Boosting K-ion kinetics by interfacial polarization induced by amorphous MoO_(3-x)for MoSe_(2)/MoO_(3-x)@rGO composites

作     者：Jiangshao Yang Liwen Liu Daoyi Wang Jianming Tao Yanming Yang Jiaxin Li Yingbin Lin Zhigao Huang Jiangshao Yang;Liwen Liu;Daoyi Wang;Jianming Tao;Yanming Yang;Jiaxin Li;Yingbin Lin;Zhigao Huang

作者机构：College of Physics and EnergyFujian Normal UniversityFuzhou 350117China Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research CenterFuzhou 350117China Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and EngineeringFuzhou 350117China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第115卷第20期

页      面：232-240页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：the Natural Science Foundations of China(Nos.12174057,22179020) Natural Science Foundation of Fuccccjian Province(No.2021L3011) Fujian Natural Science Foundation for Distinguished Young Scholars(No.2020J06042) 

主　　题：Potassium ion batteries MoSe_(2) Amorphous Work function Heterojunction interface 

摘      要：Promoting interfacial reaction kinetics is highly desirable for achieving high-performances of anode material in alkali-ion ***,flower-like MoSe_(2)/MoO_(3-x)@r GO composites are fabricated by a facile solvothermal method involving a thermal-treatment at 800°*** evaluated as an anode material for potassium ion batteries,MoSe_(2)/MoO_(3-x)@r GO delivers 248.2 m A h g^(-1)after 50 cycles at 0.2 A g^(-1) with a capacity retention of 84.6%and 182.9 m A h g^(-1)after 150 cycles at 1.0 A g^(-1) with a capacity retention of almost 61.2%,superior to those of bare MoSe_(2)or MoSe_(2)@r GO *** from electrochemical measurements,the amorphous MoO_(3-x)containing oxygen vacancies could not only effectively buffer the self-aggregation of MoSe_(2)nanosheets but also provides lots of accessible active sites for potassium ion ***,the open channels in the amorphous MoO_(3-x) phase lead to easier ion hopping and smaller diffusion ***,the built-in electric field at the interface would be beneficial for electron transfer and K-ion migration across the hetero-junction ***,larger dielectric polarization induced by the high relative permittivity of amorphous MoO_(3-x) would reduce charge transfer resistance and enhance K-ion migration across electric *** work provides new insight into the enhanced performance of anode material coated by an amorphous layer with large relative permittivity.