Spin-engineering with electrocatalysts have been exploited to suppress the“shuttle effect”in Li–S batteries.Spin selec-tion,spin-dependent electron mobility and spin potentials in activation barriers can be optimiz...Spin-engineering with electrocatalysts have been exploited to suppress the“shuttle effect”in Li–S batteries.Spin selec-tion,spin-dependent electron mobility and spin potentials in activation barriers can be optimized as quantum spin exchange interactions lead-ing to a significant reduction of the electronic repulsions in the orbitals of catalysts.Herein,we anchor the MgPc molecules on fluorinated carbon nanotubes(MgPc@FCNT),which exhibits the single active Mg sites with axial displacement.According to the density functional theory calculations,the electronic spin polarization in MgPc@FCNT not only increases the adsorption energy toward LiPSs intermediates but also facilitates the tunneling process of electron in Li–S batter-ies.As a result,the MgPc@FCNT provides an initial capacity of 6.1 mAh cm^(-2) even when the high sulfur loading is 4.5 mg cm^(-2),and still maintains 5.1 mAh cm^(-2) after 100 cycles.This work provides a new perspective to extend the main group single-atom catalysts enabling high-performance Li–S batteries.展开更多
A covalent organic frameworks(COFs)material with regular pores and stable structure can be used as the host of lithium-sulfur batteries to improve battery kinetics and polysulfides conversion.Herein,we designed and sy...A covalent organic frameworks(COFs)material with regular pores and stable structure can be used as the host of lithium-sulfur batteries to improve battery kinetics and polysulfides conversion.Herein,we designed and synthesized two kinds of rod-liked bulk COFs by adjusting different pore sizes(COF-BTD and COF-TFB),unfortunately,the active sites masking and sluggish kinetics have not met our expectations.Generally,the available layered COFs prepared from mechanochemical can expose abundant active sites and favorable kinetics than bulk COFs.Thus,simple mechanical ball milling is applied to activate the above COFs(M-COFs group).It is worth noting that layered R-COF-BTD is directly synthesized from rod-liked precursors by simple morphological reconstruction.A series of characterization methods are used to systematically explore the advantages of the group of M-COFs@S electrodes in the cycling process,including the effects of specific morphology on the kinetics and transformation of polysulfides.Our research provides a feasible plan for the development and selection of the host material of lithium-sulfur batteries.展开更多
当前，现代检验医学已步入了一个以自动化、信息化、网络化为主要特征的新时期。检验水平和检测手段日新月异，临床检验工作日趋自动化、规范化、信息化，因而建立一套功能强大的实验室信息系统（laboratory information system，LIS）...当前，现代检验医学已步入了一个以自动化、信息化、网络化为主要特征的新时期。检验水平和检测手段日新月异，临床检验工作日趋自动化、规范化、信息化，因而建立一套功能强大的实验室信息系统（laboratory information system，LIS）是现代临床实验室必不可少的。如今的LIS已不仅仅局限于标本管理、数据采集、报告打印等简单的功能，信息技术的发展、医疗体制改革的要求以及各种严格的行业规范，将LIS推向了前所未有的高度。展开更多
Metonymy is not only regarded as a figure of speech,but also an important cognitive instrument of human beings.There are many types of metonymies in Li Bai's poems.Metonymy can make the language vivid and reflect ...Metonymy is not only regarded as a figure of speech,but also an important cognitive instrument of human beings.There are many types of metonymies in Li Bai's poems.Metonymy can make the language vivid and reflect poet's mode of knowing and thinking about the world.This paper proposes five strategies for translation of metonymy in Li Bai's poems from the perspective of cognitive linguis tics.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(No.22109140,U22A20107)Henan Provincial Science and Technology R&D Program Joint Fund(222301420001)+4 种基金Distinguished Young Scholars Innovation Team of Zhengzhou University(No.32320275)Higher Education Teaching Reform Research and Practice Project of Henan Province(2021SJGLX093Y)China Postdoctoral Science Foundation(2022M722866)International Talent Cooperation Program in Henan Province(No.HNGD2022036)the Postdoctoral Science Foundation of Zhengzhou University(22120030).
文摘Spin-engineering with electrocatalysts have been exploited to suppress the“shuttle effect”in Li–S batteries.Spin selec-tion,spin-dependent electron mobility and spin potentials in activation barriers can be optimized as quantum spin exchange interactions lead-ing to a significant reduction of the electronic repulsions in the orbitals of catalysts.Herein,we anchor the MgPc molecules on fluorinated carbon nanotubes(MgPc@FCNT),which exhibits the single active Mg sites with axial displacement.According to the density functional theory calculations,the electronic spin polarization in MgPc@FCNT not only increases the adsorption energy toward LiPSs intermediates but also facilitates the tunneling process of electron in Li–S batter-ies.As a result,the MgPc@FCNT provides an initial capacity of 6.1 mAh cm^(-2) even when the high sulfur loading is 4.5 mg cm^(-2),and still maintains 5.1 mAh cm^(-2) after 100 cycles.This work provides a new perspective to extend the main group single-atom catalysts enabling high-performance Li–S batteries.
基金supported by the National Natural Science Foundation of China,China(No.81927809).
文摘A covalent organic frameworks(COFs)material with regular pores and stable structure can be used as the host of lithium-sulfur batteries to improve battery kinetics and polysulfides conversion.Herein,we designed and synthesized two kinds of rod-liked bulk COFs by adjusting different pore sizes(COF-BTD and COF-TFB),unfortunately,the active sites masking and sluggish kinetics have not met our expectations.Generally,the available layered COFs prepared from mechanochemical can expose abundant active sites and favorable kinetics than bulk COFs.Thus,simple mechanical ball milling is applied to activate the above COFs(M-COFs group).It is worth noting that layered R-COF-BTD is directly synthesized from rod-liked precursors by simple morphological reconstruction.A series of characterization methods are used to systematically explore the advantages of the group of M-COFs@S electrodes in the cycling process,including the effects of specific morphology on the kinetics and transformation of polysulfides.Our research provides a feasible plan for the development and selection of the host material of lithium-sulfur batteries.
文摘当前，现代检验医学已步入了一个以自动化、信息化、网络化为主要特征的新时期。检验水平和检测手段日新月异，临床检验工作日趋自动化、规范化、信息化，因而建立一套功能强大的实验室信息系统（laboratory information system，LIS）是现代临床实验室必不可少的。如今的LIS已不仅仅局限于标本管理、数据采集、报告打印等简单的功能，信息技术的发展、医疗体制改革的要求以及各种严格的行业规范，将LIS推向了前所未有的高度。
文摘Metonymy is not only regarded as a figure of speech,but also an important cognitive instrument of human beings.There are many types of metonymies in Li Bai's poems.Metonymy can make the language vivid and reflect poet's mode of knowing and thinking about the world.This paper proposes five strategies for translation of metonymy in Li Bai's poems from the perspective of cognitive linguis tics.
