形成Mo_(2)C@MoSe_(2)异质结构来解决上述问题。同步辐射X射线光谱和高分辨透射电子显微镜(HRTEM)表征揭示了由原位生长在Mo_(2)C MXene上的MoSe_(2)组成的异质结构。电化学测试证明了异质结电极在5 A·g^(-1)的高电流密度下具有289.06m Ah·g^(-1)的优异倍率性能,并在1 A·g^(-1)下经过900次循环后具有550 m Ah·g^(-1)的长循环稳定性。该研究采用X射线光谱分析直接阐明异质结构,为探测异质结构提供了一种有效的参考方法。

关 键 词：X-ray spectroscopic MXene HETEROJUNCTION X-ray absorption fine structure lithium-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]