Spray pyrolysis-derived W-doped MoSe_(2)/rGO paper-like microspheres:optimization of microstructure and mesostructure for enhanced lithium storage  

作　　者：Wei Wang Jun-Yu Chen Jie Ouyang Hong Yin Ao-Jie Li Liang Chen Jun-Lin Huang Yu-Can Zhu Gang-Yong Li Zhao-Hui Hou 

机构地区：[1]Key Laboratory of Hunan Province for Advanced Carbon-based Functional Materials,Hunan Institute of Science and Technology,Yueyang 414006,China [2]School of Chemistry and Chemical Engineering,Hunan Institute of Science and Technology,Yueyang414006,China [3]Hunan Province Key Laboratory of Materials Surface&Interface Science and Technology,Material Science and Engineering School,Central South University of Forestry and Technology,Changsha 410004,China [4]International Iberian Nanotechnology Laboratory(INL),Av,Mestre Jose Veiga,4715-330 Braga,Portuga

出　　处：《Rare Metals》2024年第7期3019-3031,共13页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52171207,52104301,52271211 and 52204311);the Natural Science Foundation of Hunan Province(Nos.2023JJ30280,2023JJ30277 and 2022JJ40162);the Science and Technology Innovation Program of Hunan Province(No.2022RC3037);the Science&Technology talents lifting project of Hunan Province(No.2022TJ-N16);the Scientific Research Fund of Hunan Provincial Education Department(Nos.21B0591 and 22A0474)。

摘　　要：Two-dimensional MoSe_(2) is a promising candidate for lithium-ion battery anodes.However,its conductivity and lithium storage volumetric effect still need to be optimized.In this work,W-doped MoSe_(2)/rGO paper-like microspheres are successfully prepared through ultrasonic spray pyrolysis,achieving optimization at both the microstructure and mesostructure to enhance the lithium storage performance of the material.Firstly,by utilizing the similar two-dimensional structure between MoSe_(2) and rGO,self-assembly is achieved through spray pyrolysis,resulting in a well-defined van der Waals heterostructure at the interface on the microscale,enhancing the electron and ion transfer capability of the composite.Secondly,the mesoscale paper-like microsphere morphology provides additional volume expansion buffering space.Moreover,W-doping not only increases the interlayer spacing of MoSe_(2)(0.73 nm),thereby reducing the diffusion resistance of Li+,but also allow for the modulation of the energy band structure of the material.Density functional theory(DFT)calculations confirm that W-doped MoSe_(2)/rGO exhibits the narrowest bandgap(0.892 eV).Therefore,the composite demonstrates excellent lithium storage performance,maintaining a specific capacity of 732.9 mAh·g^(-1)after 300 cycles at a current density of 1 A·g^(-1).

关 键 词：Molybdenum selenide HETEROSTRUCTURE MICROSPHERES Li-ion batteries Kinetics 

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]